Write a note on cell envelope and it's functions
Answers
Explanation:
cells envelope is made up of mitochondria or by two membrane
★ CELL ENVELOPE:-
→ It is is a chemically complex protective covering.
→ It is made of 3 tightly bound layers.
→ Glycocalyx: Outer layer. It differs in composition and thickness among different bacteria. It may be a slime layer.
→ Cell wall: Middle layer. Seen in all prokaryotes. It gives shape to the cell and provides a structural support to prevent the bacterium from bursting or collapsing.
→ Plasma membrane:- Inner layer. It is semi-permeable in nature and interacts with the outside. This is structurally similar to that of the eukaryotes.
→ Based on the types of the cell envelopes and response to gram staining, bacteria are 2 types:-
o Gram positive:- They take up and retain the gram stain.
o Gram negative:- They do not retain the gram stain.