A microorganism that has been used in the production of sour mash whiskey is ________.
A. Lactobacillus delbrueckii
B. Leuconostoc mesenteroides
C. Lactococcus lactis
D. Saccharomyces cerevisiae
Answer: A
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The human immunodeficiency virus (HIV) uses RNA, rather than DNA, to encode genetic information. During infection, however, HIV uses an enzyme known as reverse transcriptase to generate double-stranded DNA. Generally speaking, how would the enzyme generate a double strand of DNA from a single strand of RNA?
A. Reverse transcriptase first catalyzes the synthesis of a DNA copy from the viral RNA, and then catalyzes the synthesis of a second strand of DNA complementary to the first one. B. Reverse transcriptase first catalyzes the synthesis of a RNA copy from the viral DNA, and then catalyzes the synthesis of a second strand of DNA complementary to the first one. C. Reverse transcriptase first catalyzes the synthesis of a DNA copy from the viral RNA, and then catalyzes the synthesis of a second strand of DNA from the viral RNA.
Leptospirosis is often contracted
A. by eating infected animals. B. by eating contaminated vegetables. C. from contaminated animal urine. D. by the respiratory route.
Heart valve replacement in humans using a pig valve is an example of a(n)
A) autograft. B) isograft. C) allograft. D) xenograft.
Atherosclerosis is
a. a clot in an artery. b. build up of plaque in an artery. c. build up of plaque in a vein. d. high blood pressure. e. low blood pressure.