MCQ
A naturally occurring coding strand composed of alternating C and U residues would result in the formation of polypeptide containing:
- AAlternating leu and ser residues
- BEither leu or ser residues
- COnly ser residues
- DOnly phe residues
Explanation:
As we know that a set of three bases of 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: CUCUCUCUCUCUCUCUCUCUCUCUCUCUCUCUCUC and so on. If read as triplet, it gives two alternating codons "CUC" and "UCU".
The codon CUC codes for leucine and UCU codes for serine. Thus, the resultant polypeptide will contain alternating leucine and serine residues.
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