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Secondary Structure of Proteins

The predomina...

Question

The predominant form of histamine present in human blood is $(p K_{a} Histidine =6.0$ )

A

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B

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C

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D

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Solution

The correct option is B
Structure of histamine:

Blood is slightly basic in nature $(7.35 p H)$ . At this $p H$ , terminal $N H_{2}$ will get protonated due to more basic nature .
The predominant form will be:

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