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a
The cell envelope consists of a tightly bound three layered structure, of which plasma membrane is the innermost layer.
b
A specialized differentiated form of cell membrane called mesosome is the characteristic of prokaryotes.
c
Surface structures of the bacteria like flagella, pili and fimbriae play a major role in motility.
d
Ga vacuoles are found in blue green and purple and green photosynthetic bacteria.
answer is C.
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Detailed Solution
Pili and fimbriae are also surface structures of the bacteria but do not play a role in motility. They are known to help attach the bacteria to rocks in streams and also to the host tissues.