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(a)i) Proteins
These are compounds of carbon, hydrogen and oxygen. In addition, they also contain nitrogen and sometimes phosphorous or sulphur or both. Some proteins molecules contain other elements. In particular, haemoglobin contains iron.
Proteins are made up of amino acids. There are about twenty known amino acids.
ii) Amino acids are of two kinds:
a) Essential- These are those amino acids that cannot be synthesized by the body systems hence have to be supplied in the diet.
b) Non essential- These are amino acids that can be synthesized by the body mechanisms hence do not need to be supplied in the diet.
An amino acid has an amino group, carboxyl group, hydrogen atom and an alkyl, R group. Amino acids differ from each other by the alkyl group.
iii) Proteins are of two kinds:
a) First class proteins- Contain all essential amino acids
b) Second class proteins- Proteins lack one or more essential amino acids
Anganifelix answered the question on May 9, 2018 at 17:00
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