Aminoglycoside antibiotics ________.
A. inhibit cell wall synthesis
B. inhibit folic acid biosynthesis
C. bind to bacterial DNA polymerase
D. bind to the 30S ribosomal subunit
Answer: D
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Prezygotic reproductive isolation affects the ability of gametes to combine between species. Of the following, which is not an example of prezygotic reproduction isolation?
A. behavioral isolation B. habitat isolation C. temporal isolation D. hybrid infertility isolation E. mechanical isolation
Which of the following is classified as a trace element in the human diet?
a. potassium b. iron c. sulfur d. magnesium e. sodium
Which scenario best describes a double-blind study?
a. The investigator and the subjects wear blindfolds. b. No one knows what is in the experimental or control group c. The subjects do not know if they are in the experimental or control group. d. Neither the investigator or the subjects know if they are in the experimental or control group. e. The investigator does not know if subjects are in the experimental or control group.
Albinism is a recessive disorder in which the skin and hair fail to produce pigment. The following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder.
What was the probability that Deirdre and Geoff's first child would express the albino trait?
A. 1/2 B. 3/4 C. 1/8 D. 1/4