The humoral immune response differs from the cell-mediated immune response in that only in the humoral immune response is there
A. a precommitted lymphocyte.
B. secretion of antibody.
C. a clonal selection mechanism.
D. the development of memory cells.
Answer: B
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Kinetic proofreading allows an enzyme to discriminate between two substrates by:
A. using a binding pocket of a specific size. B. using a multistep reaction and energy to reverse reactions. C. using a binding pocket of a specific shape. D. increasing the rate of the single chemical step of the reaction.
Four of the following are true about the amoebozoans. Which one is the exception?
a. They are shape shifters. b. They include the amoebas. c. They are the closest known relatives of animals. d. They include species that are able to form pseudopods. e. They include the slime molds.
Why do all enzymatic reactions need activation energy?
a. Energy is required to disrupt a substrate's stable electron configuration. b. Energy allows only the substrate to bind. c. Energy is needed for the enzyme to find its substrate. d. Energy is required by an enzyme so that it can be reused.
The carcinogen known to cause the most cases and types of cancer is
A) X-rays. B) ultraviolet light. C) alcohol. D) tobacco.