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Micelles in Milk Formation

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Questions and Answers

What is the primary reason for the formation of micelles?

The abundance of ionisable groups in the casein molecule

Hair-like protrusions (CMP)

Presence of calcium and phosphate

Hydrophobic and hydrophilic sites in the casein molecule (correct)

How many individual protein molecules typically form a micelle?

20 (correct)

What gives milk its whitish-blue tinge?

The abundance of ionisable groups in the casein molecule

Calcium phosphocaseinate bonds

Hair-like protrusions (CMP)

The presence of micelles (correct)

Which amino acids have acidic ionisable side-chains?

Aspartate, glutamate, tyrosine, cysteine Signup and view all the answers

What do micelles consist of?

Sub-micelles in which casein molecules are heterogeneously distributed Signup and view all the answers

What is often the term used to refer to micelles?

Calcium phosphocaseinate Signup and view all the answers

What is the role of κ-casein in micelles?

Protecting α-casein and ß-casein from precipitation by milk calcium Signup and view all the answers

What keeps the integrity of micelles according to the text?

Calcium phosphate bonds between sub-micelles Signup and view all the answers

What happens if Ca++ leaves the micelle?

Micelles disintegrate into sub-micelles Signup and view all the answers

What is the function of α-casein, β-casein, and κ-casein in micelles?

Protecting each other from precipitation by milk calcium Signup and view all the answers

Which factor helps maintain a balance between micelles in terms of charges?

Water held by κ-casein Signup and view all the answers

What is the role of complex salts in micelle formation?

Forming bonds within molecules Signup and view all the answers

What happens when the hydrophilic CMP tail of κ-casein is split?

The micelle loses solubility and starts to aggregate Signup and view all the answers

At what pH does casein start to form a gel, trapping liquid in capillary spaces?

pH 4.6 Signup and view all the answers

How does lowering the pH affect the stability of micellar complex?

Disrupts stability Signup and view all the answers

What is the effect of acid on the charges of casein at pH 4.6?

There is an equal number of positive and negative charges attracting each other Signup and view all the answers

How does rennin affect casein micelles?

Destabilizes them Signup and view all the answers

What happens when the colloidal calcium hydroxyphosphate in the micelle dissolves due to added acid?

Penetrates into the micelle and forms strong internal bonds Signup and view all the answers