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the food particle forming food vacuole. Inside the food vacuole, complex substances are broken down into simpler ones. Then diffuse into the cytoplasm. The remaining undigested material is moved to the surface of the cell and thrown out. In Paramoecium [fig-9(b)], which is also a unicellular organism the cell has a de... |
her without sufficient rest. Those who are able to relax, who are not continually tensed up, and who live at a slower pace, seldom get ulcers. You studied about recent researches in the peptic ulcers caused by some bacteria in class IX. Proper functioning of all life processess require adequate amount of food in all li... |
istribution by A.P. Government 21 21. What happens to plant if the rate of respiration becomes more than the rate of photosynthesis?(AS2) 22. Why do you think that carbohydrates are not digested in the stomach?(AS2) 23. What process you follow in your laboratory to study presence of starch in leaves?(AS3) 24. How would... |
tal set up to test the presence of Carbon dioxide in exhaled air). Arrange apparatus as shown in figure and try to do the experiment once again to find out what happens. lime water water • What does this experiment indicate? • Which gas turns lime water milky? • Which gas do you think might be present in greater quanti... |
apter ‘Respiration in Organisms’. Transportation of gases We know that air is a mixture of gases, that fills the lungs and the alveoli when that enters our body. The relative amount of different gases in air and their combining capacity with haemoglobin and other substances in blood determine their transport via blood ... |
ng energy when they are short of oxygen, what can cells of other living organisms do? Let us find out by doing some experiments. 36 X Class Respiration - The energy releasing system Lab Activity Some experiments with yeast To test this idea we can see whether it is possible to detect any rise in temperature and the pro... |
g much larger air spaces which connect the stems with the roots, making diffusion from the upper parts much more efficient. fig-16: Aerial roots The most usual adaptation is to have a hollow stem. Next time when you are by a pond or marsh cut the stems of some of the plants which are growing there and see how many are ... |
(because of pollution, tobacco) and discuss with your classmates.(AS4) 21. What is the pathway taken by air in the respiratory system? Illustrate with a labelled diagram.(AS5) 22. Draw a block diagram showing events in respiration. Write what you understood about cellular respiration.(AS5) Free distribution by A.P. Go... |
nar valve in the pulmonary artery left atrio vetricular value left ventricle inferior vena cava right ventricle fig-5: Internal structure of heart Now observe the internal structure. Observe the wall of the heart. Is the thickness of the wall of the heart uniform throughout? • • How many chambers are there in the heart... |
valves are found? What do you think is the function of the valves in them? • Why do sub-cutaneous blood vessels bulge on the side away from the heart when the hand is tied? • The deep seated blood vessels (the arteries) bulge on the side towards the heart when tied. What do you understand from it? • There are valves in... |
move the fluid and the transporting medium is blood. The Arthropods have developed a pulsatile organ to pump the blood, the heart. The blood instead of flowing in blood vessels floods the tissues, directly supplying the nutrients to the tissues. Oxygen is directly supplied to the tissues directly by the respiratory sys... |
through root and stem into the leaves. Here the water evaporates and releases into the atmosphere. The evaporation creates the main pull of water above root pressure which gives a variable and minor push from below. This results in a continuous column of moving water, the ‘transpiration stream’. Is there any relation b... |
n be named as____________. g) The valve that is present between right atrium and right ventricle can be named as ___________. 14. If the valves in veins of the legs fail to stop the flow of blood what could be the consequences of this failure?(AS2) 15. What will happen if cell sap of root hair cells contain high concen... |
REPORT ON URINE ANALYSIS TEST/METHOD RESULT 24 hrs.Protein 24 hrs Creatinine 24 hrs.Calcium 24hrs.phosphorous 24hrs.uric Acid ELECTROLYTES : Sodium potassium Osmolality (calculated) Glucose Chlorides Urea 90 2.7 305 0.8 800 140 50 180 65 128 35 UNITS mg/day mg/day mg/day mg/day mg/day mmol/L mmol/L mosm/L mg/dl mmol/L ... |
