Enzymes are :

Options

A. a)enhancers of reaction rates
B. b)influenced by temperature
C. c)influenced by pH
D. d) (a) through (c)

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are primarily proteins that facilitate various metabolic processes.

2. **Evaluating the First Statement**: The first statement claims that enzymes are enhancers of reaction rates. This is true because enzymes lower the activation energy required for reactions, thus increasing the rate at which reactions occur.

3. **Evaluating the Second Statement**: The second statement mentions that enzymes are influenced by temperature. This is also true. Enzymes have an optimal temperature range in which they function best. High temperatures can lead to denaturation, where the enzyme's structure is altered, rendering it ineffective.

4. **Evaluating the Third Statement**: The third statement states that enzymes are influenced by pH. This is correct as well. Each enzyme has an optimal pH range, and extreme pH levels can also lead to denaturation of the enzyme, affecting its activity.

5. **Conclusion**: Since all three statements about enzymes are correct, the final answer is option D, which states that all the statements (A through C) are true.