With the biological species concept, the process of speciation is frequently defined as the evolution of ____ between
populations.
a. genetic drift
b. gene flow
c. reproductive isolation
d. geographic separation
e. reproductive inclusion
ANSWER: c
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In an asynchronous population, most of the cells are in S phase because it is the longest phase of the cell cycle.
a. true b. false
Members of this group of protozoa are decomposers responsible for these infectious diseases: giardiasis (gastroenteritis), trichomoniasis (sexually transmitted disease), and trypanosomiasis (sleeping sickness—Trypanosoma gambiense).
A. flagellated protozoa B. sarcodina C. ciliates D. All of these answers are correct.
Which of the following organelles contains protein-digesting enzymes that break down proteins to amino acids?
A. chloroplasts B. lysosomes C. ribosomes D. mitochondria
The enzymes of animals in old vents should be more flexible than those of animals in young vents.
a. true b. false