d by a ring of muscles or sphincter. Urethra is 4 cm long in females and about 20cm long in males. Its opening is separate in females but is in common with the reproductive tract in males (urino-genital duct). Micturition The urine is temporarily stored in the bladder. There are two sets of circular sphincter muscles i... |
o taste. Hence, herbivores usually do not prefer to eat such plants. Some of the chemicals are toxic and may even kill the animal that eats them. Think and discuss • Why weeds and wild plants are not affected by insects and pests? Some of the plants secrete chemicals when injured. These chemicals seal the wound and hel... |
nal tubule with neatly labled diagram.(AS5) 19. Draw a block diagram showing the path way of excretory system in human being.(AS5) 20. If you want to explain the process of filtration in kidney what diagram you need to draw.(AS5) 21. List out the things that makes you amazing in excretory system of human being.(AS6) 22... |
little known till late 18th century. Then, physiologists began to study the mechanism of nerve functioning and found how signals were transmitted by making the connection between recent work on electricity and the propositions on working of the nervous system made till then. Now we know more about how nerves from diffe... |
initiated by cerebrum. Midbrain Cerebellum Medulla oblongata i) Contains centre for cardiac, respiratory and vasomotor activities. (Vasomotor refers to actions upon a blood vessel which alter its diameter) ii) Coordinates reflexes like swallowing, coughing, sneezing and vomiting. Do you know ? The brain weighs approxim... |
n a frightening situation, getting anger or excited. • Have ever observed the duration of anger? • Why does anger come down? • What may happen if anger persists for a longer period? Anger is always short lived factor. You know that increased levels of adrenalin are responsible for anger. When the levels of adrenalin in... |
ng on flowers for this nectar. Ripen stigma secretes sugary substance. This chemical substance stimulates the pollen grain which falls on the stigma. Pollen grain responds to this stimulus as pollen tubes grow to reach the ovule for fertilization. This type of response to chemicals is called chemo tropism. Unequal dist... |
e whether curd has formed. Curdling indicates that the increase in number of bacteria. Note the time taken for formation of curd in both the bowls. • Does it take the same time to form curd in both the bowls? • What is the time taken to form nearly 30 times the size of the bacterial colony indicate? Think, how fast the... |
low power. The common bread mould consists of fine thread like projections called hyphae and thin knob like structures called Sporangia (sporangium in singular). Each sporangium contains hundreds of minute spores. When the sporangium bursts, the tiny spores are dispersed in air. Try to give some more examples of organ... |
nta amnoin cervix baby fluid fig-17: Shortly before birth 126 X Class Reproduction - The generating system Do you know? Need for sexual reproduction Asexual reproduction as we have studied produce organisms which are normally copies of the single parent. Sexual reproduction would require two parents and organism produc... |
rm which provides food to the baby plant. This is called double fertilization. Cell division and continuation of life Continuation of life starts from cells either those of the general body or the sex cells (gametes). Virchow (1821–1902) a proponent of cell theory is given the credit for the phrase Omnis cellula de cel... |
. • What differences do you find in mitosis and meiosis? Write in a tabular form. • What would happen if the gamets do not have half the chromosome number as the skin parent? • How would it affect the progeny formed by sexual reproduction? Reproductive health • Why did the government of India fixed the legal marriage a... |
ion of sex before birth is illegal. • Stop female foeticide. Improve your learning 1. Why do fish and frog produce a huge number of eggs each year?(AS1) 2. Give examples and explain what is meant by external fertilisation?(AS1) 3. Write differences between.(AS1) a) asexual reproduction - sexual reproduction b) stamen-c... |
smell are closely related Taste and smell are intimately entwined. This close relationship is most apparent in how we perceive the flavors of food. Anyone with severe cough and cold can not make out the difference in tastes of certain food items. Actually, what is really being affected is the flavor of the food, or the... |
