3.+Composition

Answer: We are heterotrophs because we gain our food from other sources.
 * Download a worksheet about the Composition of cells above.**
 * 1. Would you classify human beings as autotrophs or heterotrophs?**

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

Answer: Anabolic - simple substances join to make more complex ones. Catabolic - complex substances are broken down to make simpler ones.
 * 3. What is the difference between anabolic and catabolic reactions?**

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

Answer: They are special proteins that act as catalysts in a chemical reaction.
 * 5. What are enzymes?**

Answer: Aerobic respiration is a type of cellular respiration that requires oxygen. Anaerobic respiration does not use oxygen.
 * 6. What is the main difference between aerobic and anaerobic respiration?**

Answer: Pyruvic Acid
 * 7. Glycolysis occurs when glucose is changed into this acid. What is the acid?**

Answer: ATP or adenosine triphosphate has one more phosphate group than adenosine diphosphate.
 * 8. What is the main difference between ATP and ADP?**

Answer: photosynthesis
 * 9. Most autotrophs use this process to make food. The process literally translated means 'putting together light'. What do we call this process?**

Answer: chlorophyll
 * 10. What is the green pigment in the cells of plants called?**