The term N-terminus refers to the presence of a(n) ________ at one of the ends of a polypeptide.
A. carbonyl group
B. carboxyl group
C. sulfate group
D. oxygen atom
E. amino group
Answer: E
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Specimens for microbiologic studies should be:
a. transported to the laboratory within 48 hours of collection. b. collected in nonsterile specimen contain-ers. c. transported in sealable, leak-proof plastic bags with a separate section for paper-work. d. sent to the laboratory on ice, no matter what type of specimen.
In sporotrichosis the lesions can remain localized or can spread throughout the body; in the latter case it is referred to as
A. fulminating sporotrichosis. B. systemic sporotrichosis. C. disseminated sporotrichosis. D. extracutaneous sporotrichosis.
Which of the following statements is false?
a. Most of the genes of the nucleus are inactive during early cleavage. b. The particular sector of the egg cytoplasm helps control the differences among cells. c. The amount of yolk present in the egg influences cleavage patterns. d. The zygote does not increase its cytoplasm, so cells resulting from cleavage of the zygote are smaller than the original zygote. e. Blastomeres receive identical maternal messages.
What is the purpose of plant hormones?
A) They are produced in small amounts but have great effects. B) They break down quickly after they are produced. C) They act only at the location where they are produced. D) They generally have one limited effect on the plant.