wing, food forms into a slurry mass called ‘bolus’ that is transported into the oesophagus by the action of swallowing with the help of the tongue. The enzyme salivary amylase in the saliva breaks down the large starch molecule into smaller subunits usually into sugars. The mechanism for swallowing is also under nervou... |
e stomach protected from the secretions of its own acids. To understand this we will perform the following experiment. Lab Activity Take two similar green leaves. Grease one leaf with petroleum jelly leave the other free. Add 1 or 2 drops of some weak acid on both the leaves .Observe them after half an hour or so and w... |
ction to our mouth from harmful bacteria etc., Under the action of autonomous nervous system Saliva released by the salivary glands moistens the food to make chewing and swallowing easier. • The muscular and sensory organ in the oral cavity is the tongue which is not only gustatory in function but also performs differe... |
eaumonts experiments revolutioned the concepts of digestion. June -on16,1822 became the beginning for the the most pioneering experiments in medicine. He recounted many of his observations and experiments in his journal which says “I consider myself but a humble experimentor “ in which the information provided still ob... |
that the traits shown by the pea plants must be in the seeds that produced them. The seeds must have obtained these traits from the parent plants. How do parent plants pass on their traits to the seeds? Will the seeds from tall plants always produce new tall plants? Mendel carried out several experiments to find out an... |
r in the 1 on the chart. Keep picking out the strips and arrange them in the same manner till your bags are empty. Sametime your boxes in the chart are filled with pairs of strips. You might have got the following combinations, two long strips, one long and one short strip, two short strips. • What is the number of lon... |
itance of acquired characters’. For example elongation of neck and forelimbs in giraffe. But Augustus Weismann, tested this theory by an experiment on rats. He removed tails of parental rats. He observed that their offspring’s are normal with tails. He has done it again and again for twenty two generations but still of... |
ural features of their ancestors? This strengthens the view of the existence of a common ancestor from which all these have evolved. Pig Calf Human Rabbit fish Salamander Tortoise Chick fig-14: Embryological evidences Evidences from fossils We know some species which existed million years ago, but we may not find them ... |
structure of the limbs is similar, though it has been modified to perform different functions. 21. Collect information about carbon dating method. Discuss with your physical science teacher.(AS4) 190 X Class Heredity - From parent to progeny 22. Draw a checker board show the law of independent assortment with a flow ch... |
ig-2: Food relationships Ecological pyramids Apart from the food chains pyramids are another type of representations which show flow of energy from one organism to another. You may have heard about pyramids of Egypt. The ecologists also used this idea of pyramid to show relationship among organisms in an existing Free ... |
higher trophic level in the ecosystem. Solar energy Producers (Chemical energy) Consumers (Chemical energy) Heat Heat The materials keep on cycling i.e. entering the living beings and through death and decay returning to the soil and atmosphere Such a flow of materials between organisms and their environment is called... |
upsetting the balance within the ecosystem. A further danger is that some have a cumulative effect. Pesticides vary in their length of “life” as toxic substances. Some of the pesticides as well as herbicides are degradable. They are broken down into harmless substances in a comparatively short time, usually a year. Oth... |
trolling the pests that effect the crops we vitally need for our growing population? The long term solution to this problem is to find other effective methods of controlling pests which have far less harmful effects and are based on sound biological principles. Here are some of the important methods used. Rotation of c... |
village do you think is more affected? • What is the change in types of crops grown in the villages? Of late, most of the open dug wells were converted into bore wells that could reach greater depths of ground water zones and would also reduce loss of water by surface evaporation.Most of the open wells have dried up an... |
ted in this manner. Wasteland development and tree plantation Saplings of useful species were planted along the roads, field bunds and nalas. Contour trenches at 10 m intervals with a 0.3 m height of bund were laid out. Custard apple plantation along with other useful species in trenches and Gliricidia saplings on bund... |
