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a
All prokaryotic cells have glycocalyx
b
All prokaryotic cells have cell wall
c
All prokaryotic cells have plasmids
d
A heterocyst is a prokaryotic cell.
answer is D.
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Detailed Solution
Heterocysts are specialised cells of cyanobacteria meant for nitrogen fixation. Cyanobacteria are prokaryotes. Mycoplasma are prokaryotes without cell wall. Glycocalyx is seen only in certain bacteria or prokaryotic cells. Plasmids are seen only in certain strains of bacteria.