Question

All of the following are true about agar except it

A) liquefies at 100°C

B) is a polysaccharide derived from a red alga

C)Solidifies at approximately 40°C

D)is metabolized by many bacteria.​

Answer 1

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Agar is a mixture of two components: the linear polysaccharide agarose, and a heterogeneous mixture of smaller molecules called agaropectin. It forms the supporting structure in the cell walls of certain species of algae, and is released on boiling. These algae are known as agarophytes, and belong to the Rhodophyta (red algae) phylum.

Agar exhibits hysteresis, melting at 85 °C (358 K, 185 °F) and solidifying from 32–40 °C (305–313 K, 90–104 °F).

A) liquifies at 100°C