1. Would you classify human beings as autotrophs or heterotrophs?

Answer: We are heterotrophs because we gain our food from other sources.


2. What do we collectively call all the reactions taking place in a cell?

Answer: Metabolism


3. What is the difference between anabolic and catabolic reactions?

Answer: Anabolic - simple substances join to make more complex ones. Catabolic - complex substances are broken down to make simpler ones.


4. Is the burning of wood an endergonic or exergonic reaction? Explain why.

Answer: The burning of wood is an exergonic reaction because energy is given off or released in the form of heat. An endergonic reaction uses energy.


5. What are enzymes?

Answer: They are special proteins that act as catalysts in a chemical reaction.