What cytokine is secreted by helper T cells, and stimulates proliferation of helper T cells and cytotoxic T cells, proliferation and differentiation of B cells, and enhances the activity of natural killer cells?
A) interferon-1
B) interferon-2
C) interleukin-10
D) interleukin-4
E) interleukin-5
Ans: B) interferon-2
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Fill in the blank(s) with the appropriate word(s).
The diarrhea that is a symptom of diseases like cholera is due to problems in the function of the
A. stomach. B. small intestine. C. large intestine. D. appendix. E. gall bladder.
In ecosystems bottom up processes, predators affect the abundances of other populations in the
ecological community. ____________________ Indicate whether the statement is true or false.
Discuss the links between Darwin's observations and inferences. Are some inferences more logical
than others? Is there evidence for all of the inferences?
What will be an ideal response?