Hydrogen bonding is strongest between ____
a. adenine and guanine
b. uracil and thymine
c. guanine and uracil
d. adenine and thymine
e. cytosine and guanine
ANSWER: e
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Viruses defy characterization as living organisms even though they possess nucleic acids and proteins. The reason why viruses are not considered to be alive is because they
A. form spontaneously. B. cannot form spontaneously. C. cannot reproduce without a host cell. D. lack genetic material.
In the annual rings of woody trees, how does the cell size within the xylem of the spring and summer wood compare to the fall and winter wood?
A. It is more dense. B. It has smaller vessels. C. The cell walls are thicker. D. It is younger. E. The cells are larger.
A key limitation of the coefficient of community is that it lacks the ability to
A) compare relative abundances of each species. B) calculate the similarity between two communities. C) know the number of species common between communities. D) compute a percent similarity value.
Which of the following antiviral drug categories is NOT virus-specific, would NOT directly disrupt the machinery in human cells, and would effectively kill off an invading virus?
a. interferons b. nucleoside reverse transcriptase inhibitors (NRTIs) c. peptide fusion inhibitors d. protease inhibitors