All the following are characteristics of marine mammals except:
a. mammary glands.
b. gills.
c. a placenta.
d. being homeothermic.
B
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Our understanding of the evolutionary process reveals that ____
a. favorable traits become less common in future generations b. all populations are related through a shared ancestry c. evolution has produced the spectacular diversity of life on Earth d. all organisms change through time e. development has produced the spectacular diversity of life on Earth
In one minute, human DNA polymerase replicates about ________ bases.
A) 40 B) 100 C) 1,000 D) 3,000
What phenotype would you expect to see in a strain of E. coli with a mutation in the phr gene?
A) decrease in UV-induced mutations B) increase in UV-induced mutations C) decrease in reversion of base-pair substitution mutations D) increase in the methylation of nucleotide bases E) decrease in the methylation of nucleotide bases
Muscle cells shorten because
A. they get bigger in diameter. B. sodium ions flow along the surface of the actin molecule. C. myosin molecules shorten. D. actin molecules slide by myosin molecules.