Question

Algae have cell walls made up of
A. Hemicellulose, pectins, and proteins
B. Pectins, cellulose, and proteins
C. Cellulose, hemicellulose, and pectins
D. Cellulose, galactans, and mannans

Answer 1

Hint: Algae are eukaryotic organisms that have different chemical components in their cell walls such as polysaccharides and glycoproteins.

Complete answer: Algae is a large morphologically diverse group that occupies every habitat on this planet. Their extracellular coverings or cell wall is so diverse.
The algal cell walls is an assemblage of polymers which are similar to cellulose, pectins, hemicellulose, and arabinogalactan proteins.
Algae produces complex polysaccharides that form multilayer thick fibrillar cell walls.
They also contain agar in their cell walls that are absent in land plants.
Cell wall contains polysaccharides and glycoproteins such as carrageenan, cellulose, hemicellulose, pectins, and agar.
Different molecules in the cell wall interact and produce properties that allow distinguishing certain classes of algae.

Hence, the correct option is (C) Cellulose, hemicellulose, and pectins.

Note: In most of the classes of algae, cellulose is the main structural component of the cell wall. In some classes of algae cell wall have dispersed structures while others have a higher degree of organization. There is no clear distinction between primary and secondary cell walls of algae.