Cell Biology Questions
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If the environment surrounding a cell has a lower concentration of solute than the cells cytoplasm then A. the environment is isotonic to the cell. B. the environment is hypertonic to the cell. C. the cell will not experience a net gain or loss of water. D. the environment is hypotonic to the cell. E. the cell will crenate.
Enzymes speed up reactions by A. increasing the amount of substrate molecules. B. competitive inhibition. C. increasing cellular temperature. D. lowering the activation energy of a reaction. E. All answers are correct.
Simple diffusion A. requires ATP. B. utilizes proteins to move molecules across a membrane. C. moves molecules against a concentration gradient. D. cannot occur without a membrane present. E. does not require ATP.
The molecule (molecules) that fits into the active site of an enzyme and reacts with the enzyme is A. always a protein. B. an analog. C. always a carbohydrate. D. a substrate. E. always broken down by the enzyme.
The diffusion of water across a selectively permeable membrane is A. facilitated diffusion. B. active transport. C. a rare occurrence. D. osmosis. E. always beneficial to a cell.
Oxidation means A. the gain of oxygen by a cell. B. the loss of electrons from an atom or molecule. C. the loss of oxygen from a cell. D. the gain of electrons by an atom or molecule. E. the loss of protons by an atom or molecule.
Competitive inhibition of enzymes A. occurs when a substance other than the correct substrate binds at the active site of an enzyme. B. occurs when a substance binds to an enzyme at a site away from the active site. C. occurs by denaturation of an enzyme. D. occurs by blocking the production of an enzyme. E. occurs when two enzymes bind together.
Enzymes speed chemical reactions by A. lowering the amount of reactants that are needed. B. maintaining temperature. C. lowering the energy required to start a chemical reaction. D. raising the temperature of the surroundings. E. supplying energy to the reaction process.
The breakdown of glucose to carbon dioxide and water is A. a endergonic reaction in photosynthesis. B. an endergonic reaction in cellular respiration. C. an exergonic reaction in photosynthesis. D. an exergonic reaction in cellular respiration. E. None of the answers are correct.
Oxidation-reduction reactions A. transfer electrons from one molecule to another. B. are not used by living cells. C. transfer protons from one molecule to another. D. reduce the amount of oxygen in the cell. E. increase the amount of oxygen in the cell.
The energy source that powers photosynthesis is A. water. B. glucose. C. carbon dioxide. D. sunlight. E. oxygen.
Oxidation-reduction reactions A. never occur at the same time. B. remove electrons from both molecules involved. C. remove protons from one molecule and join them to another molecule. D. occur simultaneously. E. remove oxygen from the cell.
Coupled reactions A. are reactions in which an exergonic reaction drives an endergonic reaction. B. are reactions in which a exergonic reaction drives a spontaneous reaction. C. are reactions in which a endergonic reaction drives an exergonic reaction. D. are reactions in which a endergonic reaction drives a spontaneous reaction. E. are reactions in which an enzyme is used.
Reduction means A. the gain of oxygen by a cell. B. the loss of oxygen from a cell. C. the gain of electrons by an atom or molecule. D. the loss of electrons by an atom or molecule. E. the loss of protons by an atom or molecule.
Which of the following is NOT an example of kinetic energy? A. heat B. light C. sound D. the energy in chemical bonds E. random molecular movement
The amount of energy required to raise the temperature of one kilogram of water by one degree Celsius is a A. calorie. B. joule. C. kilocalorie. D. measure of density. E. measure of light.
Entropy is A. order. B. complexity. C. disorder. D. Both order and disorder are correct. E. Both complexity and disorder are correct.
The reactants of photosynthesis are A. water and carbon dioxide. B. organic compounds. C. glucose and water. D. glucose and carbon dioxide. E. glucose and sunlight.
Cells use energy for which of the following? A. to do work B. to synthesize proteins C. to expel waste D. to move substances across membranes E. All answers are correct
Enzymes A. slow reactions so they occur correctly. B. are not necessary to sustain life in a cell. C. are not found in living organisms. D. are proteins in most cases. E. are carbohydrates in most cases.