Ch.17 - Gene ExpressionWorksheetSee all chapters
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Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
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Sections
Gene Expression and the Genetic Code
Transcription
RNA Processing
Translation
Mutation

Solution: How do stop codons on mRNA function to end protein synthesis?A. Since the stop codon is composed of more than three nucleotide bases, a stop codon cannot enter the ribosome, which forces protein synth

Problem

How do stop codons on mRNA function to end protein synthesis?

A. Since the stop codon is composed of more than three nucleotide bases, a stop codon cannot enter the ribosome, which forces protein synthesis to end.

B. The polypeptide chain breaks away from the ribosome when the amino acid. methionine, is added to the chain in response to a stop codon.

C. Protein synthesis ends at a stop codon because the stop codon does not code for an amino acid, so new amino acid is added to the polypeptide chain.

D. A series of three stop codons in a row adds the three amino acids that signal the terminal end of the growing polypeptide chain.

Solution

The translation process is the synthesis of a polypeptide chain from its mRNA template. This happens with the assistance of endoplasmic reticulum-bound or free ribosomes. The actual mRNA sequence to be translated is indicated by start and stop codons. These, along with other codons, are three base sequences that have an equivalent amino acid or carries a particular instruction such as initiate or end the translation process.

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