A. What are the biochemical molecules that make up lipids and what is their arrangement in...

A. What are the biochemical molecules that make up lipids and what is their arrangement

in biological membranes?

B. Which is the other biopolymer associated with membranes? Explain with a sketch the different forms of this biopolymer in the membrane.

Expert Solution

A. Phospholipids are the repeating units of biomembranes. One molecule of phospholipid is made up of one phosphate group and glycerol esterified to one to three molecules of saturated or unsaturated fatty acids.

Phosphate group is present towards the extra- and intracellular surface of the membrane and interacts with the aqueous phase.

Fatty acids are present towards the inner side of the membrane and forms the hydrophobic fatty acid core.

B. Proteins are also present in biological membranes apart from phospholipids. There are two proteins -

Intrinsic	Extrinsic
Transmembrane proteins	Peripheral proteins
Span throughout the membrane	present at either extracellular or intracellular surface of the membrane
Example, receptors meant for transportation of molecules	Example, enzymatic in functions

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gladiator answered 2 years ago

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