Question

life requires energy. in a short essay (~100 words), describe the basic principles of energetically in an animal cell. how is the flow and transformation of energy different in a photosynthesizing cell? include the role of atp and enzymes in your discussion.

Explanation:

In an animal cell, energy is obtained through cellular respiration. Glucose is broken down in a series of enzyme - catalyzed reactions. Glycolysis, the citric acid cycle, and oxidative phosphorylation occur. ATP is generated as the energy currency. Enzymes lower the activation energy for these reactions. In a photosynthesizing cell, light energy is captured by chlorophyll. Through the light - dependent and light - independent reactions (Calvin cycle), ATP is produced during the light - dependent reactions. The Calvin cycle uses ATP (and NADPH) to fix carbon dioxide into organic molecules. So, the source of initial energy (chemical in animal cells vs. light in photosynthetic cells) and the pathways (cellular respiration vs. photosynthesis) differ, but both use ATP and enzymes.

Answer:

In an animal cell, energy from glucose via cellular respiration (glycolysis, citric acid cycle, oxidative phosphorylation) with ATP as energy currency and enzymes facilitating reactions. In a photosynthesizing cell, light energy is captured (light - dependent reactions make ATP), then used in Calvin cycle (with ATP) to fix CO₂. Different energy sources (chemical vs. light) and pathways (respiration vs. photosynthesis), but both use ATP and enzymes.