LABORATORY REVIEW
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It may code for the same amino acid as another codon.
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It never codes for more than one amino acid.
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It extends from one end of a tRNA molecule.
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It is the basic unit of the genetic code.
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Detailed explanation-1: -Codon is the triplet nucleotide sequence on mRNA. However, one end of the tRNA contains the amino acid coded by the mRNA codon. Thus, the tRNA molecule does not contain a codon. Therefore, the given statement is true.
Detailed explanation-2: -It may code for the same amino acid as another codon. It extends from one end of a tRNA molecule.
Detailed explanation-3: -There are three nonsense codons – UAA, UAG and UGA. These codons are not recognised by any of the tRNAs, and so they bring about the temination of translation.
Detailed explanation-4: -Anticodon An anticodon is a trinucleotide sequence located at one end of a transfer RNA (tRNA) molecule, which is complementary to a corresponding codon in a messenger RNA (mRNA) sequence.
Detailed explanation-5: -Final answer: Ambiguous is not a property of the genetic code.