The most important feature that permits a gene to act as a molecular clock is _____
A) a large number of base pairs
B) being acted upon by natural selection
C) a reliable average rate of mutation
D) a recent origin by a gene-duplication event
C
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The inorganic non-protein components that participate in enzyme catalysis are known as
A. coenzymes. B. cofactors. C. products. D. substrates. E. reactants.
The darker extremities characteristic of Siamese cats and Himalayan rabbits are due to a ________
a. mutation increasing the activity of an enzyme required for melanin production b. heat-sensitive form of an enzyme required for melanin production c. mutation inactivating the enzyme required for melanin production d. mutation making melanin production insensitive to temperature variations
At a source the phloem typically has a water potential that is ____ that in surrounding xylem
a. lower than b. about the same as c. higher than d. exactly the same as e. less negative than
In sarcomers, phosphate-group transfers from ATP activate _____
a. actin c. both b. myosin d. neither