If bacteria do not have chloroplasts, then how do they perform photosynthesis?

Answer 1

Because Photosynthetic bacteria contain unstacked photosynthetic membranes with light harvesting pigments, which work like thylakoids of chloroplast.

Example: The Cyanobacteria are the largest and most diverse group of photosynthetic bacteria previously known as blue green algae . These are true prokayotes having no chloroplast but still perform photosynthesis. The reason for this is that they have chlorophylls which are dispersed in cytoplasm(not packed in chloroplast like photosynthetic eukaryotes). They carry out oxygenic photosynthesis i.e, they use water as an electron donor and generate oxygen during photosynthesis. Their photosynthetic systems closely resembles to that of eukaryotes:

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Answer 2
Piper Anderson
Bacteria perform photosynthesis through structures called chromatophores or infoldings of their cell membrane, where photosynthetic pigments are present.
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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