Assertion : The long protein chain is folded upon itself like a hollow ball giving rise to the tertiary structure .
Reason : Tertiary structure gives a 3-dimensional view of a protein.

Explanation

To analyze the assertion and reason provided in the question, we will break down the statements step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "The long protein chain is folded upon itself like a hollow ball giving rise to the tertiary structure."
- Proteins are made up of long chains of amino acids, known as polypeptides. These chains undergo folding to achieve their functional forms.
- The tertiary structure refers to the overall three-dimensional shape of a protein, which is formed when the polypeptide chain folds and twists into a compact structure.

2. **Evaluating the Assertion**:
- This statement is correct. The folding of the protein chain does indeed lead to the tertiary structure, which can resemble a hollow ball depending on the specific protein.

3. **Understanding the Reason**:
- The reason states that "Tertiary structure gives a 3-dimensional view of a protein."
- The tertiary structure is crucial because it determines the protein's functionality and interaction with other molecules.
- The three-dimensional shape is essential for the protein's biological activity.

4. **Evaluating the Reason**:
- This statement is also correct. The tertiary structure provides a three-dimensional view of the protein, which is vital for understanding how it functions.

5. **Conclusion**:
- Both the assertion and the reason are correct.
- Furthermore, the reason provides a correct explanation for the assertion since the three-dimensional shape (tertiary structure) is indeed a result of the folding of the protein chain.

### Final Answer:
Both the assertion and reason are correct, and the reason is the correct explanation of the assertion.

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