The largest reservoir of methane is found
A) trapped under permafrost and marine sediments.
B) in the rumen of cows and other ruminant animals.
C) in the atmosphere.
D) trapped in volcanic rocks.
Answer: A
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The molarity of a solution is
A. a measure of solute concentration. B. the weight of a solid substance. C. often expressed as grams per unit volume. D. reflects a measure of the amount of oil dissolved in water. E. a scientific term for determining the solubility of a substance in water.
How do eukaryotic and prokaryotic control of gene expression differ?
What will be an ideal response?
It is difficult to make a vaccine against HIV because
a. the virus mutates rapidly. b. it is too expensive. c. it is a retrovirus. d. not enough is known about it. e. it contains reverse transcriptase.
The gametophyte is the dominant stage in the life cycle for which of the following plant groups?
a. club mosses b. whisk ferns c. ferns d. horsetails e. liverworts