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Difficulty: EasyKingdom Monera: Bacteria and Cyanobacteria

Match each cellular structure or cell type of Kingdom Monera listed on the left with its correct function or description on the right.

  • PeptidoglycanRigid structural component of the bacterial cell wall
  • HeterocystSpecialized cell in cyanobacteria responsible for nitrogen fixation
  • FlagellumHair-like appendage used by motile bacteria for locomotion
  • Nucleoid (Circular DNA)Region containing naked genetic material without a surrounding nuclear membrane

Answer

Peptidoglycan matches with the rigid structural component of the bacterial cell wall; Heterocyst matches with the specialized cell in cyanobacteria responsible for nitrogen fixation; Flagellum matches with the hair-like appendage used by motile bacteria for locomotion; Nucleoid (Circular DNA) matches with the region containing naked genetic material without a surrounding nuclear membrane.
Peptidoglycan provides rigidity to bacterial cell walls. Heterocysts are specialized cyanobacterial cells dedicated to nitrogen fixation. Flagella drive motility in motile bacteria. The nucleoid region contains naked circular prokaryotic DNA without a nuclear membrane.

Step-by-Step Solution

1
Identify the primary chemical component of the bacterial cell wall.
Peptidoglycan (murein) provides structural support and rigidity to bacterial cell walls.
Bacterial cell walls are uniquely composed of peptidoglycan rather than cellulose or chitin.
2
Determine the specialized role of heterocysts in filamentous cyanobacteria.
Heterocysts create an anaerobic environment for the enzyme nitrogenase to fix atmospheric nitrogen.
Cyanobacteria such as Anabaena utilize heterocysts to convert nitrogen gas into biological forms.
3
Associate bacterial motility structures with their primary function.
Flagella act as locomotory organelles propelling bacteria through fluids.
Bacterial movement is primarily achieved via rotary motion of flagella.
4
Recall the organization of prokaryotic genetic material.
Monerans possess naked circular DNA localized in the nucleoid without a nuclear envelope.
The absence of a true nucleus defines prokaryotic cellular architecture.

Key Concept

Cellular structures and specialized functional adaptations in Kingdom Monera (Bacteria and Cyanobacteria)
Estimated Time:45s
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Topics

Kingdom Monera: Bacteria and Cyanobacteria

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