Enzymes are absent in

Options

A. Algae
B. Fungi
C. Cyanobacteria
D. Viruses

Answer

To solve the question "Enzymes are absent in," we will analyze the given options one by one to determine where enzymes are not present.

### Step-by-Step Solution:

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are typically present in cells that have metabolic processes.

2. **Analyzing the Options**:
- **Algae**: Algae are photosynthetic organisms that contain cells. They have metabolic processes and therefore have enzymes.
- **Fungi**: Fungi are also made up of cells and have metabolic activities. They produce enzymes to aid in digestion and other processes.
- **Cyanobacteria**: Cyanobacteria are photosynthetic bacteria that also contain cells and have metabolic functions, meaning they possess enzymes.
- **Viruses**: Viruses are unique in that they are not considered living organisms. They are made up of nucleic acids (DNA or RNA) and proteins but lack cellular structures such as protoplasm, ribosomes, and cell membranes. Importantly, viruses do not have metabolic processes and therefore do not produce or contain enzymes.

3. **Conclusion**: Based on the analysis, enzymes are absent in viruses, as they do not have the necessary cellular structures or metabolic processes to produce them.

### Final Answer:
Enzymes are absent in **viruses**.

---