ng materials, and medicines, as well as to maintain a clean and healthy landscape. When a species becomes extinct, it is lost to the world forever. Scientists estimate that the current rate of extinction is 1,000 times the natural rate. Through hunting, pollution, habitat destruction, people are speeding up the loss of... |
akulam): People of more than 20 villages in two mandals of Srikakulamhave raised a banner of revolt against the proposed beach sand mining project by a private company and threatened to intensify their agitation if the government does not cancel the project. The sand mining is being taken up to extract rich minerals fr... |
Community College Robert Wise, The University of Wisconsin Oshkosh Vladimir Jurukovski, Suffolk County Community College Jean DeSaix, The University of North Carolina at Chapel Hill Jung Choi, Georgia Institute of Technology Yael Avissar, Rhode Island College Curriculum Framework for AP® Biology Big Idea 1: The proces... |
cooperation are important aspects of biological systems. 3.2, 3.3, 6.2, 6.3, 6.6, 7.5, 7.6, 8.2, 10.3, 18.1, 23.1, 22.4, 45.2, 45.6, 46.2, 47.3 Chapter/Key Concepts 4.B.1. Interactions between molecules affect their structure and function. 3.5, 5.2, 6.2, 6.5, 8.3 4.B.2. Cooperative interactions within organisms promot... |
related to the physical world and its phenomena and processes are considered natural sciences. Thus, a museum of natural sciences might contain any of the items listed above. 12 Chapter 1 | The Study of Life Figure 1.4 The diversity of scientific fields includes astronomy, biology, computer science, geology, logic, ph... |
mber of specific observations. This type of reasoning is called inductive reasoning, and it proceeds from the particular to the general. Inductive and deductive reasoning are often used in tandem to advance scientific knowledge (see this figure) Think About It Almost all plants use water, carbon dioxide, and energy fro... |
roposal is original, significant, logical, and thorough. Grant proposals, which are requests for research funding, are also subject to peer review. Scientists publish their work so other scientists can reproduce their experiments under similar or different conditions to expand on the findings. The experimental results ... |
s respond to diverse stimuli. For example, plants can bend toward a source of light, climb on fences and walls, or respond to touch (Figure 1.11). Even tiny bacteria can move toward or away from chemicals (a process called chemotaxis) or light (phototaxis). Movement toward a stimulus is considered a positive response, ... |
gure 1.16 The biological levels of organization of living things are shown. From a single organelle to the entire biosphere, living organisms are parts of a highly structured hierarchy. (credit “organelles”: modification of work by Umberto Salvagnin; credit “cells”: modification of work by Bruce Wetzel, Harry Schaefer/... |
hat aims to solve real-world problems atom smallest and most fundamental unit of matter basic science knowledge science that seeks to expand knowledge and understanding regardless of the short-term application of that biochemistry study of the chemistry of biological organisms biology the study of living organisms and ... |
IONS 12. Is mathematics a natural science? Explain your reasoning. a. No, it is not a natural science because it is not used in the study of the natural world. b. No, it is not a natural science. Mathematics focuses on understanding mathematical relations and calculations, which is useful in natural sciences but which ... |
are different forms of an element that have different numbers of neutrons while retaining the same number of protons; many isotopes, such as carbon-14, are radioactive. The information presented and examples highlighted in this section support concepts and Learning Objectives outlined in Big Idea 2 of the AP® Biology C... |
s a living organism incorporates 14C initially as carbon dioxide fixed in the process of photosynthesis, the relative amount of 14C in its body is equal to the concentration of 14C in the atmosphere. When an organism dies, it is no longer ingesting 14C, so the ratio between 14C and 12C will decline as 14C decays gradua... |
lls. That means that they can achieve a stable configuration and a filled outer shell by donating or sharing one electron with another atom or a molecule such as water. Hydrogen will donate or share its electron to achieve this configuration, while lithium and sodium will donate their electron to become stable. As a re... |
ction until the reactants are all used up. The equations that describe these reactions contain a unidirectional arrow and are irreversible. Reversible reactions are those that can go in either direction. In reversible reactions, reactants are turned into products, but when the concentration of product goes beyond a cer... |
f Life 57 nonpolar bonds form. The hydrogen atoms each need one electron for their outermost shell, which is filled when it contains two electrons. These elements share the electrons equally among the carbons and the hydrogen atoms, creating a nonpolar covalent molecule. Figure 2.12 Whether a molecule is polar or nonpo... |
on other planets? Why is water so important? It is because water is essential to life as we know it. Water is one of the more abundant molecules and the one most critical to life on Earth. Approximately 60–70 percent of the human body is made up of water. Without it, life as we know it simply would not exist. The polar... |
bonds are disrupted in the process of dissociation. Dissociation occurs when atoms or groups of atoms break off from molecules and form ions. Consider table salt (NaCl, or sodium chloride): when NaCl crystals are added to water, the molecules of NaCl dissociate into Na+ and Cl– ions, and spheres of hydration form aroun... |
required for survival. Maintaining a constant blood pH is critical to a person’s –), and well-being. The buffer maintaining the pH of human blood involves carbonic acid (H2CO3), bicarbonate ion (HCO3 carbon dioxide (CO2). When bicarbonate ions combine with free hydrogen ions and become carbonic acid, hydrogen ions are... |
amino acids and cholesterol and its derivatives, including the hormones estrogen and testosterone. The benzene ring is also found in the herbicide 2,4-D. Benzene is a natural component of crude oil and has been classified as a carcinogen. Some hydrocarbons have both aliphatic and aromatic portions; beta-carotene is an ... |
rent elements covalent bond type of strong bond formed between two atoms of the same or different elements; forms when electrons are shared between atoms dissociation release of an ion from a molecule such that the original molecule now consists of an ion and the charged remains of the original, such as when water diss... |
ostatic forces. d. Ionic bonds are generally stronger than covalent bonds. Based on the information provided, which of the following statements is false? 80 Chapter 2 | The Chemical Foundation of Life a. b. c. d. , the nitrogen atom acquires a partial In NH2 positive charge and the hydrogen atoms acquire a partial nega... |
ture. d. Saturated triglycerides contain double bonds and are liquids at room temperature, while unsaturated triglycerides contain single bond and are solids at room temperature. a. adhesive properties b. surface tension c. heat of vaporization d. specific heat capacity This OpenStax book is available for free at http:... |
er than other types of grains. The full research review can be found here (http://openstaxcollege.org/l/32wholegrain) . 88 Chapter 3 | Biological Macromolecules 3.1 | Synthesis of Biological Macromolecules In this section, you will explore the following questions: • How are complex macromolecule polymers synthesized fr... |
and AP® Exam questions. A Learning Objective merges required content with one or more of the seven Science Practices. Big Idea 4 Enduring Understanding 4.A Biological systems interact, and these systems and their interactions possess complex properties. Interactions within biological systems lead to complex properties... |
anched polysaccharide (α 1-6 linkages at the branch points). This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 3 | Biological Macromolecules 99 Figure 3.10 Amylose and amylopectin are two different forms of starch. Amylose is composed of unbranched chains of glucose monomers connec... |
lycerides and phospholipids, steroids are classified as lipids based on their hydrophobic properties. Cholesterol is a type of steroid in animal cells’ plasma membrane. Cholesterol is also the precursor of steroid hormones such as testosterone. Information presented and the examples highlighted in the section, support ... |
n, trout, and tuna are good sources of omega-3 fatty acids. Research indicates that omega-3 fatty acids reduce the risk of sudden death from heart attacks, reduce triglycerides in the blood, lower blood pressure, and prevent thrombosis by inhibiting blood clotting. They also reduce inflammation, and may help reduce the... |
