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Globulins contained in human blood plasma are primarily involved in defence mechanism of body. Globulin is one of the two types of serum proteins, the other being albumin. Globulins can be divided into three fractions based on their electrophoretic mobility.

1. Globulins are involved in the body's defence mechanism.
2. Globulins are one of the two types of serum proteins.
3. Globulins can be divided into three fractions.
4. All of the above.

Correct answer: All of the above.

Solution

Each statement is correct: globulins help in defense, they are one of the two main serum protein groups along with albumin, and they are classified into three electrophoretic fractions. Therefore, the option that includes all three true statements is correct.

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