Unformatted text preview: Photosynthesis and
By: Maya South Cellular respiration vs. Photosynthesis 1.
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
RNA and dna Doesn’t contain photosynthetic
nucleus Involved in aerobic respiration Provides cell
with energy Bean shaped 3 Chloroplast Only in the plant cell
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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