The second messenger for the hormone mechanism in Figure 49-2 is:
a. ATP.
b. G protein.
c. cAMP.
d. calmodulin.
e. Ca2+
C
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A researcher runs a BLAST program comparing turkey phenylalanine hydroxylase, which functions in the metabolism of phenylalanine, with known database sequences. Which of the following should provide the closest match?
A. green pufferfish B. zebrafish C. chicken D. orangutan E. fruit fly
The structure in Figure 27-3 labeled 4 is:
a. haploid. b. diploid. c. polyploid. d. a zygote. e. produced by meiosis.
In human blood groups, the fact that an individual can have an AB blood type is an example of ___________
A. incomplete dominance B. incomplete penetrance C. sex-influenced trait D. temperature-sensitive conditional allele E. codominance
At which point on a cladogram do two species share an ancestor?
A. taxon B. Node C. Tip D. Branch