Which statement highlights a unique role of water in a biological system?

• A. Water acts as a universal solvent, facilitating chemical reactions.
• B. Water has a low specific heat, causing rapid temperature changes.
• C. Water is a nonpolar molecule, repelling other substances.
• D. Water is a poor conductor of electricity, preventing ion movement.

Answer: (A)

Verified step by step guidance

1. Identify the unique properties of water that are relevant to biological systems. Water is known for its polarity, high specific heat, and ability to dissolve many substances.
2. Consider the role of water as a solvent. Water's polarity allows it to dissolve ionic and polar substances, making it a 'universal solvent' which is crucial for facilitating chemical reactions in biological systems.
3. Evaluate the statement about water's specific heat. Water actually has a high specific heat, meaning it can absorb a lot of heat before changing temperature, which helps stabilize environments.
4. Analyze the statement about water being nonpolar. Water is actually a polar molecule, which is why it can dissolve other polar substances and ions.
5. Consider the statement about water's conductivity. Water is a good conductor of electricity when ions are present, as it facilitates ion movement, contrary to the statement provided.