What is the small,circular,extrachromosomal $DNA$ molecule found in a bacterial cell,separate from the main genomic $DNA$?

Choose the wrong statements regarding bacterial cell.
$(i)$ Glycocalyx is the outermost envelope in bacteria.
$(ii)$ The glycocalyx could be a loose sheath called capsule.
$(iii)$ The glycocalyx may be thick and tough called slime layer.
$(iv)$ $A$ special structure formed by the plasma membrane is called mesosome.
$(v)$ Small bristle like fibres sprouting out of the cell are called fimbriae.

It is formed by the extensions of plasma membrane into the cell in prokaryotes.

Which of the following statements is incorrect regarding prokaryotic cells?

In photosynthetic bacteria,photosynthesis occurs in which of the following structures?

Provide information about the structure of the prokaryotic cell envelope and its specific functions.