Question

define proteins and lipids

Answer 1

proteins :- any of a class of nitrogenous organic compounds which have large molecules composed of one or more long chains of amino acids and are an essential part of all living organisms, especially as structural components of body tissues such as muscle, hair, etc., and as enzymes and antibodies.

Answer 2

Answer :-

Proteins :-

Proteins can be defined as one among the most important Macro-molecules in the bodies of living organisms.

• After water, proteins form the major (14%) part of the living Protoplasm.

• About 75% of the dry weight of Protoplasm is that's proteins.

• Proteins are very complex organic molecules containing Carbon , Hydrogen, Oxygen and Nitrogen as their major constituents.

• Proteins contain Sulphur, Phosphorus, Iodine and Iron as their minor constituents.

Extra Information :-

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• The term "Protien" was coined by a scientist named- "Berzelius" in the year 1837.

• In the year 1902, it was discovered that on undergoing complete Hydrolysis, complex protien molecules break down into simple amino acids.

Lipids :-

In general terms, Lipids can be defined as the esters of fatty acids with Glycerol.

• Each molecule of glycerol can react with three molecules of fatty acids.

• According to the number of fatty acids that are attached to the Triglyceride molecule, the esters are named as Monoglycerides, Diglycerides or Triglycerides.

Extra Information :-

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• Lipids are commonly known as Fats.

• Fats that are liquids at room temperature, are termed as "Oils".

• Unsaturated fatty acids have one or more double bonds between the Carbon (C) atoms of the chain ( Eg - Oleic acid).

• Essential fatty acids are also known as "Poly-unsaturated fatty acids" (Eg - Linoleic acid and Arachidonic acids).