Why does fermentation have a relatively low ATP yield compared to aerobic respiration?
a. More reducing equivalents are used for anaerobic catabolism.
b. Less ATP is consumed during the first stage of aerobic catabolism.
c. Substrate-level phosphorylation has a poor ATP yield in anaerobic catabolism.
d. Aerobic catabolism uses oxidative phosphorylation.
Answer: D
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The following mRNA transcript would result in which polypeptide sequence?
5?-ACU UUC ACU AUG UUU UUA UCC UCC ACU CCU UGA-3? Use the following codons and the amino acids they encode. AUG = Start or Met; UUU, UUC = Phe; UUA, UUG = Leu; UCU, UCC = Ser; CCU, CCC = Pro; ACU, ACC = Thr; UGA = Stop. A. Thr-Phe-Thr B. Phe-Leu-Ser-Ser-Thr-Pro C. Met-Phe-Leu-Ser-Ser-Thr-Pro D. Thr-Phe-Thr-Phe-Leu-Ser-Ser-Thr-Pro E. Met-Phe-Leu-Ser-Ser
If an mRNA codon reads UAC, its complementary anticodon will be
A. CAG. B. AUG. C. TUC. D. ATG.
A scientist performs a controlled experiment. This means that
A) the experiment is repeated many times to ensure that the results are accurate. B) the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data. C) two versions of the experiment are conducted, one differing from the other by only a single variable. D) one experiment is performed, but the scientist controls the variables.
Unusual cellular extensions called prosthecae are associated with which of the following groups of proteobacteria?
A) alphaproteobacteria B) betaproteobacteria C) gammaproteobacteria D) deltaproteobacteria E) epsilonproteobacteria