Bacteria that are unable to synthesize tryptophan are referred to as ________.
A) prototrophs
B) auxotrophic for tryptophan
C) auxotrophic for histidine
A) prototrophs
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One would expect a human protein to show closest similarity with the same protein in
1. E. coli. 2. yeast. 3. chimpanzees. 4. fish. 5. snakes.
In androgen insensitivity syndrome,
a. no testosterone is produced. b. chemicals circulating in the blood deactivate the male hormone. c. the cellular receptor for testosterone in the target cells is defective. d. the male with this defect is normal in all respects except that he is sterile. e. all of these are true.
In what way might a virus contribute to cancer formation?
What will be an ideal response?
Consider the figure illustrating the two major classes of hormones and their actions. Which class of hormones would you expect to be ideally suited for long-term processes such as growth and development?
A) protein hormones, because they can relay messages B) steroid hormones, because they can turn specific genes on or off C) protein hormones, because they cannot cross cell membranes D) steroid hormones, because they can diffuse across cell membranes