One kind of vaccine consists of
A) T cells.
B) B cells.
C) a harmless variant strain of a disease-causing microbe.
D) antibiotics.
Answer: C
Biology & Microbiology
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Which of the following statements DOES NOT characterize decomposers?
A. They feed on nonliving organic matter. B. They are saprobes. C. They break down wastes. D. They release nutrients that other organisms can use. E. They contain endosymbionts.
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Fossils indicate that the first cells were similar
to existing a. viruses. b. fungi. c. prokaryotes. d. eukaryotes. e. algae.
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Calcitonin acts in opposition to
a. parathyroid hormone. b. thyroxine. c. glucagon. d. the adrenal medulla. e. osteoblast activity.
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How many molecules of ATP can be generated from one molecule of NADH?
a. Three b. Two c. One d. Four
Biology & Microbiology