Question

Assertion :tRNA recognises its corresponding codon in mRNA. Reason: For each codon, there is an individual mRNA.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

tRNA has an anticodon loop which has 7 bases, out of which three bases form anticodon for recognizing and attaching to the codon of mRNA. Since there are 61 codons specifying amino acids, the cell should contain 6 different tRNA molecules, each with a different anticodon. Actually, however, the number of tRNA molecule types discovered is much less than 61. This implies that the anticodons of some IRNAs read more than one codon on mRNA.

So, the correct answer is 'Assertion is correct but Reason is incorrect'.