According to the central dogma, which of the following represents the flow of genetic information in cells?
A) protein to DNA to RNA
B) DNA to RNA to protein
C) RNA to DNA to protein
D) DNA to protein to RNA
Answer: B) DNA to RNA to protein
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The differentiation of embryonic stem cells into neurons and glial cells is a consequence of which type of cell signaling?
A. juxtacrine B. paracrine C. autocrine D. endocrine E. All of these choices are correct.
We expect the fossil record to be incomplete for all of the following reasons EXCEPT:
A. All biomolecules, including lipids and pigment molecules, decay immediately after death. B. Fossilization requires burial in sediment. C. Sediments accumulate irregularly. D. Organisms with hard parts tend to fossilize more readily than soft-bodied organisms. E. Under normal conditions, organisms are broken down by biological and physical processes.
When the hazard factor is low, individuals tend to reproduce:
a. more often. b. earlier in life. c. only during particular seasons. d. later in life. e. less often
Which disorder is associated with a low level of parathyroid hormone?
A. tetany B. exophthalmic goiter C. osteoporosis D. simple goiter E. myxedema