In a typical human cell, approximately what percentage of the cell’s mass is water?

• A. About 30%
• B. About 70%
• C. About 95%
• D. About 10%

Answer: (B)

Verified step by step guidance

1. Understand that the problem is asking for the approximate percentage of water by mass in a typical human cell.
2. Recall that human cells are composed largely of water, which acts as a solvent and medium for biochemical reactions.
3. Remember that water typically makes up the majority of the mass in most cells, often around two-thirds to three-quarters of the total mass.
4. Use this biological knowledge to estimate that the percentage of water in a typical human cell is close to 70%.
5. Confirm that this estimate aligns with standard cell biology references stating that about 70% of a human cell's mass is water.