Which of the following statement is correct?

Options

A. lipid is not a biomacromolecule
B. lipid forms polymer
C. proteins are heteropolymer
D. all the above are correct except B

Answer

To determine which of the statements is correct regarding biomolecules, let's analyze each option step by step.

### Step 1: Analyze the first statement - "Lipid is not a biomicro molecule."
- **Explanation**: Lipids are indeed biomolecules. They are fatty derivatives and are considered as biomolecules, but they have a lower molecular weight compared to macromolecules like proteins and nucleic acids. Therefore, they can be classified as micro biomolecules.
- **Conclusion**: This statement is **correct**.

### Step 2: Analyze the second statement - "Lipid forms polymer."
- **Explanation**: Lipids do not form polymers. They are generally monomeric units and do not combine to form larger polymeric structures like proteins or nucleic acids do. Therefore, this statement is **incorrect**.
- **Conclusion**: This statement is **incorrect**.

### Step 3: Analyze the third statement - "Proteins are heteropolymers."
- **Explanation**: Proteins are indeed heteropolymers. They are composed of long chains of amino acids, which are the basic building blocks. There are 20 different amino acids that can combine in various sequences to form different proteins. Since proteins are made up of different types of amino acids, they are classified as heteropolymers.
- **Conclusion**: This statement is **correct**.

### Final Conclusion:
- Since the first and third statements are correct, and the second statement is incorrect, the correct answer is: **All of the above are correct except B**.