The smallest known living cells, which completely lack a cell wall, are:
ASporozoans
BMycoplasma
CEuglenoids
DChrysophytes
Answer & Solution
Correct answer: B. Mycoplasma
1. They can survive without oxygen.
2. Mycoplasma lack a cell wall entirely.
3. Many are pathogens of animals and plants.
_Source: syllabus Biology, Chapter 2, Biological Classification._
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