The following level of structure of protein gives 3D view of the protein

Options

A. Primary structure
B. Teritary structure
C. Secondary structure
D. None of the above

Answer

To answer the question regarding which level of protein structure provides a 3D view of the protein, we can follow these steps:

### Step 1: Understand the Levels of Protein Structure
Proteins have four levels of structure: primary, secondary, tertiary, and quaternary. Each level has distinct characteristics that contribute to the overall structure and function of the protein.

### Step 2: Define Each Level of Structure
- **Primary Structure**: This is the linear sequence of amino acids in a polypeptide chain. It does not provide any 3D structure; it is simply a straight chain.

- **Secondary Structure**: This involves the local folding of the polypeptide chain into structures such as alpha helices and beta sheets. While it introduces some folding, it is still not a complete 3D structure.

- **Tertiary Structure**: This level represents the overall 3D shape of a single polypeptide chain. The amino acids fold upon themselves, creating a complex structure that is stabilized by various interactions (like hydrogen bonds, ionic bonds, and hydrophobic interactions).

- **Quaternary Structure**: This structure involves multiple polypeptide chains coming together to form a functional protein. While it is a higher-order structure, the question specifically asks for the 3D view of a single protein, which is best represented by the tertiary structure.

### Step 3: Identify the Correct Answer
Given the definitions:
- The **tertiary structure** is the level that provides a 3D view of the protein, as it shows how the polypeptide chain folds into a complex shape.

Thus, the answer to the question is **tertiary structure**.

### Final Answer
The level of structure of protein that gives a 3D view of the protein is the **tertiary structure**.

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