A researcher might use site-directed mutagenesis because
A) spontaneous mutations occur too frequently to study.
B) using a mutagen yields results that are specific to a gene and not applicable everywhere in the genome.
C) mutation can happen at a specific site in the genome, compared to a mutagen that might cause mutations in several genes.
D) it works in humans but not in experimental organisms or cell culture.
C) mutation can happen at a specific site in the genome, compared to a mutagen that might cause mutations in several genes.
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Diglycerol tetraether lipids
A. tend to make the membrane less rigid. B. are found in some bacteria and some Archaea. C. form typical bilayer membranes in thermophilic Archaea of the genus Thermoplasma. D. are a characteristic feature of thermophilic Archaea.
The obvious advantage of the lactose operon is that
a. it allows bacteria to survive in the presence of lactose. b. lactose-metabolizing enzymes need not be made when lactose is not present. c. it enables bacteria to make lactose only in the presence of the proper enzymes. d. it negates the need for milk in the diet of adult humans. e. it enables glucose to substitute for lactose in the diet of lactose intolerant persons.
Which of the following describes how facilitated diffusion is powered?
a. Facilitated diffusion is "free of cost." b. Energy is required to do the work of establishing and maintaining a concentration gradient. c. ATP is required directly. d. The sodium-potassium pump powers facilitated diffusion. e. Facilitated diffusion is powered by endocytosis
Behavior modification is a technique used in psychological therapy to promote desirable changes in behavior.
a. true b. false