Gene therapy
a. has not yet been used successfully with
mammals.
b. is a surgical technique that replaces
defective genes with normal genes.
c. has been used successfully to treat victims
of autosomal dominant disorders by
replacing the dominant allele with a
recessive allele.
d. is a genetic engineering technique that
replaces defective alleles with normal ones.
e. is none of these.
D
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Fossils found in the lowest geological strata are generally the most
a. advanced. b. complex. c. primitive. d. widespread. e. specialized.
Which of the following statements regarding Q fever is incorrect?
A. The causative agent, Coxiella burnetii, produces resistant endospore-like structures. B. The disease is mild, and most cases go undetected. C. Symptoms include fever, muscle aches, rash, and occasionally pneumonia. D. The causative agent, Coxiella burnetii, is transmitted by lice. E. Humans can be infected from the airborne spread of particles from infected animals.
Which of the following types of mutation may play an important role in driving evolution because they are often nonlethal and, therefore, remain in the gene pool?
A. Frameshift B. Nonsense C. Missense D. Deletion
Polyunsaturated fats ____.
A. have fewer hydrogen atoms than do saturated fats B. are more characteristic of animal fats than plant fats C. have no double bonds D. are solid at room temperature E. are gas at room temperature