Question

what is a plasma membrane or cell membrane?​

Answer 1

Answer:

The cell membrane (also known as the plasma membrane (PM) or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates the interior of all cells from the outside environment (the extracellular space) which protects the cell from its environment.[1][2] The cell membrane consists of a lipid bilayer, including cholesterols (a lipid component) that sit between phospholipids to maintain their fluidity at various temperatures. The membrane also contains membrane proteins, including integral proteins that go across the membrane serving as membrane transporters, and peripheral proteins that loosely attach to the outer (peripheral) side of the cell membrane, acting as enzymes shaping the cell.[3

Answer 2

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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.