Question

A complete protein is one that possesses
A) All non-essential amino acids
B) All essential amino acids
C) All the 20 amino acids
D) All the amino acids with complex structures

Answer 1

Hint:-Essential amino acids are the ones that cannot be synthesized by the body and have to be supplied from outside. Non-essential amino acids are the ones that can be synthesized by the body and need not be supplied through the diet. There are twenty amino acids in total out of which nine are essential and eleven are non-essential.

Complete Answer:-
Histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine are essential amino acids. Proteins can be classified as complete and incomplete based on the amino acids that they contain. Incomplete proteins are deficient of one or more of the essential amino acids. While the complete proteins contain all the essential amino acids that are required by the body. These proteins have to be supplied to the body through the diet.
Usually, animal proteins are complete. Thus, to fulfil the requirements of the body and to receive all the essential amino acids, fishes, eggs and meat are the best choices as they will provide the required proportion of the essential amino acids to the body. Amino acids are required by the body for the synthesis of enzymes, proteins, nucleic acids, etc. Few plant products that also contain all the essential amino acids are buckwheat and quinoa. These are complete proteins with plants as their source.
Thus, the right option is B.

Note:- Proteins can also be classified based on their structure and their use. They are referred to as ‘the building blocks of the body’. They are required at their most during childhood. The recommended dietary allowance of proteins is 0.8 grams per day per kg of body weight.