Question

Consider the following and choose the correct answer Assertion [A]: Type II restriction enzymes are preferred in recombinant DNA technology. Reason [R]: They cleave DNA at random sites far away from their recognition sequences. The correct answer is

• A. Both [A] and [R] are true and [R] is the correct explanation of [A]
• B. Both [A] and [R] are true and [R] is not the correct explanation of [A]
• C. [A] is true, but [R] is false
• D. [A] is false, but [R] is true

Hint:

Restriction enzymes: \[ \boxed{ \begin{aligned} \text{Type II} &\rightarrow \text{Cuts at/near recognition site} &\rightarrow \text{Most commonly used in genetic engineering} \end{aligned} } \]

Answer 1

The Correct Option is C

Step 1: Examine the assertion. Type II restriction enzymes are widely used in recombinant DNA technology because they recognize specific DNA sequences and cleave at predictable positions. Hence, \[ \boxed{\text{Assertion [A] is true}.} \]

Step 2: Examine the reason. Type II restriction enzymes do not cut DNA at random sites far from their recognition sequences. Instead, they cleave within or very close to their specific recognition sites. Therefore, \[ \boxed{\text{Reason [R] is false}.} \] Hence, \[ \boxed{(C)} \] is the correct answer.