What happens when excess proteins are consumed, and what are two biological uses of water?

Here are the answers to your questions:

4. Two biological activities that use water as a medium of life are:

• Transport of nutrients and waste products within the body (e.g., blood plasma).
• Biochemical reactions (e.g., hydrolysis, photosynthesis).

5. When excess proteins are taken into our body, they are broken down into amino acids. The amino acids undergo deamination in the liver, where their nitrogen-containing amino groups are removed and converted into urea. This urea is then transported to the kidneys and excreted in urine. The remaining carbon skeletons of the amino acids can be converted into glucose or fat and stored for energy.