Protein synthesis termination triplet
(A) Nonsense codon
(B) Anticodon
(C) Ribosome
(D) Exon
(E) Poly-A tail
Answer: (A) Nonsense codon
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Lysogeny refers to
A. the latent state of herpes infections. B. virions exiting host cell. C. altering the host range of a virus. D. the viral genome inserting into bacterial host chromosome.
Which is(are) the principal substance(s) that
regulate(s) thigmotropism? a. auxin and ethylene b. gibberellin and ethylene c. abscisic acid and auxin d. cytokinin and abscisic acid e. none of these
The products of an endocrine gland:a
only affect their own tissues. b. can have a digestive function. c. always stimulate the target tissue. d. generally have to travel to reach the target tissue. e. are not produced by cells in organs, such as the heart.
Consider the phylogeny below. Why did Lutzoni and Pagel suggest that fungal species involved in mutualistic relationships with algae (dark grey branches) or liverworts (light grey branches) evolve faster than free-living fungi (black branches)?
a. Branch lengths for mutualistic taxa are on average longer than for free-living taxa. b. The phylogeny does not reveal any clues about evolutionary speed; separate tests were neces-sary. c. We cannot tell because there is only one independent comparison between mutualistic and free-living taxa. d. B and C.