The number of Amino acids in the two protomers of insulin are

Options

A. 21
B. 30
C. 29
D. 27

Explanation

To determine the number of amino acids in the two protomers of insulin, we can follow these steps:

### Step 1: Understand the Structure of Insulin
Insulin is a peptide hormone composed of two polypeptide chains known as the A chain and the B chain.

### Step 2: Identify the Number of Amino Acids in Each Chain
- The A chain of insulin consists of **21 amino acids**.
- The B chain of insulin consists of **30 amino acids**.

### Step 3: Calculate the Total Number of Amino Acids
To find the total number of amino acids in both chains, we simply add the number of amino acids in the A chain and the B chain together:
- Total amino acids = Number of amino acids in A chain + Number of amino acids in B chain
- Total amino acids = 21 (A chain) + 30 (B chain) = **51 amino acids**.

### Step 4: Analyze the Options
From the options provided:
- 21
- 30
- 29
- 27

The total number of amino acids (51) is not listed as an option. However, both individual chains (21 and 30) are present in the options.

### Conclusion
The number of amino acids in the two protomers of insulin are:
- A chain: 21 amino acids
- B chain: 30 amino acids

Thus, the correct answers from the options given are **21** and **30**.

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