The poor fishing off the coast of Peru associated with
El Niño is related to
a. lack of typical oceanic upwellings
b. upwellings.
c. thermal inversions.
d. cyclonic activity.
e. oxygen depletion.
Answer: a
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Certain nutrients are considered "essential" in the diets of some animals because _____
A) only those animals use those nutrients B) these animals are not able to synthesize these nutrients C) the nutrients are necessary coenzymes D) only certain foods contain them
Animal viruses typically enter a cell by
a. membrane fusion. b. endocytosis. c. membrane fusion or endocytosis. d. direct penetration.
Histone deacetylase inhibitors are a class of drugs used as mood stabilizers and anti-epileptics that are also being researched for their efficacy as anti-cancer agents. Histone deacetylase inhibitors block the action of histone deacetylases, which remove acetyl groups from lysine residues in histone tails. How will blocking histone deacetylases affect gene expression in the cell?
A. Chromatin will become more tightly compact, and gene expression will be reduced. B. Chromatin will become more tightly compact, and gene expression will be increased. C. Chromatin will become more open, and gene expression will be reduced. D. Chromatin will become more open, and gene expression will be increased. E. Chromatin will become more methylated, and gene expression will be decreased.
AUGCGUCCA
The sequence of amino acids specified by this mRNA is a. serine – histidine – lysine. b. methionine – arginine – proline. c. methionine – alanine – serine. d. valine – arginine – leucine. e. none of these.