The most abundant molecule in cell is

Options

A. Water
B. Carbohydrates
C. Lipid
D. Protein

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the most abundant molecule in a cell. We need to analyze the composition of cells to determine which molecule is present in the highest quantity.

2. **Identifying Cell Components**: Cells are made up of various components, including water, proteins, carbohydrates, lipids, nucleic acids, and ions. We will look at the average percentages of these components to find the most abundant one.

3. **Analyzing the Composition**:
- **Water**: Comprises approximately 70-90% of the total cellular mass.
- **Proteins**: Make up about 10-15% of the cellular mass.
- **Carbohydrates**: Account for around 3%.
- **Lipids**: Constitute about 2%.
- **Nucleic Acids (DNA and RNA)**: Represent around 5-7%.
- **Ions**: Make up about 1%.

4. **Comparing Percentages**: By comparing the percentages, we see that water has the highest percentage (70-90%), followed by proteins, carbohydrates, lipids, nucleic acids, and ions.

5. **Conclusion**: Based on the analysis, the most abundant molecule in a cell is water.

### Final Answer:
The most abundant molecule in a cell is **water**.

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