Identify the incorrect statement.

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(D) The correct answer is $D$. $A$: Cyanobacteria (blue-green algae) are photosynthetic prokaryotes that lack flagella throughout their life cycle. Th

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Pili and fimbriae are involved in the motility of bacterial cells.

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(D) The correct answer is $D$. $A$: Cyanobacteria (blue-green algae) are photosynthetic prokaryotes that lack flagella throughout their life cycle. This statement is correct. $B$: Mycoplasma are the smallest known living cells and they completely lack a cell wall,making them resistant to many antibiotics. This statement is correct. $C$: The cell wall of bacteria is made up of peptidoglycan (murein). This statement is correct. $D$: Pili and fimbriae are surface structures of bacteria. Pili are involved in conjugation (transfer of $DNA$),and fimbriae are involved in attachment to rocks or host tissues. Neither of these structures is involved in motility. Flagella are the primary structures responsible for bacterial motility. Therefore,this statement is incorrect.

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