
Concept explainers
To conclude:
Regarding the origin of the plastids.
Introduction:
Plastid is a major “double membrane organelle. It is found in cells of algae, plants and few eukaryotic cells. They are the site for manufacturing and storage of chemical compounds that are important for the functioning of the cells.

Explanation of Solution
Protists that belong to phylum Apicomplexa causes malaria and contribute to infections associated with acquired immunodeficiency syndrome (AIDS). These
The antibiotic that inhibits the functioning of prokaryotic enzymes kills the parasite by “acting against the plastids of the parasite”. This explains the prokaryotic origin of the plastid and it’s DNA. The DNA encodes for the prokaryotic proteins (enzymes) due to this its enzyme can by inhibited by using antibiotics which are used against the enzymes of prokaryotes.
Thus, the parasite probably obtained the plastids by endosymbiosis in the same way that eukaryotic cell have acquired chloroplast and mitochondria.
The origin of the plastids is probably by endosymbiosis.
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