Enzymes function to:
A. react with other enzymes to form a product.
B. catalyze chemical reactions.
C. transport molecules and ions across membranes.
D. regulate messages between cells.
B
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When the frequency of nerve impulses slows or stops even when the stimulus continues at constant
strength, the individual has undergone a. sensory adaptation. b. tolerance. c. perceptive degradation. d. nerve damage. e. tachyphylaxis.
A benefit of global warming includes
a. farming in areas that were too cold in the past. b. more open shipping channels in the Arctic. c. commercial fishing in the Arctic ocean. d. milder winters in regions far to the north. e. all of these.
Thalassemias are associated with a(n) ____
a. amino acid substitution b. extended chain in beta globin c. imbalance in the production of alpha or beta globin d. excessive synthesis of beta globin e. altered rate of oxygen transport
In bacteria, the first amino acid inserted into a polypeptide as translation is initiated is?
a. formyl-methionine b. methionine or formyl-methionine c. methionine d. alanine