Question

use the codon chart to answer the question.
what is the correct amino acid sequence that would result from a strand of messenger rna with the nitrogen base sequence uuuc gcgcaagu?
leucine-proline-arginine-aspartic acid
phenylalanine-arginine-alanine-serine
phenylalanine-arginine-aspartic acid-serine
leucine-arginine-alanine-arginine

Explanation:

Step1: Divide the mRNA sequence into codons

The mRNA sequence is UUUCGCGGCAAGU. Divide it into groups of three bases: UUU - CGC - GCA - AGU.

Step2: Use the codon chart to find each amino acid

• For UUU: Looking at the codon chart, with first base \(U\), second base \(U\), third base \(U\), it codes for phenylalanine.
• For CGC: First base \(C\), second base \(G\), third base \(C\), it codes for arginine.
• For GCA: First base \(G\), second base \(C\), third base \(A\), it codes for alanine.
• For AGU: First base \(A\), second base \(G\), third base \(U\), it codes for serine.

So the amino - acid sequence is phenylalanine - arginine - alanine - serine.

Answer:

B. phenylalanine - arginine - alanine - serine