Heritability may be calculated as which of the following?
A. The total variance minus environmental variance
B. Total variance minus genetic variance
C. Genetic variance divided by environmental variance
D. Genetic variance divided by total variance
D
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Which of the following is not a characteristic of aquaporins?
a. They are transmembrane proteins. b. They facilitate the rapid transport of water through the plasma membrane. c. They are located in mammalian kidney tubules. d. They respond to specific hormones. e. They cause dehydration.
mRNA regulation can be achieved at the level of
A) transport. B) processing. C) translation. D) life span (degradation). E) All of these
Restriction enzymes cut double-stranded DNA _____.
A. at noncoding areas between genes B. at specific base sequences C. between bacterial and viral DNAs D. between purines and pyrimidines E. between promoter and operator DNA sequences
DNA polymerase catalyzes the joining of a nucleotide to a growing DNA strand. What prevents this enzyme from catalyzing the reverse reaction?
(a) hydrolysis of pyrophosphate (PPi) to inorganic phosphate (Pi) + Pi (b) release of PPi from the nucleotide (c) hybridization of the new strand to the template (d) loss of ATP as an energy source