Challenge Questions contain additional test questions for this section that will help you prepare for the AP exam. These questions address the following standards: [APLO 1.14] [APLO 2.12] [APLO 4.1] [APLO 4.3][APLO 4.15][APLO 4.22] Types and Functions of Proteins Proteins are one of the most abundant organic molecules... |
sequence of cytochrome c from rhesus monkeys differs from the human sequence by one amino acid. What do these comparisons suggest? a. Rhesus monkeys are more closely related to humans than chimpanzees. b. Chimpanzees are more closely related to rhesus monkeys than to humans. c. Humans are related to chimpanzees, but a... |
additional perspective on proteins, view this animation (http://openstaxcollege.org/l/proteins) called “Biomolecules: The Proteins.” Vegans are people who do not consume any animal products in their diet. Why do vegans need to pay special attention to the protein they eat? a. Plant proteins contain all of the essential... |
ymine, and uracil are classified as pyrimidines which have a single carbon-nitrogen ring as their primary structure (Figure 3.33). Each of these basic carbon-nitrogen rings has different functional groups attached to it. In molecular biology shorthand, the nitrogenous bases are simply known by their symbols A, T, G, C,... |
ule that carries the hereditary information of the cell disaccharide two sugar monomers that are linked together by a glycosidic bond enzyme catalyst in a biochemical reaction that is usually a complex or conjugated protein glycogen storage carbohydrate in animals glycosidic bond molecule bond formed by a dehydration r... |
us base, and a phosphate group. RNA is involved in protein synthesis and its regulation. Messenger This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 3 | Biological Macromolecules 133 RNA (mRNA) is copied from the DNA, is exported from the nucleus to the cytoplasm, and contains info... |
e phosphatidic acid 3. phospholipids like oleic acid 4. 1. steroid like epinephrine lipids like phosphatidic acid 2. waxes like margarine 3. phospholipids like phosphatidylcholine 4. 1. steroids like testosterone lipids like cholesterol 2. waxes like the coating on feathers 3. phospholipids like phosphatidylserine 4. s... |
ing it more rigid than starch. d. Starch has amylose and amylopectin that make it more rigid than cellulose. b. a hydrolysis reaction producing fructose and water c. a condensation reaction producing lactose and water d. a dehydration reaction producing sucrose and water 66. The fatty acids of triglycerides are classif... |
HOL 15 POPC Water Table 3.3 55 45 30 30 65 60 110 95 100 155 280 55 65 75 B. Represent these data graphically. The axes should be labeled, and different symbols should be used to plot data for each material. C. Analyze the data by comparing transport of oxygen through the biological membrane, water, and the synthetic m... |
the organs and body cavities within. Bone cells help to support and protect the body. Immune system cells fight invading pathogens. Additionally, blood cells carry nutrients and oxygen throughout the body while removing carbon dioxide and other waste. Each of these cell types plays a vital role during the growth, deve... |
n sooner, which usually increases the chances of a successful outcome. Figure 4.4 These uterine cervix cells, viewed through a light microscope, were obtained from a Pap smear. Normal cells are on the left. The cells on the right are infected with human papillomavirus (HPV). Notice that the infected cells are larger; a... |
πr3/3. Thus, as the radius of a cell increases, its surface area increases as the square of its radius, but its volume increases as the cube of its radius (much more rapidly). Therefore, as a cell increases in size, its surface area-to-volume ratio decreases. This same principle would apply if the cell had the shape of... |
unded by a membrane, it is often said to have a “true nucleus.” The word “organelle” means “little organ,” and, as already mentioned, organelles have specialized cellular functions, just as the organs of your body have specialized functions. At this point, it should be clear to you that eukaryotic cells have a more com... |
aph shows a mitochondrion as viewed with a transmission electron microscope. This organelle has an outer membrane and an inner membrane. The inner membrane contains folds, called cristae, which increase its surface area. The space between the two membranes is called the intermembrane space, and the space inside the inn... |
dents in the class for review and revision. • Mystery Cell ID. Using a microscope, identify several types of cells, e.g., prokaryote/eukaryote, plant/ animal, based on general features and justify your identification. • Ten-Minute Debate. Working in small teams, create a visual representation to support the claim that ... |
