quiz 14

During translation, chain elongation continues until ______________________.

A stop codon is encountered

How do you accurately describe the following most accurately describes Ala-tRNA^Cys?

A tRNA for Cys charged with Ala

Which of the following is most likely to interact with a charged bacterial initiator tRNA?

IF-2-GTP

Which is a characteristic of the genetic code:

One codon can code for only one amino acid

The enzyme peptidyl transferase, which catalyzes the transfer of thepolypeptide chain attached to the tRNA in the ____________ site to the aminoacyl-tRNA in the ____________ site, is a(an) ____________ .

P / A / rRNA of the large ribosomal subunit

As a ribosome translocates along an mRNA molecule by one codon, which of the following occurs?

The tRNA that was in the A site moves into the P site.

In bacteria (E.coli) termination codons are recognized by

class I release factors (RF1 or RF2)

Termination (termination & ribosome recycling) of translation involves all of the following except:

peptide bond formation

A mutant bacterial cell has a defective aminoacyl synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of a phenylalanine. The consequence of this for the cell will be that

proteins in the cell will include lysine instead of phenylalanine at amino acid positions specified by the codon UUU.

There are 61 mRNA codons that specify an amino acid, but only at most 45 different tRNAs in a cell. This is best explained by the fact that

some tRNAs have anticodons that recognize two or more different codons

During protein synthesis in E. coli:

the 16S rRNA correctly positions the start codon in the P site.

Internal Ribosome Entry Sites (IRES) may be present in the mRNAs of ________ _ to allow for translation of transcripts lacking G-cap

virus, eukaryotes