Bacteria are difficult to control because of their
A. high reproductive rate.
B. low metabolic rate.
C. lack of a nucleus.
D. lack of a cell wall.
A. high reproductive rate.
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Many bacteria carry plasmids containing bacterial genes that are easily and rapidly spread through an entire bacterial colony. Why are plasmids of particular concern to humans?
A) They carry genes for antibiotic resistance. B) They carry genes that code for substances that are toxic to humans. C) They carry genes that code for flagellae. D) They carry genes that enable bacteria to metabolize glucose.
A population of 1,000 birds exists on a small Pacific island. Some of the birds are yellow, a trait determined by a recessive allele. The others are green, a characteristic determined by a dominant allele. A hurricane on the island kills most of the birds from this population. Only ten remain, and those birds all have yellow feathers. Which of the following statements is true?
A) Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain both green and yellow birds. B) The hurricane has caused a population bottleneck and a loss of genetic diversity. C) This situation illustrates the principle of adaptive radiation. D) This situation illustrates the effect of a mutation event. E) The ten remaining birds will mate only with each other, and this will contribute to gene flow in the population.
Protists that ingest visible particles of food are called
A. phototrophs. B. saprozoic feeders. C. osmotrophs. D. phagotrophs.
A (missense/nonsense/silent) mutation of a gene usually produces a nonfunctional polypeptide.
Fill in the blank(s) with the appropriate word(s).