A ____ mechanism controls body temperature in the human body by reversing the body's attempt to generate heat
when body temperature rises.
a. positive feedback
b. inhibition
c. negative feedback
d. cyclical feedback
e. none of these
ANSWER: c
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Which of the following types of inhibitor permanently alters the enzyme it inhibits? Select all correct choices
A. an irreversible inhibitor B. a competitive inhibitor C. a non-competitive inhibitor D. both an irreversible inhibitor and a competitive inhibitor
Why was another nucleotide not added to the smallest fragment?
A) DNA polymerase became inactive after adding the last nucleotide. B) The last nucleotide added does not have a 3? hydroxyl group. C) The last nucleotide added does not have a 5? phosphate group. D) The DNA strand reached a length where it cannot grow any longer. E) DNA polymerase reached the end of the template.
________ culture techniques are based on the expansion of the microenvironment to allow abundant growth of a microorganism formerly restricted to a small ecological niche.
Fill in the blank(s) with the appropriate word(s).
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.