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Algae have cell wall made up of:

1. cellulose, galactans and mannans
2. hemicellulose, pectins and proteins
3. pectins, cellulose and proteins
4. cellulose, hemicellulose and pectins

Correct answer: cellulose, galactans and mannans

Solution

Algal cell walls are often built from cellulose along with other polysaccharides such as galactans and mannans, depending on the group. This composition distinguishes them from typical higher-plant walls, which are richer in hemicellulose and pectins.

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