Neil is a football player. We can tell whether he is getting enough calories by all the following EXCEPT
a. determining his body fat level.
b. seeing if his body fat is about 5 percent to 18 percent.
c. monitoring weight changes on a weekly basis.
d. weighing him before and after football practice.
d. weighing him before and after football practice.
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The variables that investigators try to keep the same for both the experimental and the control groups are
(a) independent. (b) controlled. (c) dependent. (d) a and c.
Which of the following characteristics distinguished T cells from B cells?
A. B cells produce immunoglobulin while T cells do not. B. B cells originate in the bone marrow while T cells do not. C. B cells form memory cells while T cells do not. D. B cells are lymphocytes while T cells are not.
Development of all the structures listed below occur during neurulation EXCEPT:
A. cells that will form future pigment cells and certain facial bones. B. the central nervous system. C. the neural crest. D. the archenteron. E. somites.
When tumor suppressor genes mutate, their products
What will be an ideal response?