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

Biology & Microbiology

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In sarcomers, phosphate-group transfers from ATP activate _____

a. actin c. both b. myosin d. neither

Biology & Microbiology

The inorganic non-protein components that participate in enzyme catalysis are known as  

A.  coenzymes. B.  cofactors. C.  products. D.  substrates. E.  reactants.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology