Histones are involved in _______________
(a) regulating the checkpoints of the cell cycle
(b) lengthening the ends of the telomeres
(c) compacting the DNA molecule
(d) cytokinesis
Ans: (c) compacting the DNA molecule
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Choking involves blockage of the ____
a. larynx b. pharynx c. nasal passage d. bronchiole e. alveoli
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.
Explain the difference between an absolute and a relative refractory period. What will be an ideal response?
With the exception of ______, all animals have some tissues organized into organs.
a) sponges and insects b) amphibians c) insects d) roundworms and flatworms e) sponges and some cnidarians