Question

15 multiple choice 1 point
________ bind to the active site of an enzyme.
substrates and some types of inhibitors
allosteric inhibitors
some types of activators
allosteric activators
16 multiple choice 1 point
in the following series of statements, three are correct and one is incorrect. which statement is incorrect?
the growing polypeptide remains in the p site throughout translation
the following are stop codons in translation: uag, uaa and uga
an uncharged trna is ejected from the e site as the ribosome slides to the next codon
regardless of the amino acid to be bound to a trna molecule, all trna molecules use the same sequence at their 3 end(cca) to serve as the amino acid attachment site
17 multiple choice 1 point
the bond that forms between amino acids:
connects water molecules and carboxyl groups of adjacent amino acids
connects amino groups and carboxyl groups of adjacent amino acids
connects hydrogen atoms of adjacent amino acids
can form between any chemical groups of adjacent amino acids
connects amino groups and r groups of adjacent amino acids

Explanation:

1. For question 15: Substrates bind to the active - site of an enzyme. Some types of inhibitors (competitive inhibitors) also bind to the active - site. Allosteric inhibitors and activators bind to allosteric sites, not the active - site.
2. For question 16: In translation, the growing polypeptide chain moves from the P - site to the A - site as new amino acids are added, not remaining in the P - site throughout. The stop codons are UAG, UAA, and UGA. An uncharged tRNA is ejected from the E - site as the ribosome moves, and all tRNA molecules have a CCA sequence at their 3' end for amino - acid attachment.
3. For question 17: The bond between amino acids is a peptide bond which forms between the amino group of one amino acid and the carboxyl group of the adjacent amino acid.

Answer:

1. Substrates and some types of inhibitors
2. The growing polypeptide remains in the P site throughout translation
3. connects amino groups and carboxyl groups of adjacent amino acids