GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A polypeptide of 24 amino acids is formed
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A polypeptide of 124 amino acids is formed
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No polypeptides are formed
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A polypeptide of 25 amino acids is formed
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Detailed explanation-1: -If the 25th amino acid gets mutated to the UAA in a polypeptide chain of 125 amino acids then a polypeptide of 24 amino acids is formed because UAA is an end codon it does not code for any amino acids.
Detailed explanation-2: -A gene encoding a polypeptide of 50 amino acids, if 25th codon (UAU) is mutated to UAA, then the polypeptide forming would stop because UAA is a termination codon which will stop the polypeptide synthesis. Thus, the resultant polypeptide will have 24 amino acids.
Detailed explanation-3: -The results show that UAA, like UAG, directs the incorporation of glutamine, whereas UGA directs the incorporation of three amino acids, arginine, cysteine, and tryptophan.
Detailed explanation-4: -The codons UAA, UAG, and UGA are the stop codons that signal the termination of translation.