Mesosomes in bacteria are the functional unit for -
Lipid storage
Protein synthesis
Respiratory enzymes
None
Mesosomes (chondroid) 

Mesosomes are formed by invagination of plasma membrane into the cytoplasm.
They are more prominent in gram-positive bacteria.
They are the principal sites of respiratory enzymes in bacteria and are analogous to mitochondria of eukaryotes.
They coordinate nuclear and cytoplasmic division during binary fission.