B confined to the hydrophobic interior of the membrane. E It has few, if any, hydrophobic amino acids. The presence of cholesterol in the plasma membranes of some animals A enables the membrane to stay fluid more easily when cell temperature drops. Which of the following would you expect to be a problem for someone with nonfunctional chloride channeling? E A substance that blocked sodium ions from binding to the cotransport protein would also block the transport of glucose. The internal solute concentration of a plant cell is about 0. Active transport requires a cell to expend energy. You are working on a team that is designing a new drug.
Facilitated diffusion involves transport proteins and active transport does not. B pinocytosis increases the surface area of the plasma membrane whereas receptor-mediated endocytosis decreases the plasma membrane surface area. A The double bonds form kinks in the fatty acid tails, forcing adjacent lipids to be further apart. The primary function of polysaccharides attached to the glycoproteins and glycolipids of animal cell membranes is A to facilitate diffusion of molecules down their concentration gradients. C by ribosomes bound to the rough endoplasmic reticulum. A antiviral medications that are efficient and work well with all viruses B antibiotics against the viruses in question C intravenous feeding techniques D medication to prevent blood loss E hydrating drinks that include high concentrations of salts and glucose Familial hypercholesterolemia is characterized by which of the following? E have higher rates of lateral diffusion of lipids and proteins into and out of the lipid rafts.
A Cell membranes have stopped evolving now that they are fluid mosaics. Facilitated diffusion requires energy to drive a concentration gradient. B Proteins rarely move, even though they possibly can do so. Water enters the sucrose solution because the sucrose molecule is a disaccharide and thus larger than the monosaccharide glucose. A transporting ions against an electrochemical gradient B cell-cell recognition C maintaining fluidity of the phospholipid bilayer D attaching to the cytoskeleton E establishing the diffusion barrier to charged molecules In the years since the proposal of the fluid mosaic model of the cell membrane, which of the following observations has been added to the model? One hypothesis is that the volume of this airway surface liquid is regulated osmotically by transport of sodium and chloride ions across the epithelial cell membrane. Active transport involves transport proteins and facilitated diffusion does not.
E It has few, if any, hydrophobic amino acids. Bacterial cell walls are shrivelled up by salt, causing the cell to burst. E They consume energy to decrease the entropy of the organism and its environment. Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold? D It works against diffusion. D There are only weak hydrophobic interactions in the interior of the membrane. D a decrease in the concentration of NaCl and a decrease in the water level. D It is an active process in which molecules move from a region of lower concentration to one of higher concentration.
Hypercholesterolemia is a disease induced by a faulty diet. B pinocytosis increases the surface area of the plasma membrane whereas receptor-mediated endocytosis decreases the plasma membrane surface area. C It requires the expenditure of cellular energy to function. D The water level is unchanged. C The patientʹs red blood cells will swell because the blood fluid is hypotonic compared to the cells.
C It is taken to the liver and converted back to pyruvate. After phosphorylation and reduction produces glyceraldehyde 3-phosphate G3P , what more needs to happen to complete the Calvin cycle? Which of the following statements best represents the relationships between the light reactions and the Calvin cycle? The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold? The mosaic comprises the carbohydrate chains on the inner surface of the membrane. Passive transport operates independently of diffusion. C Sodium ion transport will decrease; lower osmotic potential will decrease airway surface liquid volume. D Cells with proton pumps were maintained in each Kingdom by natural selection.
B are more rigid than the surrounding membrane. E The movement of chloride ions and water molecules will not be affected by changes in sodium ion concentration outside the cell. Proton pumps are used in various ways by members of every domain of organisms: Bacteria, Archaea, and Eukarya. B the relationship between wavelengths of light and the rate of aerobic respiration. Active transport often involves the passage of two different solutes across a membrane in opposite directions. The best explanation for this is that A the integral membrane proteins are not strong enough to hold the bilayer together. When combined with a protein, they form a glycolipid.
D The water level is unchanged. Which of the following is a most likely explanation? Why is glycolysis described as having an investment phase and a payoff phase? When biological membranes are frozen and then fractured, they tend to break along the middle of the bilayer. Phosphate transport is an example of A passive diffusion. Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold? The sucrose solution is hypertonic and will gain water because the total mass of sucrose is greater than that of glucose. B It requires an expenditure of energy by the cell. B will almost always destroy the activity of the enzyme. A It will have no unfavorable effect as long as the water is free of viruses and bacteria.
B Cell membranes communicate signals from one organism to another. B water that is present in the middle of the bilayer freezes and is easily fractured. He added aerobic bacteria and then noted in which areas the bacteria congregated. B Unsaturated fatty acids have a higher cholesterol content and therefore more cholesterol in membranes. D It serves as a data point among results. B membranes are a phospholipid bilayer between two layers of hydrophilic proteins. E starch hydrolysis is nonspontaneous.