Suppose one strand of a "mini-gene" has the base sequence TACCCGGATTCA. If we assume no introns are involved, how many amino acids does the polypeptide encoded by this gene have?
A) 12 B) 6 C) 2 D) 4
D
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Leptin, an appetite-suppressing hormone, is secreted by ________
a. the brain b. fat cells c. the intestines d. kidneys
To grow on artificial medium, prototrophic bacteria require
A) sunlight. B) amino acid supplements. C) vitamin supplements. D) All of these E) None of these
People who have phenylketonuria, a genetic disorder, are unable to break down the amino acid phenylalanine so that it can be used in cellular respiration. Yet they need phenylalanine in their diet. Why do they need to eat some foods with phenylalanine?
A) Amino acids yield the most energy per gram, so they need phenylalanine to supply their cells with energy. B) Amino acids are used to build proteins and so they need enough phenylalanine for biosynthesis without any leftover that needs to be broken down to enter cellular respiration. C) Cellular respiration can use proteins more readily than other types of molecules, so the amino acid phenylalanine is essential.
Feedback inhibition is defined as a mechanism of down-regulating enzyme activity by the accumulation of a product earlier in the pathway
a. true b. false