Nitrosylation (addition of NO groups to proteins) occurs on the side chain of which of the following amino acids?
a. Lysine
b. Cysteine
c. Tyrosine
d. Serine or threonine
Ans: b. Cysteine
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You track aquatic coastal levels of nitrogen and phosphorus at high latitudes and notice a sharp increase in the winter and then again in the spring. What do you expect the effect of these nutrient increases will be on the plankton populations?
A. sharp spikes in population levels at essentially the same time (or, in phase) with the spikes in nutrients B. sharp spikes in population levels some time after (or, out of phase) with the spikes in nutrients C. a sharp spike in population levels in the spring, when light levels are higher; not much of a response in winter D. no effect of the changes in nutrient concentration on the plankton populations in either winter or spring
Two F+ E. coli strains are co-cultured in the same flask. One is Strr Thr+ and the other is Genr Thr?. The culture is then plated on minimal media that is supplemented with gentamycin only (not threonine) and a few colonies grow. What sort of genetic exchange is most likely occurring?
A) transformation B) conjugation C) transduction D) electroporation
Gram-negative bacilli are often treated with
A. aminoglycosides. B. vancomycin. C. synercid. D. isoniazid. E. penicillin G.
Some populations display continuous variation, which arises when _____.
A) epistatic interactions occur between the products of two or more genes B) environmental factors, such as temperature, vary seasonally C) multiple genes influence the inheritance of the same trait D) crossing over occurs during gamete formation