The Watson-Crick model of DNA exhibits…………….. Of DNA

Options

A. Primary structure
B. Secondary structure
C. Tertiary structure
D. Quaternary structure

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the type of structure that the Watson-Crick model of DNA exhibits. The options provided are primary structure, secondary structure, tertiary structure, and quaternary structure.

2. **Identifying the Model**: The Watson-Crick model refers to the double helix structure of DNA proposed by James Watson and Francis Crick. This model describes how DNA is structured.

3. **Defining DNA Structure**:
- **Primary Structure**: This refers to the linear sequence of nucleotides in a DNA strand. It is the order of the nitrogenous bases (adenine, thymine, cytosine, guanine).
- **Secondary Structure**: This refers to the three-dimensional shape formed by the interactions between the bases of the two strands of DNA. In the case of DNA, this is primarily the double helix formed by hydrogen bonding between complementary bases (adenine with thymine and cytosine with guanine).
- **Tertiary Structure**: This refers to the overall three-dimensional shape of a single DNA molecule, including how it is packaged within the cell.
- **Quaternary Structure**: This term is generally used for proteins and refers to the assembly of multiple polypeptide chains.

4. **Analyzing the Watson-Crick Model**: The Watson-Crick model specifically describes the secondary structure of DNA, which is characterized by the double helix formed by base pairing and hydrogen bonds between the complementary bases.

5. **Conclusion**: Therefore, the Watson-Crick model of DNA exhibits the **secondary structure** of DNA.

**Final Answer**: The Watson-Crick model of DNA exhibits **secondary structure** of DNA.

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