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Question

Agar obtained from red algae is

A
made up of cellulose
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B
a heteropolymer
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C
an oligosaccharide
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D
a homopolymer
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Solution

The correct option is C a heteropolymer
Agar, obtained from the red algae Gelidium and Gracilaria is a heteropolysaccharide made up of two different units - galactose and 3,6-anhydro-L-galactopyranose.

Cellulose is a structural homopolymer made of glucose units.
A homopolymer is a polysaccharide made of only one type of monomer unit.
Oligosaccharides are carbohydrates with 3-10 monosaccharide units. An example is a stachyose which has 4 monosaccharide units - one glucose, two galactose and one fructose unit.

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