Metabolic function in human bodies is carried out by

Options

A. Lipids
B. Peptides
C. Nucleic acids
D. Enzymes

Explanation

**Step-by-Step Solution:**

1. **Understanding Metabolism:** Metabolism refers to all the biochemical processes that occur within living organisms to maintain life. It includes both catabolic reactions (breaking down molecules to produce energy) and anabolic reactions (building up molecules).

2. **Identifying the Role of Enzymes:** Enzymes are biological catalysts that speed up chemical reactions in the body. They are crucial for metabolic processes, as they lower the activation energy required for reactions to occur, allowing them to proceed at a rate necessary for life.

3. **Evaluating the Options:**
- **Lipids:** While lipids play important roles in energy storage and cell membrane structure, they do not directly carry out metabolic functions.
- **Peptides:** Peptides are short chains of amino acids and can have various functions, but they do not primarily carry out metabolic functions.
- **Nucleic Acids:** Nucleic acids (DNA and RNA) are involved in genetic information storage and transfer, but they do not directly catalyze metabolic reactions.
- **Enzymes:** Enzymes are the correct answer as they are the specific proteins that facilitate and regulate metabolic processes.

4. **Conclusion:** The metabolic functions in human bodies are primarily carried out by enzymes, which are essential for the coordination of various chemical reactions necessary for life.

**Final Answer:** Metabolic functions in human bodies are carried out by enzymes.

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