Which of the following species is endangered
a. California sea lion
b. northern fur seal
c. Steller's sea lion
d. both a and b
C
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A study of certain nuclear genes in humans and chimpanzees shows that the two species differ in 5 percent of their DNA bases. Base substitution mutations occur at a rate of 1 percent per one million years. How many million years ago did these species diverge?
A) 0.5 B) 1 C) 3 D) 5
The plant hormone that triggers the withering of petals and stamens and promotes fruit ripening is
A. abscisic acid. B. ethylene. C. jasmonic acid. D. cytokinins. E. gibberellins.
Which of the following traits does the fossil
above share with modern birds? a. long, clawed fingers on each forelimb b. it had teeth c. it had feathers d. it had a long bony tail e. all of these
Taste cells that respond to umami specifically interact with ____
a. sodium ions b. hydrogen ions c. quinine d. sugars e. glutamate