The higher similarity of the chimpanzee genome to humans compared to baboons or dogs is accounted for by what main concept.
A. Over time divergence has occurred forming genetic differences, some bigger than others.
B. Species have become less diverse over time creating more mutations between species.
C. Reduction in divergence means a closer relationship between some species.
D. Some species share identical genomes where others are highly variable.
Answer: A
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Plant hormones bind specific cellular receptor molecules that trigger gene expression responses. Which statement is correct concerning these responses?
A. Only cells lacking receptors can bind hormones. B. Only cells in the meristem can respond. C. Only cells that express the appropriate receptors can bind hormones. D. Only cells that have been previously activated can bind hormones. E. None of these choices is correct.
Evolution of embryonic pathways probably occurs most commonly though ____
a. macroevolutionary mechanisms b. microevolutionary mechanisms c. protein recruitment d. extinction e. mutations during embryonic development
This animal has two atria and two ventricles
and two vascular circuits. This animal is
a. a Mountain Bluebird. b. a fire-bellied toad. c. a trout. d. a lobster. e. more than one of these
Where in Figure 9-3 is NADPH formed?
a. F
b. 4
c. 3
d. 2
e. B