The antibodies produced by the B cells are each made up of ______ light chain(s) and _______ heavy chains(s)
a. one; one
b. one; two
c. two; one
d. two; two
e. two; three
D; Each Y-shaped molecule is composed of two heavy chains that form the stem and extend to the arms, where each is joined to a light chain.
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Which one of the following Gram-negative bacteria is least likely to be the cause of a nosocomial infection?
A) a Klebsiella spp. B) a Salmonella spp. C) Escherichia coli D) Pseudomonas aeruginosa
The value of inserting human genes suspected of
causing Alzheimer disease into mice is to a. make mice act more human. b. make antibodies, which can be injected into suffering patients. c. develop mice that can serve as models for study of this condition. d. use the mice for production of a vaccine for the disease. e. accomplish all of these.
If the frequency of a recessive allele is 36 percent,
the frequency of the dominant allele is what percent? a. 5 b. 8 c. 25 d. 48 e. 64
Peer review and replication are important for the progression of science...
Indicate whether the statement is true or false.