Question

Which of the following casein fractions are highly phosphorylated and are responsible for calcium binding?

• A. \(\alpha_{S1}\)-casein, \(\alpha_{S2}\)-casein, and \(\kappa\)-casein
• B. \(\kappa\)-casein and \(\beta\)-caseins
• C. \(\kappa\)-casein
• D. \(\beta\)-caseins

Hint:

Phosphorylated caseins: \(\alpha_{S1}\), \(\alpha_{S2}\), \(\kappa\).
Responsible for calcium binding.
Important for micelle structure.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Casein fractions have different properties.
Phosphorylation affects calcium binding.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the properties of casein fractions.
Step 3: Detailed Explanation:
\(\alpha_{S1}\)-casein, \(\alpha_{S2}\)-casein, and \(\kappa\)-casein are highly phosphorylated.
They are responsible for calcium binding.
\(\beta\)-caseins are less phosphorylated.
Thus, the correct answer is \(\alpha_{S1}\), \(\alpha_{S2}\), and \(\kappa\)-casein.
Step 4: Final Answer:
\(\alpha_{S1}\)-casein, \(\alpha_{S2}\)-casein, and \(\kappa\)-casein are highly phosphorylated.
Hence, the correct option is (A). \bigskip