The oxygen needed by plants for metabolism is
ultimately derived from
a. aerobic respiration.
b. photosynthesis.
c. anaerobic respiration.
d. the atmosphere.
e. lightning discharges
B
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Which of the following is not true of the nucleolytic proofreading reaction of bacterial RNA polymerase?
A. Water is the nucleophile. B. It occurs when the enzyme backtracks after incorporating a mismatched base. C. rNTP is the product. D. It involves the melting of several RNA-DNA base pairs. E. All of the choices given are true.
The first haploid cell in the life cycle of a plant is the:
a. zygote b. gamete c. gametophyte plant d. spore e. spore mother cell
Invertebrate chordates include __________ and
__________, both marine filter-feeders. Fill in the blank(s) with the appropriate word(s).
Regarding Borrelia burgdorferi and Lyme disease, which one of the following is most accurate?
A. Borrelia burgdorferi infects a larger percentage of the rodent reservoir in western states, such as California, than in northeastern states, such as New York B. Pathogenesis of Lyme disease is based on the production of an exotoxin that induces interleukin-2 production by T-helper cells C. The vaccine against Lyme disease contains the capsular polysaccharide of all four serotypes as the immunogen D. Close family members of those infected with B. burgdorferi should be given ciproflaxacin E. Borrelia burgdorferi is transmitted to human by the bit of ticks of the genus Ixodes