Autoinhibition can reduce enzymatic activity by:
A. reducing the quantity of active enzyme in the cell.
B. preventing self-assembly of oligomer.
C. requiring a ligand for activity.
D. requiring an auxiliary protein for activity.
E. All of the choices given are true.
E
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Which of the following would not be used as a final electron acceptor in anaerobic respiration?
A) oxygen B) sulfur C) protons D) iron E) nitrogen
Which of the following statements about blood
cells in solutions is CORRECT?
a. A blood cell placed in an isotonic solution will swell. b. A blood cell placed in a hypotonic solution will swell. c. A blood cell placed in a hypotonic solution will shrink. d. A blood cell placed in an isotonic solution will shrink. e. A cell placed in a hypotonic solution will remain the same size.
If oxygen were present in the Earth's primitive atmosphere, then according to one hypothesis
A. the processes leading to the origin of life would occur. B. organic molecules could not form from inorganic molecules. C. reduction reactions would have been possible. D. None of these answers is correct.
The hydrogen bond between two water molecules forms because water is
A) hydrophobic. B) nonpolar. C) a large molecule. D) a small molecule. E) polar.