| 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] Polycistroric mRNA is capable of forming a number of different polypeptide chains. |
| Reason [R] Polycistronic mRNA has terminator codons. |
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: B
Solution :
[b] Both A and R are true, but R is not the correct explanation of A. Polycistronic mRNA, commonly found in prokaryotes, two or more coding regions are present and can specify a number of polypeptide chains or proteins. It further contains multiple (open) reading frames to enable the formation of two or more proteins. Both polycistronic and monocistronic mRNAs have a 5' leader sequence, the coding region (containing initiation codon and termination codon) and a non-translated 3' trailer sequence.
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