In the image above, the substance indicated as "B" is a(n) ____

a. inhibitor
b. regulatory molecule
c. substrate
d. coenzyme
e. cofactor


ANSWER: c

Biology & Microbiology

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A water-soluble hormone (signaling molecule) would most likely bind to which membrane protein?

a. active transporter b. recognition c. receptor d. passive transporter e. regulator

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The genetic code, which specifies the three-letter codons that specify particular amino acids, is said to be redundant because ________

A) amino acid sequences are produced by different alleles B) it is observed in virtually all know organisms C) one codon can code for more than one amino acid D) phenotypic variation is observed depending on the codon usage E) some amino acids are coded for by more than one codon

Biology & Microbiology

Which amino acid always begins a polypeptide (protein) during translation?

A) valine B) phenylalanine C) methionine D) arginine

Biology & Microbiology

When NADH or NADPH transfers electrons to a recipient molecule, the recipient becomes reduced and the activated carries are oxidized (NAD+ or NADP+, respectively). What else happens during this reaction?

A.) a phosphate group is transferred to the recipient molecule B.) a proton is take up by the carrier C.) a proton is released into the solution D.) a proton is taken up by the recipient molecule E.) a molecule of water is released into the solution

Biology & Microbiology