How many unique mRNA codons can be constructed from the four different RNA nucleotides?
A. four
B. 12
C. 16
D. 61
E. 64
E. 64
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True or False: Oxidation is the gain of electrons
A. true B. false
The entrance into the cavity formed during gastrulation in sea stars and frogs is called the
a. archenteron. b. blastocoel. c. blastocyst. d. blastopore.
Charles Darwin called choosing a mate based on its color or some other characteristic:a
sexual selection. b. gamete selection. c. sexual orientation. d. gametic preference. e. postzygotic selection
Which of the following might make the most effective medication to treat gastric ulcers?
a. A chemical that kills bacteria in the stomach b. A chemical that stimulates the parietal cells of the gastric pits c. A chemical that inhibits epithelial cells in the stomach that produce mucus d. A chemical that stimulates the secretion of bile e. A chemical that stimulates the chief cells of the gastric glands