A naturally occurring coding strand composed of alternating C and…

MCQ

A naturally occurring coding strand composed of alternating $C$ and $U$ residues would result in the formation of polypeptide containing:

✓
Alternating leu and ser residues
B
Either leu or ser residues
C
Only leu residues
D
Only ser residues

✓

Answer

Correct option: A.

Alternating leu and ser residues

As we know that a set of three bases of $\text{mRNA}$, called as triplet codon, specify one amino acid. Also genetic code is commaless and non$-$overlapping which means that one base can not be shared by two sequential triplets and the codons are read sequentially.
A naturally occurring coding strand composed of alternating $C$ and $U$ residues would have codons as: $\text{CUCUCUCUCUCUCUCUCUCUCUCUCUCUCUCUCUC}$ and so on. If read as triplet, it gives two alternating codons $"\text{CUC}"$ and $"\text{UCU}".$
The codon $\text{CUC}$ codes for leucine and $\text{UCU}$ codes for serine. Thus, the resultant polypeptide will contain alternating leucine and serine residues.

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