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Question: The codon on mRNA is CAU-CCU-AAA-CUG Identify the correct sequence of amino acids. A. His- Pro- ...

The codon on mRNA is CAU-CCU-AAA-CUG
Identify the correct sequence of amino acids.
A. His- Pro- Lys-Leu
B. Pro-His-Lys-Leu
C. His-Pro-Leu-Lys
D. Pro-Leu-Lys-His

Explanation

Solution

By the process of translation, the mRNA is translated into protein. This is possible with the help of tRNA as it brings complementary amino acid with the mRNA in the ribosomal site.

Step by step answer: The process by which proteins are derived from RNA is called translation. The sequence of amino acids in the protein is determined by the sequence of nitrogen bases in the amino acid. Each amino acid is programmed by a triplet code that consists of a sequence of three nitrogen bases in the DNA and the complementary bases in the mRNA.
-Proteins form the structural components of the cell. They are formed by the polypeptide chain of amino acids. Protein synthesis takes place in ribosomes inside the cell. The genetic information written in the DNA is transcribed and carried by the mRNA to the ribosomes for protein synthesis. The sequence of nitrogen bases in mRNA decides automatically the sequence of amino acids in a protein molecule.
-Genetic information for protein synthesis is coded in a DNA molecule. A single amino acid is determined by an order of three nitrogen bases. So, it is a three-letter code and the sequence of three bases determining a single amino acid is called a codon. There are 64 codons for all naturally occurring amino acids.
-Histidine is denoted by codons CAU and CAC. Proline amino acid is denoted by codons CCU, CCC, CCA, and CCG. Lysin is denoted by codons AAA and AAG. Leucine amino acid is denoted by codons CUU, CUC, CUA, and CUG.
Hence the correct option is A.

Note: Genetic code has certain salient features too. It is universal because the same code applies to all living organisms from bacteria to humans. Degeneracy is another feature which means that some amino acids are specified by many codons. These codons are called degenerate codons. Genetic code is unambiguous because no two amino acids are coded by the same codon.