Generally a protein molecule consists of around 20 essential amino acids.
complete proteins
First Class protein or complete proteins are those which have all the essential amino acids. They are usually animal proteins, though soya beans are also complete.
There are two groups of protein. Proteins from animal foods contain all the essential amino acids in the proportions required by the body they are therefore known as "complete" or 1st class protein. Protein from plants do not always contain all the essential amino acids, and are known as "incomplete" or 2nd class proteins.
Amino acids
Foods such as meat, fish, eggs and dairy products contain all the essential amino acids. However plant sources of protein only contain a few of the amino acids needed.
The term "complete protein" refers to amino acids, the building blocks of protein. A protein must contain all nine of these essential amino acids in roughly equal amounts.
I believe hemp seeds contain all 9 amino-acids.
No. Almost all vegetarian foods have a variety of amino acids.
amount
Yes, as do all plants.
Our body needs twenty two amino acids and can manufacture some of it. There are some amino acids that cannot be manufactured by our body and therefore must be obtained from our diet. Proteins contain combinations of different amino acids.Some of them contain all amino acids required by the body
Not all plants contain the "essential" (for us) amino acids.