Practice question

MCQ

Question

Two cell-wall samples are chemically analysed:
Sample P contains cellulose, galactans, mannans and calcium carbonate.
Sample Q contains cellulose, hemicellulose, pectins and proteins.
Which interpretation is most appropriate?

Options

Choose one · Correct answer highlighted

P is a bacterial wall, while Q is a plasma membrane. P is a fungal wall, while Q is a bacterial glycocalyx. P is a secondary wall, while Q is a middle lamella composed mainly of calcium pectate. P is consistent with an algal cell wall, while Q is consistent with the wall of other plants. Correct

Explanation

Algal walls may contain cellulose, galactans, mannans and minerals such as calcium carbonate. In other plants, the wall is composed of cellulose, hemicellulose, pectins and proteins.

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Two cell-wall samples are chemically analysed: Sample P contains cellulose, galactans, mannans and calcium carbonate. Sample Q contains cellulose, hemicellulose, pectins and proteins. Which interpretation is most appropriate?