In process of replication deoxyribonucleoside triphosphate

Options

A. acting as substrate
B. providing energy for polymerisation reaction
C. acting as an enzyme
D. Both (1) & (2)

Answer

### Step-by-Step Solution:

1. **Understanding DNA Replication**:
- DNA replication is the process by which a new DNA molecule is formed from an existing (parent) DNA molecule. This is essential for cell division and the transmission of genetic information.

2. **Role of Deoxyribonucleoside Triphosphate (dNTPs)**:
- Deoxyribonucleoside triphosphates (dNTPs) are the building blocks of DNA. They consist of a deoxyribose sugar, a nitrogenous base, and three phosphate groups.

3. **Energy Source**:
- dNTPs are energy-rich compounds. The high-energy bonds between the phosphate groups can be broken to release energy, which is essential for the DNA replication process.

4. **Function in Replication**:
- During DNA replication, dNTPs provide the necessary energy for the polymerization reaction. This means they help in the formation of new DNA strands by adding nucleotides to the growing DNA chain.
- Additionally, dNTPs serve as substrates that are consumed during the enzymatic reactions of DNA replication.

5. **Conclusion**:
- Therefore, the functions of deoxyribonucleoside triphosphate during DNA replication include:
- Providing energy for the polymerization reaction.
- Serving as substrates for the enzymatic reactions involved in DNA synthesis.
- Based on this understanding, the correct answer to the question is that both functions are applicable, which corresponds to option number 4: both 1 and 2.