The most ancient group of plants alive today are:a
horsetail.
b. club moss.
c. hornworts.
d. liverworts.
e. gymnosperms.
D
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Many male songbirds are brightly colored. However, the color of the birds is determined by a balance of
A. natural selection against bright colors by predation and sexual selection in favor of bright colors. B. gene flow that reduces bright colors and natural selection in favor of bright colors. C. mutations that reduce bright colors and sexual selection in favor of bright colors. D. mutations that reduce bright colors and gene flow in favor of bright colors. E. natural selection against bright colors by predation and mutations that introduce bright colors.
Mitochondrial disorders are probably very rare because
A) people have many mitochondria, so the healthy ones can substitute for the affected ones. B) the oocytes with harmful mitochondrial mutations do not have sufficient energy to survive. C) they are difficult to diagnose because most physicians have forgotten what mitochondria are. D) they are not inherited from the father.
Hydrogens and electrons from the splitting of
water in photosynthesis become part of
a. oxygen gas b. ATP c. carbon dioxide d. glucose e. NADPH
A viticulturist wants to grow larger grapes by elongating the stems of the vines. Which specific hormone would a viticulturist apply to the plants?
A. Ethylene B. Gibberellin C. Auxin D. Abscisic acid E. Cytokinin