, for example. Smooth ER The smooth endoplasmic reticulum (SER) is continuous with the RER but has few or no ribosomes on its cytoplasmic surface (Figure 4.18). Functions of the SER include synthesis of carbohydrates, lipids, and steroid hormones; detoxification of medications and poisons; and storage of calcium ions. ... |
ular movement, anchors the nucleus and other organelles in place, moves vesicles through the cell, and pulls replicated chromosomes to the poles of a dividing cell. These protein elements are also integral to the movement of centrioles, flagella, and cilia. The information presented and the examples highlighted in the ... |
Yes Yes No No Yes Yes Yes Yes Yes Yes Yes No No Yes, primarily cellulose Yes Yes 178 Chapter 4 | Cell Structure Components of Prokaryotic and Eukaryotic Cells Cell Component Function Present in Prokaryotes? Golgi apparatus Modifies, sorts, tags, packages, and distributes lipids and proteins Cytoskeleton Maintains cell’... |
cells do not have either of these structures. This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 4 | Cell Structure 183 KEY TERMS cell theory see unified cell theory cell wall rigid cell covering made of various molecules that protects the cell, provides structural support, and give... |
icrofilaments (actin filaments), intermediate filaments, and microtubules. Microfilaments are often associated with myosin. They provide rigidity and shape to the cell and facilitate cellular movements. Intermediate filaments bear tension and anchor the nucleus and other organelles in place. Microtubules help the cell ... |
mission microscope. b. A light microscope allows visualization of small living cells, which have been stained and cannot be viewed by scanning electron microscope. c. A standard light microscope is used to view living organisms with little contrast to distinguish them from the background, which would be harder to see w... |
ganelles would be present in high numbers in the leg muscles of a marathon runner? a. centrioles b. chloroplasts c. mitochondria d. peroxisome 53. Macrophages ingest and digest many pathogens. Which organelle plays a major role in the activity of macrophages? a. chloroplast b. lysosome c. nucleus d. peroxisome 54. You ... |
, the Ebola virus cannot infect a mouse. If this pattern also 196 Chapter 5 | Structure and Function of Plasma Membranes exists in humans, it means that anyone with NPC Disease and its subsequent problem with high cholesterol may also be protected from Ebola. The complete research report can be found here (http://opens... |
group), which has a polar character or negative charge, and an area called the tail (the fatty acids), which has no charge. The head can form hydrogen bonds, but the tail cannot. A molecule with this arrangement of a positively or negatively charged area and an uncharged, or non-polar, area is referred to as amphiphili... |
Many organisms (fish are one example) are capable of adapting to cold environments by changing the proportion of unsaturated fatty acids in their membranes in response to the lowering of the temperature. Visit this site (http://openstaxcollege.org/l/biological_memb) to see animations of the fluidity and mosaic quality ... |
ds or proteins, are also found on the exterior surface of the plasma membrane. These carbohydrate complexes help the cell bind substances that the cell needs in the extracellular fluid. This adds considerably to the selective nature of plasma membranes (Figure 5.7). Figure 5.7 The exterior surface of the plasma membran... |
ns, resulting in the facilitation of electrical transmission along membranes (in the case of nerve cells) or in muscle contraction (in the case of muscle cells). Carrier Proteins Another type of protein embedded in the plasma membrane is a carrier protein. This aptly named protein binds a substance and, in doing so, tr... |
this site (http://openstaxcollege.org/l/dispersion) . Explain the difference between the two beakers (http://openstaxcollege.org/l/dispersion) . a. The lower temperature of left beaker causes yellow dye to diffuse faster than the right beaker. b. The lower temperature in left beaker causes yellow dye to diffuse slower ... |
elements such as potassium. The electrical gradient of K+, a positive ion, also tends to drive it into the cell, but the concentration gradient of K+ tends to drive K+ out of the cell (Figure 5.16). The combined gradient of concentration and electrical charge that affects an ion is called its electrochemical gradient. ... |
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