Everything which has been alive, and so has grown, contains protein in its cells.
However, some foods are a far better source of protein than others. Milk is a very good source of protein, and it contains all of the amino acids needed by the body. Eggs are also a complete source of protein.
A complete source of protein provides all of the amino acids needed by the body. There are eight essential amino acids which the adult human must get through food, and they are all protein variants.
Eating two foods together in the same meal can provide the essential amino acids as well. For instance, beans on toast contains every amino acid which the body cannot synthesize itself.
Nuts, pulses, meat, fish, dairy products and even vegetables are sources of protein.
I hope this helped you :)
Proteins
Proteins are in meat and various vegetables.
Milk, potatoes, tofu, legumes, beans and well that's all I know.
Foods that are high in iron and proteins include red meat, poultry, seafood, beans, lentils, tofu, nuts, seeds, and quinoa. Incorporating a variety of these foods into your diet can help ensure you are getting enough iron and protein.
Proteins are molecules that feed living organisms. There are about twenty different kinds of proteins. Proteins are found in foods.
The Biuret test allows one to test for proteins.
beans, peas, nuts, soy products, nut butters, and meat but the good kind like salmon
All unrefined foods provide proteins, including leafy green vegetables, tubers, grains, legumes, and nuts.
The "complete protein" thing is kind of a myth with regard to human nutrition. All plant foods contain complete proteins.
Animal proteins are extended by being combined with carbohydrate foods and proteins that have spare proteins. This process is called protein sparing.
Proteases
Eggs