Refer to the accompanying figure. Secretion of potassium and ammonium ions occurs mainly in the portion labeled as:
a. 2.
b. 5.
c. 7.
d. 9.
e. 10.
d
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Stem cells
A. have an almost unlimited capacity to divide. B. can differentiate into different tissues. C. may be used to test the effects of drugs on human cells. D. come from fetal material. E. All of the above
In a molecule of methane, CH4, each hydrogen atom shares an orbital with the carbon atom. The total number of
shared electrons in CH4 is ____.
a. 1 b. 2 c. 4 d. 5 e. 8
How did the concept of biogeography shape Darwin's thinking?
What will be an ideal response?
Which of the following statements is TRUE?
(a) proto-oncogenes cause a loss of control of the cell cycle (b) the products of oncogenes may inhibit the cell cycle (c) tumor suppressor gene products inhibit the cell cycle (d) a mutation in a tumor suppressor gene may inhibit the cell cycle