In the mechanism of action of a proton pump, the role of ATP is to:
a. cause a proton to bind to a carbohydrate.
b. cause a cell to take up protons by endocytosis.
c. cause a cell to release protons by exocytosis.
d. transfer protons to the inside of a cell.
e. transfer protons to the outside of a cell.
E
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The immunity of some black Africans to malaria is probably due to their
A. general health. B. cultural practices. C. age. D. genetic background.
What led to the increase in oxygen levels in the atmosphere on primitive Earth?
a. the first photosynthetic reactions b. photosynthetic cells that used water and not H2S as a source of electrons c. the development of cellular respiration pathways in cells d. the use of glycolysis in cells e. photosynthetic pathways that stripped oxygen off of carbon dioxide and retained only the carbon in subsequent steps
Insulin plays a primary role in glucose uptake by the _____.
A. liver B. brain C. muscle D. pancreas
Melanoma is a cancer that is frequently associated with a mutation in what gene?
A) in the IT15 gene B) in the Huntington gene C) in the DNA polymerase gene D) in the BRAF gene