Apotosis has mostly eliminated the human tail
by the end of
a. week 10.
b. week 8.
c. the 7th day.
d. the eighth month.
e. the third month
B
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Histone modification:
A. is fixed; once a histone is modified, it stays that way and the genes with which it is associated are turned on or off permanently. B. is fixed, but this has no effect on whether genes are expressed. C. is randomâ€"sometimes the lysines are modified and sometimes they're not, but the state is independent of the environment or cell type. D. can change over time in response to environmental cues, allowing genes to be turned on or off as needed. E. can change over time in response to environmental cues, but this has no effect on gene expression.
A neurotransmitter that was excitatory would produce an ______ that would ____ the postsynaptic neuron.
A. EPSP, depolarize B. EPSP, hyperpolarize C. IPSP, depolarize D. IPSP, hyperpolarize E. IPSP, not affect
The two amino acids depicted above both have side groups (R groups) that are
a. acidic and polar. b. uncharged and nonpolar. c. basic and polar. d. positively and negatively charged and nonpolar. e. uncharged and polar.
Germ-free animals are often more susceptible to infections and serious disease than are animals with a typical complement of normal microbiota. Based on this observation, which of the following would be an appropriate conclusion?
A. Normal microbiota are incapable of causing disease B. Normal microbiota stimulate the development of the immune system C. Normal microbiota are parasitic D. Normal microbiota are opportunists E. Normal microbiota provide supplemental nutrition to the host