Enzymes

Step 1: Analyzing the assertion:
- Restriction endonucleases are enzymes that cut DNA at specific sites. These enzymes typically recognize palindromic sequences, which are sequences of nucleotides that read the same forwards and backwards on complementary strands of DNA.
- The assertion is correct because restriction endonucleases do indeed recognize and cleave palindromic sequences in the DNA.
Step 2: Analyzing the reason:
- Palindromic sequences are recognized by various restriction endonucleases, but the reason given is incorrect in naming the specific recognition sites for PstI and PvuI.
- PstI recognizes the palindromic sequence 5'-CTGCAG-3', and PvuI recognizes the palindromic sequence 5'-CAGCTG-3', which are not the only recognition sites for restriction endonucleases.
- Therefore, the reason is partially incorrect because it mentions the specific sites PstI and PvuI, but these are just examples and not applicable to all restriction endonucleases.
Step 3: Conclusion:
- The assertion is correct, but the reason provided is incorrect because it gives a misleading explanation.
Thus, the correct answer is option (C): (A) is true, but (R) is false.