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

Galacturonic acid

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Glucuronic acid

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Mannuronic acid

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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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