Which of the following types of RNA is typically found as a strand that is about 75 to 90 bases long and folds into a structure with four double-helical segments?
a. tRNA
b. snRNA
c. pre-mRNA
d. rRNA
Ans: a. tRNA
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Which of the following is a disadvantage of using corn to manufacture ethanol as a fuel additive?
A. Ethanol contains far less energy than other fuels. B. Ethanol absorbs water and would thus corrode fuel pipelines used in transport. C. Use of corn as a fuel source drives up the cost of grain worldwide. D. All of these are disadvantages.
Which of the following explains the function of a cuticle on land plants?
a. providing a waterproof cover to leaves and stems b. facilitating the intake of carbon dioxide for photosynthesis c. regulating the flow of gases and water vapor d. deterring animals with poisonous secondary metabolites
Transgenic goats are now able to produce
proteins used to treat
a. cystic fibrosis. b. heart attacks. c. blood clotting disorders. d. nerve gas exposure. e. all of these
The change in the outcome resulting from variation in the treatment is known as the:
A. selection bias. B. treatment effect. C. effect of the treatment on the treated. D. random treatment.