Questions: Multiple Choice Question Which of the following are included in metabolism? O Neither the synthesis nor the breakdown of organic molecules O Both the synthesis and breakdown of organic molecules O Only the synthesis of organic molecules O Only the breakdown of organic molecules Need help? Review these concept resources.

The answer is the second one: Both the synthesis and breakdown of organic molecules.

Explanation for each option:

1. Neither the synthesis nor the breakdown of organic molecules: This is incorrect because metabolism encompasses both processes. Metabolism is the sum of all chemical reactions in a living organism, which includes both building up (anabolism) and breaking down (catabolism) of molecules.

2. Both the synthesis and breakdown of organic molecules: This is correct. Metabolism includes both anabolic processes (synthesis of organic molecules) and catabolic processes (breakdown of organic molecules).

3. Only the synthesis of organic molecules: This is incorrect because it only describes anabolism, which is just one part of metabolism. Metabolism also includes catabolism, the breakdown of molecules.

4. Only the breakdown of organic molecules: This is incorrect because it only describes catabolism. Metabolism also includes anabolism, the synthesis of molecules.

In summary, metabolism involves both the synthesis and breakdown of organic molecules.