The most frequent agent of nosocomial bacteremia is:
a. catalase-negative micrococci.
b. coagulase-positive staphylococci.
c. catalase-negative stomatococci.
d. coagulase-negative staphylococci.
D
The coagulase-negative staphylococci, among which Staphylococcus epidermidis is the most commonly encountered, are opportunistic pathogens. Their prevalence as nosocomial pathogens is highly related to medical procedures and practices.
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Vital capacity is always equal to
(a) tidal volume. (b) inspiratory reserve volume. (c) expiratory reserve volume. (d) a + b + c.
Pleiotropy refers to:
A. the interaction of two genes affecting a single trait. B. the interaction of multiple genes affecting multiple traits. C. the interaction of multiple genes affecting a single trait. D. a single gene having multiple effects. E. two different norms of reaction for a single trait.
George Beadle and Edward Tatum used auxotrophs to determine their "one gene–one enzyme" hypothesis. An auxotroph is best described as:
A. a defective enzyme. B. a result of nondisjunction. C. a mutant unable to grow on minimal media. D. a wild-type version of a model organism. E. an organism with a dominant lethal mutation.
What are the functions of N, Cro, and Q in phage lambda?
What will be an ideal response?