3CO₂ + 6NADPH + 9ATP ⎯→ (CH₂O) 3 + 6 NADP + 9 ADP + 9 Pi + 3 H₂O. It is a summary equation of:
Correct answer: C. Dark reactions of photosynthesis
- A. Light reactions of photosynthesis
- B. Photosynthesis
- C. Dark reactions of photosynthesis
- D. Respiration
Explanation
The process described in the equation involves the fixation of carbon dioxide and its conversion into a three-carbon sugar using ATP and NADPH. This set of reactions is a cyclic pathway where carbon dioxide is incorporated into an organic molecule, reduced to form a carbohydrate, and the carbon acceptor molecule is regenerated. It is not a simple light-driven reaction, so it differs from the light reactions of photosynthesis, which primarily generate ATP and NADPH without fixing carbon. It is also not a general term for photosynthesis, which includes both light and dark reactions, nor is it respiration, which breaks down organic molecules to release energy rather than synthesizing them. The cycle accurately described by the equation is specifically the one that fixes carbon dioxide and produces a sugar molecule using the energy and reducing power from earlier reactions, making it the correct identification for this pathway.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
Practise Bioenergetics
1,378 free Bioenergetics MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Bioenergetics questions
The ratio of CO₂, NADPH₂, and ATP molecules required to synthesize starch from the output of the Calvin cycle is:
The ratio of CO₂, NADPH₂, and ATP molecules required for one Calvin cycle is
The ratio of CO₂, NADPH₂, and ATP molecules required to synthesize one glucose molecule from the output of the C₃ pathway is, respectively:
Which metabolic pathway breaks down one molecule of glucose into two molecules of pyruvate in the cytoplasm?
Pyruvate, the end product of glycolysis, follows different catabolic pathways depending on the:
What occurs in the absence of oxygen: