Biology : PU-CET (U.G) 2018 Panjab University Entrance Exam With Answers

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1.

Carageenans And Alginates Are Obtained Respectively From

A: Brown Algae, Red Algae

B: Red Algae, Green Algae

C: Green Algae, Brown Algae

D: Red Algae, Brown Algae

The answer is: D

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Explanation

Correct, the answer is D: Red Algae and Brown Algae.

Carrageenan is a family of linear sulfated polysaccharides that are extracted from red seaweeds, particularly from Chondrus crispus, Eucheuma cottonii, and Gigartina stellata.

Alginates are extracted from brown seaweeds, including Laminaria hyperborea, Ascophyllum nodosum, and Macrocystis pyrifera. They are composed of linear chains of α-L-guluronic acid (G) and β-D-mannuronic acid (M) residues, and can form gels in the presence of calcium ions.