Which group of animals is endothermic?
a. fishes.
b. mammals.
c. reptiles.
d. amphibians.
a
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Gene expression can be altered more easily at the level of post-transcriptional processing in eukaryotes than in prokaryotes because _____
A) eukaryotic mRNAs get caps and tails B) prokaryotic genes are expressed as mRNA, which is more stable in the cell C) eukaryotic exons may be spliced in alternative patterns D) prokaryotes use ribosomes of different structure and size
The deleted portions of the mRNA are called
A. Exon B. Replicon C. Internal D. Intron E. External
Oxygen is toxic to
A) obligate anaerobes. B) obligate aerobes. C) cancer cells. D) facultative organisms. E) All of the above.
Which of the following is not an agglutination test?
A. Counterimmunoelectrophoresis B. Blood typing C. Widal test D. Weil-Felix reaction E. Rapid plasma reagin (RPR) test