The proteins which hasten the rate of a given metabolic conversation are called

Options

A. a) haemoglobins
B. b) metabolites
C. c) enzymes
D. d) none of these.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the type of proteins that increase the rate of a metabolic reaction.

2. **Definition of Metabolic Reactions**: Metabolic reactions involve the conversion of reactants into products. For this conversion to occur, reactants require a certain amount of energy known as activation energy.

3. **Role of Activation Energy**: The higher the activation energy, the slower the rate of the reaction. This is because reactants need more time to overcome the energy barrier to convert into products.

4. **Introduction of Enzymes**: Enzymes are special proteins that play a crucial role in metabolic reactions. They work by lowering the activation energy required for the reaction to proceed.

5. **Effect of Enzymes on Reaction Rate**: By decreasing the activation energy, enzymes increase the rate of the reaction, allowing the conversion of reactants to products to occur more quickly.

6. **Nature of Enzymes**: Enzymes are primarily proteinaceous in nature, meaning they are made up of proteins.

7. **Evaluating the Options**:
- **Option A: Hemoglobin** - Incorrect, as hemoglobin is involved in oxygen transport, not in increasing reaction rates.
- **Option B: Metabolites** - Incorrect, as metabolites are intermediates in metabolic pathways and do not increase reaction rates.
- **Option C: Enzymes** - Correct, as enzymes are proteins that increase the rate of metabolic reactions.
- **Option D: None of these** - Incorrect, since we have identified enzymes as the correct answer.

8. **Final Answer**: The proteins which hasten the rate of a given metabolic conversation are called **enzymes**.

---