The emergency contraceptive pill (morning after pill) produces a pregnancy rate of about _____ percent
a. 1
b. 5
c. 10
d. 20
e. 50
ANSWER: d
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Which of the following hypotheses relies on the chemical reaction between hydrogen sulfide (HS2) and iron (Fe) for the built up of a H2 concentration gradient to provide the necessary energy for the reduction of N2 to NH3?
A. Reducing Atmosphere Hypothesis. B. Extraterrestrial Hypothesis. C. Deep-Sea Vent Hypothesis. D. Both Reducing Atmosphere and Extraterrestrial Hypotheses. E. All three hypotheses use this exact reaction to create a chemical gradient to form amino acids.
Which gene would you predict would be most likely to be part of a core genome and not the pangenome?
A) gene encoding DNA polymerase B) gene conferring antibiotic resistance C) gene conferring metal resistance D) gene encoding an enzyme required for lactose utilization
Alterations to DNA sites such as promoters and operators can act
A) only in cis. B) only in trans. C) either in trans or in cis. D) These terms apply only to posttranscriptional regulation.
Known as the "cell from hell," what toxin-producing dinoflagellate is responsible for significant fish kills in the mid-Atlantic region?
A) Vibrio cholera B) Conus magus C) Crassotrea virginica D) Mytilus edulis E) Pfiesteria piscicida