Question: Which factors affect the rate of osmotic movement of water? The rate of osmosis increases with increasing differences in solute concentrations between two solutions separated by a selectively permeable membrane.Hydrostatic pressure applied to a hypertonic solution separated from a hypotonic solution by a selectively permeable membrane increases osmotic movement across the membrane.No factors have an effect; the rate of osmosis is constant.

Answer: ...

Question: Select the correct statement about osmosis. If a dead cell is placed in a solution hypotonic to the cell contents, osmosis will not occur.Osmosis is the diffusion of water molecules across a selectively permeable membrane.Osmotic equilibrium cannot be reached unless solute concentrations equalize across the membrane.

Answer: Osmosis is the diffusion of water molecules across a selectively permeable membrane.

Question: What will happen to a red blood cell (RBC), which has an internal ion concentration of about 0.9 percent, if it is placed into a beaker of pure water?The cell would shrink because the water in the beaker is hypertonic relative to the cytoplasm of the RBC.The cell would shrink because the water in the beaker is hypotonic relative to the cytoplasm of the RBCThe cell will remain the same size because the solution outside the cell is isotonic.The cell would swell because the water in the beaker is hypotonic relative to the cytoplasm of the RBC.

Answer: The cell would swell because the water in the beaker is hypotonic relative to the cytoplasm of the RBC

Question: Question 4When a cell is in equilibrium with its environment, which of the following occurs for substances that can diffuse through the cell? All movement of molecules is directed by active transport. There is no movement of substances into and out of the cell.There is random movement of substances into and out of the cellThere is directed movement of substances into and out of the cell.

Answer: There is random movement of substances into and out of the cell

Question: Which of the following most accurately describes selective permeability?Lipid-soluble molecules pass through a membrane.An input of energy is required for transport.There must be a concentration gradient for molecules to pass through a membrane.Only certain molecules can cross a cell membrane.

Answer: Only certain molecules can cross a cell membrane

Question: The binding of a compound to an enzyme is observed to slow down or stop the rate of the reaction catalyzed by the enzyme. Increasing the substrate concentration reduces the inhibitory effects of this compound. Which of the following could account for this observation? The compound reduces disulfide bonds, causing the enzyme molecules to partially unfold.The compound is a competitive inhibitor.The compound forms a covalent bond with one of the amino acid residues needed for enzyme activity.The compound causes a cofactor to be lost from the enzyme.

Answer: The compound is a competitive inhibitor

Question: Which of the following is NOT a way in which an enzyme can speed up the reaction that it catalyzes? The active site can provide heat from the environment that raises the energy content of the substrateThe active site of the enzyme can provide a microenvironment with a different pH that facilitates the reaction.The binding of two substrates in the active site provides the correct orientation for them to react to form a product.Binding of the substrate to the active site can stretch bonds in the substrate that need to be broken.

Answer: The active site of the enzyme can provide a microenvironment with a different pH that facilitates the reaction

Question: Some bacteria are metabolically active in hot springs because high temperatures make catalysis unnecessary.their enzymes have high optimal temperatures.they use molecules other than proteins or RNAs as their main catalysts.

Answer: their enzymes have high optimal temperatures

Question: The active site of an enzyme is the region that _____. is inhibited by the presence of a coenzyme or a cofactorbinds allosteric regulators of the enzymebinds noncompetitive inhibitors of the enzymeis involved in the catalytic reaction of the enzyme

Answer: is involved in the catalytic reaction of the enzyme

Question: Anabolism process is referred to as ______ while catabolism is known as _____ build up ......break downspontaneous reaction ......non-spontaneous reactionbreak down.....build upexergonic process......endergonic process

Answer: build up ......break down

Question: Which of the following best describes the main purpose of the combined processes of glycolysis and cellular respiration producing complex molecules from chemical building blocksbreaking down ATP, so that ADP and P can be reusedtransforming the energy in glucose and related molecules in a chemical form that cells can use for workcatabolism of sugars and related compound

Answer: transforming the energy in glucose and related molecules in a chemical form that cells can use for work

Question: In cellular respiration, a series of molecules forming an electron transport chain alternately accepts and then donates electrons. What is the advantage of such an electron transport chain none of the aboveThe advantage of an electron transport chain is the production of a large number of reduced, high-energy intermediatesThe advantage of an electron transport chain is that a small amount of energy is released with the transfer of an electron between each pair of intermediatesThe advantage of the respiratory electron transport chain is that oxygen is the final electron acceptor

Answer: The advantage of an electron transport chain is that a small amount of energy is released with the transfer of an electron between each pair of intermediates

Question: Which of the following statements accurately describes the function of a metabolic pathway involved in cellular respiration The function of the bonding of acetic acid to the carrier molecule CoA to form acetyl CoA is the reduction of glucose to acetyl CoA.The function of glycolysis is to begin catabolism by breaking glucose into two molecules of pyruvate, with a net yield of two ATP.The function of the citric acid cycle is the transfer of electrons from pyruvate to NADH to O2.

Answer: The function of glycolysis is to begin catabolism by breaking glucose into two molecules of pyruvate, with a net yield of two ATP