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In Whittaker's system, what is the cell wall of kingdom 'Monera' organisms made of?

Answer and explanation

Correct answer: Peptidoglycan (non-cellulosic)

Direct answer: B is correct. Kingdom Monera in Whittaker’s system mainly includes bacteria, which are prokaryotic organisms. The bacterial cell wall usually contains peptidoglycan, also called murein, a mesh-like material made from sugars and short peptide chains. This makes the wall non-cellulosic. A is wrong because cellulose is characteristic of the cell walls of plants and many algae. C is wrong because chitin is characteristic of fungal cell walls and also occurs in the exoskeleton of many arthropods, not as the usual bacterial wall material. D is wrong because most bacteria have a cell wall, although some special bacteria may lack one or have unusual wall features. For the school-level general rule, remember: bacteria—peptidoglycan, plants—cellulose, fungi—chitin. This three-way comparison prevents a common confusion.

Related tags

MoneraWhittaker ClassificationPeptidoglycanBacterial Cell WallBiodiversityAnd Classification SystemsBiodiversity And Classification SystemsThe Living WorldBiology

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