Question

Casein is a protein present in milk , which group of protein is associated with casein
A)Nucleoprotein
B)Chromoprotein
C)Phosphoprotein
D)Glycoprotein

Answer 1

Hint: Casein is generally a positively charged protein that flocculates in acidic media including wine. It is also a chief protein found in milk.

Complete answer:
Casein is the main protein in milk and the important ingredient of cheese. In unadulterated form, it is an amorphous white solid, tasteless and odourless compound. Whereas it’s commercial category is yellowish in colour with a pleasing odour. Cow’s milk has about 3 percent casein.

Dry casein remains good if protected from insects and rodents damp. Casein is promptly attacked by molds and bacteria and will get a disagreeable odour. Casein is generally a mixture of phosphoproteins of contradictory molecular weight.
Casein is a lyophilic colloid which is similar to albumin and gelatin. It is isoelectric pH of about 4.6 at the same time its solubility in water is but 0.01 percent. It is amphoteric when it is below pH 4.6 casein forms fairly soluble salts such as casein chloride. And above the pH 4.6 casein forms salts with bases. Caseinates easily forms gels when gradually coagulated from concentrated solutions. Formaldehyde forms a compound with casein which is insoluble. Casein is generally insoluble in the majority of the organic solvents. Para casein is not as much of lyophilic but or else identical with casein.

Casein is a family of associated phosphoproteins. These proteins are usually found in mammalian milk, composed of casein in 80 percent of the proteins in cow's milk and in between 20 percent and 45 percent of the proteins in human milk. Sheep and buffalo milk have a much higher casein content than other kinds of milk with that of human milk which have for the most part have a low casein content.
Casein has a vast range of uses. It is an important component of cheese to make use of as a food additive. The mainly known form of casein is sodium caseinate. In milk casein take part phase separation to form colloidal casein micelles which is a type of secreted biomolecular condensate.
As a food source, casein supplies amino acids, carbohydrates, and two essential elements including the calcium and phosphorus.

Hence, the correct answer is option (C)

Note: Casein is a slow digesting protein that people generally take as a supplement. People often do this before going to bed so that it helps in reducing the muscle breakdown.