The DQ is the _____ dose for irradiation of human cells.
a) single-target
b) multi-hit
c) lethal
d) threshold
Ans: d) threshold
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To form a blood clot, a series of plasma proteins must activate in a given sequence. If DNA info for one such protein mutates such that the resulting protein is nonfunctional, predict the consequence.
A. It depends on which protein is affected. B. Regardless of the protein involved, the clot would not form.
Enzymes called ____ form breaks in the DNA molecules to prevent the formation of knots in the DNA helix during
replication. a. topoisomerases b. single-strand binding proteins c. DNA polymerases d. RNA polymerases e. DNA ligases
Suppose that photosynthetic eukaryotic cells are provided with CO2 synthesized with heavy oxygen (18O). Then suppose that the 18O label will be found in all but one compound. What is that compound?
a. glucose b. O2 gas c. cellulose d. 3-phosphoglycerate
If you expose a photosynthesizing plant to water that contains both radioactive H and radioactive O, in which of the products of photosynthesis will the radioactive H and O show up?
A) H and O both in glucose B) H in glucose; O in water C) H in water; O in glucose D) H in glucose and water; O in O2