Bacterial Cell Structure

Infectious diseases involve the study of microbiology fundamentals.

Bacterial Cell Structure

• Size Comparison:
    - Human cells: 50-100 microns;
    - Bacterial cells: 0.5 microns.

Basic Features of Bacterial Cells

• Cell Membrane: Bacterial cells are bounded by a cell membrane; some may have additional membranes.

• Cytoplasm: Contains ribosomes.

• Nuclear Structure: No membrane-bound nucleus; genetic material is typically a single chromosome in a nucleoid structure.

• Ribosomes: Present in cytoplasm.

Locomotion in Bacteria

• Flagella: Enable movement in liquid environments.

Capsule and Glycocalyx

• Presence: Capsules are not universal among bacteria but serve essential functions.

• Composition: Made of polysaccharides and proteins.

• Functions: Aid attachment, colony formation, and moisture retention; essential for pathogenicity.

Fimbriae

• Structure and Function: Hair-like structures that facilitate surface attachment, critical for infections.

Summary of Bacterial Movement

• Flagellum: Facilitates locomotion in rod-shaped bacteria, enhancing metabolism and pathogenic potential.