Enormous diversity of protein molecules is due to

Options

A. Sequence of amino acids
B. R- groups of amino acids
C. Amino groups of amino acids
D. Peptide bonds.

Answer

To answer the question regarding the enormous diversity of protein molecules, we can follow these steps:

### Step 1: Understand what proteins are made of
Proteins are large biomolecules made up of smaller units called amino acids. There are 20 different amino acids that can be combined in various sequences to form proteins.

**Hint:** Remember that proteins are polymers made from monomers called amino acids.

### Step 2: Identify the components of amino acids
Each amino acid consists of three main parts:
1. An amino group (-NH2)
2. A carboxyl group (-COOH)
3. A variable side chain (R group) that distinguishes one amino acid from another.

**Hint:** Focus on the structure of amino acids and how the R group varies among them.

### Step 3: Recognize the role of the R group
The R group (side chain) of an amino acid is what gives each amino acid its unique properties. Different R groups can affect the protein's structure and function, contributing to the diversity of proteins.

**Hint:** Consider how variations in the R group can lead to different chemical properties and functions of proteins.

### Step 4: Understand the importance of the sequence of amino acids
The sequence in which amino acids are arranged (the primary structure) determines how the protein will fold into its three-dimensional shape. This folding is crucial for the protein's functionality. Even a small change in the sequence can lead to significant differences in the protein's properties.

**Hint:** Think about how the order of letters in a word changes its meaning; similarly, the sequence of amino acids changes the protein's identity.

### Step 5: Conclusion
The enormous diversity of protein molecules is primarily due to the sequence of amino acids and the variability introduced by the R groups. Therefore, the correct answer to the question is that the diversity is due to the **sequence of amino acids**.

**Final Answer:** The enormous diversity of protein molecules is due to the sequence of amino acids.