on the basis of chemical structure and solubility: globular protein; albumin;globulin;proalamines and histones
on the basis of functions: structural protein;enzymes and catalyst protein;transport protein,hormonal p.; contractile p.; storage p.; genetic p.; defence p.; and receptor protein.
There are four classes of proteins:
1. Primary
2. Secondary
3. Tertiary
4. Quatenary
There are structural, defensive, hormonal, enzymatic, motor, storage, transport, and receptor proteins.
enzymesOther contributors have said "What kinds of proteins are needed for most cellular activities?" is the same question as "Which kinds of proteins are needed for most cellular activities?"good job answers.com
There are two kinds of proteins in a cell membrane: peripheral PROTEINS OR trans membrane proteins. Cell membranes are able to perform various functions only because of different membrane protein functions. Most of the membrane proteins have alpha helix structure.
Enzymes
There are 20 (common) amino acids. These are the monomers which form proteins.
A phosphate group and a lipid (to form a phospholipid).
There are 20 different kinds of monomers in proteins, called amino acids.
enzymesOther contributors have said "What kinds of proteins are needed for most cellular activities?" is the same question as "Which kinds of proteins are needed for most cellular activities?"good job answers.com
Proteins are molecules that feed living organisms. There are about twenty different kinds of proteins. Proteins are found in foods.
enzymesOther contributors have said "What kinds of proteins are needed for most cellular activities?" is the same question as "Which kinds of proteins are needed for most cellular activities?"good job answers.com
Carbohydrates, fats, proteins, vitamins, minerals, etc. Are all considered nutrients.
thousands of different proteins
All of them do, there are so many and they all contain differnet amounts of proteins. Buckwheat, Amaranth and Spring Wheat probably contain the highest amounts of Full Spectrum of Amino Acids
There are two kinds of proteins in a cell membrane: peripheral PROTEINS OR trans membrane proteins. Cell membranes are able to perform various functions only because of different membrane protein functions. Most of the membrane proteins have alpha helix structure.
All proteins contain carbon, hydrogen, nitrogen, and oxygen. Many also contain sulfur, and cofactors can have all kinds of wacky stuff in them, like iron, manganese, cobalt, you name it.
About 5000
Almost all enzymes are proteins; there are only a few exceptions to this rule, including certain kinds of RNA. Enzymes are necessary for important biological processes necessary for life, including digestion.
Enzymes