Where do the light reactions take place?
Correct answer: B. Thylakoid membrane
- A. Stroma
- B. Thylakoid membrane
- C. Chloroplast
- D. Leucoplast
Explanation
The light reactions of photosynthesis occur in the thylakoid membranes of the chloroplasts. During these reactions, light energy is captured by chlorophyll and other pigments, exciting electrons that drive the synthesis of ATP and NADPH. These molecules then provide the energy needed for the Calvin cycle in the stroma. The stroma is not the site of the light reactions but rather where the Calvin cycle, or light-independent reactions, occur. Chloroplasts as a whole are responsible for photosynthesis, but the distinction of regions is crucial for understanding the process. Leucoplasts, on the other hand, do not participate in photosynthesis at all, as they lack photosynthetic pigments.
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
Some photosynthetic organisms contain chloroplasts that lack photosystem II yet can survive. The best way to detect the "lack of photosystem II" in these organisms would be:
During cyclic photophosphorylation, electrons pass from all except:
Photosystem II has a reaction centre of
Each photon of light excites how many electrons?
Water splits during photosynthesis in/on:
NADP+ reductase transfers electrons from: