NURSING ANM AND GNM

NURSING EXAM QUESTIONS

BIOCHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the isoelectric point?
A
The pH in which the amino acid is a zwitterion ion a
B
The resultant electrostatic charge is equal to 0
C
The pH in which the amino acid is a zwitterion ion and the resultant electrostatic charge is equal to 0
D
The pH in which the amino acid is a zwitterion ion and the resultant electrostatic charge is equal to 5
Explanation: 

Detailed explanation-1: -At pH = 5.02, the pH = pI so the amino acid will exist as the zwitterion with both the positive and negative charges as shown above.

Detailed explanation-2: -At a certain pH of the medium called an isoelectric point of an -amino acid, the Zwitterion behaves as neutral and does not migrate to any electrode on passing current. The isoelectric points are in the pH range of 5. 5 to 6.

Detailed explanation-3: -The particular pH at which a given amino acid exists in solution as a zwitterion is called the isoelectric point (pI). At its pI, the positive and negative charges on the amino acid balance, and the molecule as a whole is electrically neutral.

There is 1 question to complete.