Size, Shape, and Arrangement of Bacterial Cells Flashcards
Coccus shape
spherical
Bacillus
(Rod-shaped)
Spiral bacteria shapes
-Vibrio (curved rod-shaped, comma-shaped)
- Spirillum (spiral-shaped)
-Spirochete (helically coiled cells)
Cocci (how many)
single
Diplococci
Pairs
streptococci
chains
Staphylococci or micrococci
irregular clusters
Tetrads for cocci
Groups of four
What are the arrangements of cocci (There are 5)
-Cocci: Single
-Diplococci: pairs
- Streptococci: chains
- Staphylococci or micrococci:
irregular clusters
-Tetrads: groups of four
Arrangement of bacilli (There are 4)
-Bacilli- single
-Diplobacilli: pair of cells with ends attached
-Streptobacilli: chain of several cells
-Palisades: cells of a chain remain partially attached by a small hinge region at the ends
Spirilla is occasionally found in
short chain
Spirochetes rarely
remain attached after cell division