Read before you practise · 3 min
Locate N-acetylglucosamine in Cell Walls
Cell-wall composition distinguishes bacteria, cyanobacteria, fungi and wall-less Mycoplasma.
NSEB · The Living World & Biological Classification · 1 linked question · 100% coverage
Know this first
Living-system questions are solved by matching a structure or organism to its function, process and stated condition.
Structure · The part being namedFunction · What that part doesCondition · The situation that changes the answer
Study deeper: NCERT Biology · The Living World & Biological Classification
See it
Read a cell from its boundary to its working parts
Boundary
Organelle
Function
Structure → location → job
First locate the boundary, then the control or energy structure, then the organelle named in the question. Match its structure to its job.
Use the wall material as a clue
Bacterial peptidoglycan contains N-acetylglucosamine (NAG), as do cyanobacterial walls. Fungal cell walls contain chitin, which also includes NAG. Mycoplasma lack a cell wall entirely.
OlympIQ exam lens
- ✓Bacteria and cyanobacteria have peptidoglycan with NAG.
- ✓Fungal chitin contains NAG.
- ✓Mycoplasma are wall-less.
OlympIQ trap
Do not include Mycoplasma in a list of cell-wall-bearing bacteria.
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