The structure of protein which gives a three dimensional view is

Options

A. Primary structure
B. `alpha`-helix
C. `beta`-pleated sheet
D. Tertiary structure

Answer

To answer the question about which protein structure gives a three-dimensional view, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Protein Structures**: Proteins have different levels of structure: primary, secondary, tertiary, and quaternary. Each level has distinct characteristics.

2. **Identify Primary Structure**: The primary structure is the sequence of amino acids linked together by peptide bonds. It is a linear chain and does not provide a three-dimensional view.

3. **Recognize Secondary Structures**: Secondary structures include alpha helices and beta-pleated sheets. These structures arise from hydrogen bonding between amino acids, creating local folded structures. However, they are still not fully three-dimensional.

4. **Define Tertiary Structure**: The tertiary structure is formed when the secondary structures (like alpha helices and beta sheets) fold upon themselves due to interactions between R groups of the amino acids. This folding creates a three-dimensional shape, which is crucial for the protein's function.

5. **Consider Quaternary Structure**: The quaternary structure involves multiple polypeptide chains coming together, but it is not the primary focus of the question regarding a single protein's three-dimensional view.

6. **Conclude the Answer**: Based on the definitions and characteristics of the different protein structures, the structure of protein that gives a three-dimensional view is the **tertiary structure**.

### Final Answer:
The structure of protein which gives a three-dimensional view is the **tertiary structure**.

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