Hexokinase is an example of

Options

A. oxidoreductase
B. transferase
C. hydrolase
D. isomerase

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks what class of enzyme hexokinase belongs to. The options provided are oxidoreductase, transferase, hydrolase, and isomerase.

2. **Analyzing the Classes of Enzymes**:
- **Oxidoreductase**: This class of enzymes is responsible for the transfer of electrons between substrates. They catalyze oxidation-reduction reactions, where one substrate gets oxidized (loses electrons) and another gets reduced (gains electrons).
- **Transferase**: Enzymes in this class facilitate the transfer of specific functional groups (like methyl or phosphate groups) from one molecule to another. They are crucial in various metabolic pathways.
- **Hydrolase**: These enzymes catalyze the hydrolysis of substrates, which involves the addition of water to break chemical bonds, resulting in the breakdown of larger molecules into smaller ones.
- **Isomerase**: This class of enzymes catalyzes the rearrangement of molecular structures, converting one isomer into another without changing the molecular formula.

3. **Identifying Hexokinase**:
- Hexokinase is an enzyme that plays a critical role in glycolysis, the metabolic pathway that converts glucose into glucose-6-phosphate.
- During this reaction, hexokinase transfers a phosphate group from ATP (adenosine triphosphate) to glucose, converting it into glucose-6-phosphate. This process involves the transfer of a specific group (the phosphate group).

4. **Conclusion**: Since hexokinase facilitates the transfer of a phosphate group from ATP to glucose, it falls under the category of transferase enzymes. Therefore, the correct answer is **transferase**.

### Final Answer:
Hexokinase is an example of **transferase**.

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