Enzyme that is responsible for unwinding of DNA is?
**Core Concept**
The process of unwinding DNA is crucial for replication and transcription, involving the separation of double-stranded DNA into single strands. This is mediated by specific **enzymes** that break the hydrogen bonds between the strands. **Helicases** are the key enzymes responsible for this process.
**Why the Correct Answer is Right**
The correct answer is related to the function of **helicase**, which is to unwind the double helix structure of DNA by breaking the hydrogen bonds between the nucleotide bases. This action creates a replication fork, allowing other enzymes to access the DNA strands for replication or repair. **Helicase** works by binding to the DNA and using **ATP hydrolysis** to provide the energy needed for unwinding.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct enzyme involved in DNA unwinding.
**Option B:** Similarly, this option does not accurately identify the enzyme responsible for the initial step of DNA replication or transcription.
**Option C:** This choice is also incorrect as it fails to recognize the specific role of helicase in the DNA replication process.
**Option D:** While important in DNA replication, this option does not correctly identify the enzyme that unwinds DNA.
**Clinical Pearl / High-Yield Fact**
Remembering that **helicase** is essential for DNA unwinding is crucial, as defects in helicase function can lead to genetic disorders and impair cellular processes like replication and transcription.
**Correct Answer:** D. Helicase