Which of the following is NOT an advantage of live attenuated vaccine agents?
A) They elicit lifelong immunity.
B) They stimulate by cell-mediated and humoral immune responses.
C) They occasionally revert to virulent forms.
D) They require few or no booster immunizations.
E) The immune response generated by the vaccine closely mimics a real infection.
C
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Riftia tube worms contain unusual hemoglobins that bind(s)
A) H2S and O2 in order to transport these chemicals to their bacterial symbionts. B) high concentrations of O2 produced by their photosynthetic symbionts. C) sulfate to transport this ion away from their bacterial symbionts. D) ammonia that their bacterial symbionts produce.
Which of the following statements is correct?
A. All fungi, whether parasite or saprobe, are heterotrophs. B. All saprobes are heterotrophic, but only some are parasitic. C. All heterotrophs are parasites, but only some are saprobes. D. All heterotrophs are fungi, and include both parasites and saprobes.
The damage caused by ultraviolet radiation is
A) Repaired during transcription. B) Never repaired. C) Cut out and replaced. D) Repaired by DNA replication. E) Repaired during translation.
In a monohybrid cross, what kind of genes "disappear" in the F1 generation?
a. sex-linked b. dominant c. recessive d. codominant e. lethal