Biology help needed Please

Question

During translation, chain elongation continues until what happens?

A) No further amino acids are needed by the cell

B) All tRNAs are empty

C) The polypeptide is long enough

D) A stop condon is encountered

E) The ribosomes run off the end of mRNA

Answer 1

The answer is D

Answer 2

D) A stop condon is encountered

There are indeed tRNA's that recognize stop codons, they just don't carry an amino acid with them.

Also ATG is a START codon, TAA, TAG and TGA are the 3 STOP codons.

Answer 3

D. Even though there is no tRNA for a stop codon, an enzyme (release factor) is encountered which hepls in the production of a protein.