Cell Energy Worksheet
Answer the following questions:
• What is cellular respiration and what are its three stages?
Cellular respiration is the process that breaks down food to use as energy. The three main stages are glycolysis, citric acid cycle, and electron transport (Simon, Reece, & Dickey, 2010).
• What is the role of glycolysis? Include the reactants and the products. Where does it occur?
During glycolysis, a team of enzymes splits glucose and forms two molecules of pyruvic acid. After investing 2 ATP at the start, glycolysis generates 4 ATP directly. More energy is harvested later from high-energy electrons used to form NADH (Simon, Reece, & Dickey, 2010).
• What is the role of the citric acid cycle? Include the reactants and the products. Where does it occur?
The citric acid cycle takes specific compounds that donate protons and electrons to the electron transport chain which then generates ATP through the process of oxidative phosphorylation all of which occurs inside the mitochondria.
• What is the role of the electron transport system? Include the reactants and the products. Where does it occur?
The electron transport system, stage three of cellular respiration, functions as a chemical machine that uses the energy releases by the fall of electrons to pump hydrogen ions across the inner mitochondrial membrane (Simon, Reece, & Dickey, 2010).
• What is the overall goal of photosynthesis?
The overall goal of photosynthesis is provide plants with energy which in return provides us with energy when we eat the plant.
• Because photosynthesis only occurs in plants, why is it essential to animal life?
Photosynthesis is essential to animal life because humans and animals rely on the energy from the plants to give us energy.
• What is the role of the light reactions? Include the reactants and the products. Where does