Question

which would happen when the ribosome reaches a stop codon?
(mark all that are correct.)
new trnas join the mrna

transcription will end

translation will end

the amino acid stop is added

protein building is finished

rewatch

Explanation:

• "new tRNAs join the mRNA": Stop codons don't attract new tRNAs; tRNAs carry amino acids for coding codons, so this is incorrect.
• "transcription will end": Transcription (DNA to mRNA) ends at terminator sequences, not Stop codons (which are for translation), so incorrect.
• "translation will end": Stop codons signal the end of translation (protein synthesis at ribosomes), so this is correct.
• "the amino acid Stop is added": Stop codons don't code for an amino acid; they signal termination, so incorrect.
• "protein building is finished": Since translation (protein building) ends at Stop codons, protein building is complete, so this is correct.

Answer:

• translation will end
• protein building is finished