There are vaccines for diseases caused by
a. bacteria.
b. viruses.
c. protozoa.
d. fungi.
e. a and b.
f. a, b, and c.
Answer: E
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PKU is a human disease in which the affected
individual is unable to metabolize the amino acid, phenylalanine. Symptoms of this disease include mental retardation, a lack of pigmentation, and black urine. PKU is an example of
a. epistasis. b. pleiotropy. c. incomplete dominance. d. co-dominance. e. complete dominance.
Which muscles may contract during inspiration?
a. external intercostals. b. internal intercostals. c. abdominal. d. both b and c.
Which of the following may occupy more than 90% of a mature plant cell's volume?
a. chromoplasts b. the rough endoplasmic reticulum c. the central vacuole d. the nucleus
Mitotic chromosomes are _____ times more compact than a DNA molecule in its extended form
(a) 10,000 (b) 100,000 (c) 1000 (d) 100