All of the following are desirable features in a microbial cloning host, except
A. the host has a well-delineated genome.
B. the host has a slow growth rate.
C. the host is capable of accepting plasmid vectors.
D. the host can be grown in large quantities.
E. the host will secrete a high yield of proteins from expressed foreign genes.
Answer: B
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For a fish, what circumstances necessitate drinking water?
a. all of the choices b. solute concentration of body greater than surroundings c. solute concentration of body less than surroundings d. solute concentration of body equal to surroundings
On a scientific expedition into new territory, you discover a previously undescribed organism living within the very
hot environment of a geyser. This organism has a cell wall, is single celled, heterotrophic, and has no true nucleus. In what kingdom would you most likely place this organism and why? What will be an ideal response?
The Russian-American biochemist Phoebus Levene was the first to determine that nucleotides may contain one of four different nitrogen-containing bases. Levene believed that the nitrogen-containing bases occurred in equal amounts in DNA. What is the actual proportion of these bases?
a. DNA contains twice as much adenine and thymine as guanine and cytosine. b. All four do actually occur in equal amounts. Levene was right. c. DNA contains equal amounts of adenine and thymine, and equal amounts of guanine and cytosine. d. DNA contains equal amounts of guanine and thymine, and equal amounts of adenine and cytosine. e. DNA contains equal amounts of adenine and guanine, and equal amounts of thymine and cytosine.
Any microorganism that spends a portion of its life associated with another organism of a different species is engaged in ________.
A. synergy B. parasitism C. commensalism D. symbiosis