What are the 3 basic morphological shapes of bacterial cells?
There are three basic shapes of bacteria: coccus, bacillus, and spiral. Based on planes of division, the coccus shape can appear in several distinct arrangements: diplococcus, streptococcus, tetrad, sarcina, and staphylococcus. The bacillus shape can appear as a single bacillus, a streptobacillus, or a coccobacillus.
What are the different morphology of bacteria?
Bacteria are complex and highly variable microbes. They come in four basic shapes: spherical (cocci), rod-shaped (bacilli), arc-shaped (vibrio), and spiral (spirochete) (Figure 1.3(A)).
How do spirochetes and spirilla differ?
Spirochetes have a rigid, corkscrew shape while spirilla are helical and more flexible. Spirilla have an external flagella but spirochetes have axial filaments. The cell walls of bacteria are responsible for the shape of the bacteria and the difference in the Gram stain reaction.
What is cells morphology?
Cell morphology describes the shape, structure, form, and size of cells. Studies show that cells isolated from multicellular structures (tissues, organs) and cultured as monolayers, change their morphology from e.g. spherical to spindle-like, elongated shapes.
What protects bacteria from being Phagocytize?
Capsules can protect a bacterial cell from ingestion and destruction by white blood cells (phagocytosis). While the exact mechanism for escaping phagocytosis is unclear, it may occur because capsules make bacterial surface components more slippery, helping the bacterium to escape engulfment by phagocytic cells.
How are spirochetes and spirilla different quizlet?
Spirilla are spiral prokaryotes that are relatively short and rigid, while spirochete are spiral prokaryotes that contain longer and more flexible cells which cause Lyme disease and syphilis.
What kind of cell arrangement does a cocci have?
Arrangement of Cocci. Cocci bacteria can exist singly, in pairs (as diplococci ), in groups of four (as tetrads ), in chains (as streptococci ), in clusters (as stapylococci ), or in cubes consisting of eight cells (as sarcinae).
How big is a spirochete in microns?
Spirochetes are long, thin, flexible, spirally coiled helical bacilli. These motile, gram-negative bacilli are classified into eight genera primarily on the basis of habitat, pathogenicity, phylogeny, morphological and physiological characteristics. These long slender bacteria are only a fraction of a micron in diameter but 5 to 250 microns long.
What’s the difference between a Bacilli and a spirilla?
Bacilli (or bacillus for a single cell) are rod-shaped bacteria. Spirilla (or spirillum for a single cell) are curved bacteria which can range from a gently curved shape to a corkscrew-like spiral. Many spirilla are rigid and capable of movement.
How are Spirochaetales different from other bacterial families?
The order Spirochaetales includes two families of spiral bacteria, Spirochaetaceae and Leptospiraceae. DIfferentiation of the genera within the family is based on the number of axial fibrils, the number of insertion disks present and biochemical and metabolic features.