| Direction: Each of these questions contains two statements |
| Assertion [A] and Reason [R]. Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below. |
| Assertion [A] fRNA recognises its corresponding codon in mRNA. |
| Reason [R] For each codon, there is an individual RNA. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true, but R is not the correct explanation of A
C) A is true, but R is false
D) A is false, but R is true
Correct Answer: C
Solution :
[c] A is true, but R is false because mRNA has an anticodon loop which has 7 bases, out of which three bases form anticodon for recognising and attaching to the codon of mRNA. Since, there are 61 codons specifying amino acids, the cell should contain 61 different mRNA molecules, each with a different anticodon. The number of mRNA molecule types discovered is much less than 61. This implies that the anticodons of some mRNAs read more than one codon on ttzrna.
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