What percent of Earth is dry land?
a. 10 percent
b. 25 percent
c. 30 percent
d. 45 percent
e. 50 percent
ANSWER: b
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Cellular crawling motion is accomplished by:
A. the polymerization of microfilaments along the leading edge in response to an activated cell surface receptor. B. the depolymerization of microfilaments along the leading edge in response to an activated cell surface receptor. C. the contraction of microfilaments along the leading edge in response to an activated cell surface receptor. D. the polymerization of microfilaments along the trailing edge in response to an activated cell surface receptor. E. All of these choices can contribute to rapid shifting of direction of crawling motion.
DNA is a self-replicating molecule. What accounts for this important property of DNA?
A. Replication is thermodynamically spontaneous and requires no enzymes. B. The nitrogenous bases of the double helix are paired in specific combinations: A with T and G with C. C. Its two strands are held together by easily broken covalent bonds.
When streaking for isolation and utilizing semi-quantitative methods, the numbers of colonial growth in successive quadrants correlates directly with:
a. the microbiologist's streaking technique. b. the relative amount of organism present in the original specimen. c. the ability of the organism to grow on the media. d. the type of incubation conditions.
A bacterial genus that is found in large numbers in the intestinal tract of breast-fed infants is
A. Escherichia. B. Bifidobacteria. C. Bacteroides. D. Doderlein's bacillus.