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Unformatted text preview: Photosynthesis and cellular Respiration By: Maya South Cellular respiration vs. Photosynthesis 1. 2. 3. 4. 5. In cellular respiration energy is released (exergonic) and then there is an increase in entropy. While in photosynthesis the energy is absorbed (endergonic) and then there is a decrease in entropy. Cellular respiration is a catabolic process (where a large molecule is broken down into simpler ones) but photosynthesis is an anabolic process (where complex molecules are formed from simpler ones) Cellular respiration uses the Krebs cycle to break down glucose (releases hydrogen carriers and carbon dioxide) while photosynthesis uses the Calvin cycle to synthesize glucose (requires hydrogen carriers and carbon dioxide) In cellular respiration hydrogen carriers release electrons for an electron transport chain (NADH and FADH2); in photosynthesis electrons from the transport chain are taken up by hydrogen carriers (NADPH). In cellular respiration electrons from the transport chain are taken up by oxygen; in photosynthesis water is broken down to oxygen to release electrons for an electron transport chain. 2 Mitochondria vs. Eukaryotic cell organelles (both in plant and animal cells) Double membrane Contains cristae (folds of inner membrane) Contains RNA and dna Doesn’t contain photosynthetic pigments Contains nucleus Involved in aerobic respiration Provides cell with energy Bean shaped 3 Chloroplast Only in the plant cell Contains thylakoids Contains Photosynthetic pigments Involved in photosynthesis Lens Shaped Pyruvate is available as a dietary supplement. Using the knowledge you have learned in this unit, explain WHY someone would add this to their diet. A calorie is a unit of measurement for energy. People mainly use the word calories referring to the amount of it in food (e.g. This apple has 50 calories). This is a way of saying how much energy your body could receive from consuming a food. Pyruvate is involved in the metabolic cycle to produce energy in your body, by breaking down glucose and converting it into energy. When your body is using energy (breaking down food, and other bodily functions) you are “burning calories“ or energy. The calories your body doesn’t use is stored as body fat. So, people use pyruvate as a dietary supplement mainly for weight loss. This is because theoretically, the pyruvate supplement would increase the amount of energy being produce, increasing the amount of energy (or calories) you’re burning, which would result in using more energy than you're consuming. This would then increase the breakdown of excess fat (the extra calories not burned) resulting in weight loss. 4 ...
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