Describe the structure of a prokaryotic cell.

(N/A) $\Rightarrow$ Prokaryotic cells are represented by bacteria,blue-green algae,mycoplasma,and $PPLO.$
$\Rightarrow$ They are generally smaller and multiply more rapidly than eukaryotic cells.
$\Rightarrow$ They vary greatly in shape and size. The four basic shapes of bacteria are bacillus,coccus,vibrio,and spirillum.
$\Rightarrow$ The organization of the prokaryotic cell is fundamentally similar even though prokaryotes exhibit a wide variety of shapes and functions.
$\Rightarrow$ All prokaryotes have a cell wall surrounding the cell membrane.
$\Rightarrow$ The fluid matrix filling the cell is the cytoplasm.
$\Rightarrow$ There is no well-defined nucleus. The genetic material is naked,not enveloped by a nuclear membrane.
$\Rightarrow$ Many bacteria have small circular $DNA$ outside the genomic $DNA$. These are called plasmids.
$\Rightarrow$ The plasmid $DNA$ confers certain unique phenotypic characters to such bacteria,such as resistance to antibiotics.
$\Rightarrow$ Plasmid $DNA$ is also used to monitor bacterial transformation with foreign $DNA.$
$\Rightarrow$ $A$ nuclear membrane is not found in prokaryotic cells.
$\Rightarrow$ Cell organelles like endoplasmic reticulum,Golgi bodies,and mitochondria are not present,except for ribosomes.
$\Rightarrow$ $A$ specialized differentiated form of the cell membrane called a mesosome is a characteristic of prokaryotes. They are essentially infoldings of the cell membrane.