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Question

The basic chemical unit of pectin in the middle lamella is?

A
Galacturonic acid
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B
Glucuronic acid
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C
Mannuronic acid
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D
Pectinic acid
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Solution

The correct option is A Galacturonic acid
Pectin is a complex polysaccharide consisting mainly of esterified d-galacturonic acid residues linked by α-(1–4) chain. The acid groups along the chain are largely esterified with methoxy groups in the natural product.
Thus A is the correct option.

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