Which molecule in the Krebs cycle acts as a substrate of the first reaction and is a product of the last reaction?
1.pyruvate
2.acetyl-coenzyme A
3.citrate
4.oxaloacetate
4
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When an outgrowth forms on the tubular body of a hydra and eventually separates and grows into adulthood, this is an example of
a. budding. b. fission. c. organogenesis. d. parthenogenesis.
Aerobic respiration is ultimately the reaction of glucose with oxygen to generate carbon dioxide, water, and energy. However, in a cell this process involves the transfer of electrons from glucose to carriers such as NAD+ over a lengthy series of steps. Why don't cells employ the direct reaction of glucose with oxygen to generate energy?
A. The direct reaction of oxygen with glucose does not spontaneously occur. B. The direct transfer of electrons from glucose to oxygen occurs via a combustion reaction that is incompatible with life. C. Oxygen and glucose are localized in different subcellular compartments. D. The direct reaction of oxygen with glucose would be much less efficient.
Female cardinals select male mates in part based on their bright red color. What effect would this have on a cardinal population that was in Hardy-Weinberg equilibrium?
A. The frequency of red alleles would be less than those predicted by Hardy-Weinberg equilibrium. B. The red allele frequencies would decrease because of equilibrium. C. The red allele frequencies would remain unchanged because of equilibrium. D. The frequency of red alleles would be equal to those predicted by Hardy-Weinberg equilibrium. E. The frequency of red alleles would be greater than those predicted by Hardy-Weinberg equilibrium.
Protein synthesis in eukaryotes is similar to the process in prokaryotes in that both eukaryotes and prokaryotes
A) have exons. B) have introns. C) require snRNPS. D) use methionine as the "start" amino acid. E) use codons to determine polypeptide sequences.