The primary transcripts in eukaryotes are most accurately described as
A. composed of RNA polymerase and associated histones.
B. having the exons removed and the introns retained for translation.
C. a faithful copy of the entire gene including exons and introns.
D. an exact copy of the gene, but the introns have been removed.
E. an RNA copy, but the non-coding exons and introns have been removed.
C. a faithful copy of the entire gene including exons and introns.
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Which of the following can control mRNA stability?
A. The stop codon that is used to terminate translation in the mRNA B. AU rich elements in the mRNA C. distance of the stop codon to the polyA tail D. number of A's in polyA tail
Symptoms of PMS are caused by
a. uterine lining separation and expulsion during the period. b. the hormone aldosterone causing more absorption of sodium. c. lack of exercise causing hormonal changes. d. lack of sunlight limiting hormone production. e. all of these.
In the Ames test, what happens when his- bacteria are exposed to a chemical and experience a higher level of growth than the control?
A) The his- bacteria now utilized histidine from the media. B) The reversion rate is lower than seen for spontaneous mutations. C) The his- bacteria utilized DNA repair tools to fix the mutation. D) A reversion mutation allowed the his- bacteria to regain their ability to make histidine (revert to his+). E) The tested chemical is regarded as a non-mutagen.
The TCA cycle generates all of the following from each acetyl-CoA molecule oxidized except ________.
A. one FADH2 molecule B. two CO2 molecules C. three NADH molecules D. two ATP or GTP molecules