How do prions differ from viruses?
a) Unlike viruses, prions are infectious proteins.
b) Unlike viruses, prions do not include any nucleic acids.
c) Unlike a virus, a prion is a single molecule.
d) all of the above
Ans: d) all of the above
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Compared with other precipitation tests, agglutination tests are
A) more sensitive. B) less sensitive. C) about equally sensitive. D) highly variable in sensitivity, and thus the sensitivities cannot be compared.
How many checkpoints occur during interphase prior to a cell entering mitosis?
a. one b. two c. three d. four
A stem cell is a cell that
a. can differentiate into specialized cell types. b. has already differentiated. c. can develop into two or three cell types. d. can only develop into skin cells. e. can only develop into bone cells
The proportion of the air we breathe accounted for by oxygen is approximately
A. 50%. B. 21%. C. 5%. D. 1%. E. 78%.