What is the source of sweat glands, hair follicles, and oil glands within the dermis of skin?
a. epithelium
b. loose connective tissue
c. the dermis
d. dense connective tissue
e. adipose
a
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Klebsiella spp. were isolated from a sputum sample, and susceptibility testing was performed. The isolates were sensitive to several antibiotics; however, they were resistant to ampicillin. Which one of the following statements explains this discrepancy?
a. The ampicillin disk is most likely expired. b. Because Klebsiella spp. should be sensi-tive to ampicillin, a technical error is to blame. c. Ampicillin inhibits cell wall synthesis. In addition, because Klebsiella spp. do not have a cell wall, they should not have been tested for ampicillin. d. No discrepancy is present; Klebsiella spp. are normally resistant to ampicillin.
Which procedure is most useful in quantifying the active transcription of botulism toxin genes in a can of food that is contaminated?
A. DNA hybridization B. End-point PCR C. Real-time PCR D. Southern blot
On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united. Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences. Which type of reproductive isolation operates to keep the mosquitofish isolated, even when fish from different ponds are reunited in the same body of water?
A. mechanical isolation B. gametic isolation C. temporal isolation D. behavioral isolation E. habitat isolation
A type of muscular dystrophy shows sex-linked recessive inheritance. Affected persons usually die by the age of 20. Suppose that a boy with the disease lives long enough to marry a woman heterozygous for the trait
If they have a son, what is the probability that he will have the disease? A) 0% B) 75% C) 50% D) 100% E) 25%