What Is A Membrane????
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Answer:
Membrane is any delicate sheet that separates one region from other blocking or permitting (selectively or completely) the passage of substances. The skin, for example, can be considered a membrane that separates the exterior from the interior of the body; cellophane, used in chemical laboratories to separate solutions, acts as membrane too.
Cell membranes is also known as plasma membranes.it is selectively permeable membranes.
Plasmalemma Or plasma membrane lies on the outside of protoplast and separates it from external environment. Tonoplast occurs around vacuoles.
Most of the eukaryotic cell organelles have their own membrane appears trilaminar Or tripartite with a middle electron transport layer and electron dense layer on either side.
Chemically , it has proteins(60-70%), lipids (20-40% ) and carbohydrates (1-5%).
Lipids are both structural and enzymatic.
Lipids are generally phospholipid with polar hydrophilic heads.