The figure above represents ____
a. an exergonic reaction
b. a metabolic pathway
c. allosteric inhibition
d. allosteric regulation
e. an endergonic reaction
ANSWER: d
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A regulatory substance binds an enzyme outside of the active site and changes its shape so that it enhances the enzyme's activity. What does this illustrate?
a. allosteric regulation b. feedback inhibition c. redox reaction d. enhancing activation energy e. an active site, bound by substrate
Reproduction in prokaryotes is known as:
a. binary fission. b. meiosis. c. mitosis. d. sexual reproduction. e. spawning.
The time it takes for half of a radioisotope's
atoms to decay a. cannot be calculated. b. is used to construct the geologic time scale. c. is its half-life. d. is the same for uranium 238 and carbon 14. e. is all of these
All of the following statements about telomeres and telomerase are true EXCEPT that ________
A) telomeres shorten as cells age (senescence) B) telomerase minimizes telomere shortening C) telomerase activity is high in adult cells D) telomerase activity is high in embryonic stem cells E) None of these choices