How does photosynthesis take place in prokaryotes such as cyanobacteria, which have no chloroplasts?
AWithin the nucleoid region of the cell
BWithin specialised storage vacuoles only
CWithin the rigid outer cell wall layer
DWithin folded membranes and the cytoplasm
Answer & Solution
Correct answer: D. Within folded membranes and the cytoplasm
1. Eukaryotic autotrophs such as plants and algae have chloroplasts in which photosynthesis takes place.
2. Prokaryotes such as cyanobacteria have no such organelle.
3. In them the process is less localised, occurring within folded membranes and in the cytoplasm.
4. Those folded membranes are extensions of the plasma membrane.
5. Starch accumulation in chloroplasts is a eukaryotic feature that has no prokaryotic equivalent here.
6. Placing the process in the nucleoid confuses the site of the genetic material with a metabolic site.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.1 Overview of Photosynthesis_
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