RFLP, true are -a) Endonuclease cuts DNA at nucleotide levelb) It acts at specific sitec) Only cohesive ends are producedd) Only blunt ends are produced
The options are a, b, c, d. The question is asking which statements are true about RFLP. Let's break down each option.
Option a says endonuclease cuts DNA at the nucleotide level. Restriction endonucleases do cut DNA, but they recognize specific sequences and cut there. However, the term "nucleotide level" is a bit vague. They cut at specific sites, which are sequences of nucleotides, so maybe this is correct. But wait, the actual cutting is at the DNA backbone between nucleotides, not at the nucleotide level. Hmm, maybe this is a trick.
Option b: It acts at specific sites. Yes, restriction enzymes recognize specific DNA sequences, so this is true. That's a key feature of restriction enzymes used in RFLP.
Option c: Only cohesive ends are produced. Cohesive ends, also called sticky ends, are single-stranded overhangs. Some restriction enzymes produce these, but others produce blunt ends. So if the question says "only cohesive ends," that's incorrect because some enzymes make blunt ends.
Option d: Only blunt ends are produced. Similar to option c. Since some enzymes create sticky ends, this is also incorrect.
So the correct answers would be b and maybe a? Wait, the original question is a multiple-choice question with options A to D. The user's correct answer is not specified yet. Wait, the user provided the question and says the correct answer is to be determined. Let me check again.
Wait, the user provided the question with four options and the correct answer as none specified. Wait, the user's input shows the correct answer as "Correct Answer: [Letter]. [Answer Text]" but the user hasn't filled that in. Wait, the original question is in the user's input, and the correct answer is to be determined. Wait, no, the user is asking me to write the explanation for a given question and correct answer. Wait, the user provided the question and the correct answer as part of the input? Let me check.
Looking back, the user's input shows:
**Question:** RFLP, true are -a) Endonuclease cuts DNA at nucleotide levelb) It acts at specific sitec) Only cohesive ends are producedd) Only blunt ends are produced
A.
B.
C.
D.
**Correct Answer:** .
So the user hasn't provided the correct answer yet. But the user wants me to generate an explanation for the correct answer. Wait, perhaps the user made a mistake in the input. Let me check again. Wait, the user might have intended to include the correct answer but forgot. However, in the initial instructions, the user says "Given a multiple-choice question and its correct answer, write a thorough..." So in this case, the user is providing a question and the correct answer is to be determined by me. But in the input, the correct answer is not specified. Hmm, perhaps there's a mistake here. Wait, maybe the user intended to include the correct