Question

multiple choice question
in plants and algae, the proteins and chlorophyll molecules involved in the light-dependent reactions are ______.

embedded in the outer chloroplast membrane
embedded in the thylakoid membrane
in the stroma
in the cytoplasm

Explanation:

To solve this, we recall the structure of chloroplasts and the location of light - dependent reactions. The light - dependent reactions of photosynthesis in plants and algae occur in the thylakoid membranes. The proteins and chlorophyll molecules (which are part of the photosystems) involved in these reactions are embedded in the thylakoid membrane.

• The outer chloroplast membrane is not involved in light - dependent reactions.
• The stroma is the site of light - independent (Calvin cycle) reactions.
• The cytoplasm is not the location of chloroplast - based light - dependent reactions.

Answer:

B. embedded in the thylakoid membrane