Cells undergo exocytosis ____
a. to pump protons down a concentration gradient
b. when replicating
c. to secrete protein and wastes from the cell
d. to ingest nutrients
e. as a means of cellular protection
ANSWER: c
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Margarine is made by hydrogenating vegetable oils so that they take on the consistency of butter. Propose a chemical basis for this change from a liquid to a solid
A. Hydrogenation of fats changes them from saturated to unsaturated, which are more solid. B. Trans-fatty acids are changed from unsaturated to saturated, allowing them to solidify. C. Trans fatty acids are changed from saturated to unsaturated, allowing them to solidify. D. Hydrogenation of fats changes them from unsaturated to saturated, which are more solid.
UV light generates which of the following as a "signature" mutation in a gene?
A) DNA hydroxylation B) a single-strand break C) pyrimidine dimer formation D) cross-links between DNA strands E) changes in DNA methylation
Compared to a solution of pH 3, a solution of pH 1 is
A) 100 times more acidic. B) 10 times more acidic. C) 10 times more basic. D) 100 times more basic.
The reason that most body systems are concerned with getting oxygen to the mitochondria is so that _____
carbon dioxide can be given off ATP can be produced heat can be generated water can be released to the cells