Microbiology Exam 1 Flashcards
Microbiology
scientific study of microorganisms & their effect on other living organisms; literally, the study of small life.
Divisions of Microbiology
Bacteriology Rickettsiology Virology Protozoology Mycology
Bacteriology
study of bacteria;
Rickettsiology
study of rickettsia
Virology
study of viruses,or viral diseases
Protozoology
study of protozoa *the smallest form of animal life
Mycology
study of fungi (yeasts & molds)
Bacteria
a prokaryotic one-celled mircoorganism of the Kingdom Monera, existing as free living organisms or parasites, multiplying by binary fission and having a large range of biochemical properties staph., strept., infections
Mycoplasmas
bacteria of the Mycoplasma genus that are found in humans have no cell wall; the smallest free-living organisms; size between viruses & bacteria, famous in humans for causing an infection called primary atypical pneumonia;
Rickettsia
a genus of gram-negative, pathogenic, intracellular parasitic bacteria, febrile infections (named for person discovering it Sr. Anthony Ricketts) Could run a fever of 107 degrees-Rocky Mountain Spotted Feverfebrile infections, mostly spread by insect; ex. typhus fever The infection accompanying these is high fever and last a longer period of time. Flea born or rat also transmitted by louse or lice
Chlamydia
a large group of nonmotile, gram negative intracellular parasites; parrot fever, NGU (non gonococcal urethritis) leading sexually transmitted disease
Viruses
smallest microorganism know; measles, mumps, flu, hepatitis, smallpox must use an electron microscope to see virus/ virus cannot live alone *this is the smallest microorganism known to man.
Protozoa
smallest form of animal life, malaria, amebic dysentery one celled organisms of the Kingdom Protista-most are unicellular although some are colonist
Fungi
yeast and molds; athlete’s foot, thrush, PCP, a group of diverse and widespread unicellular and multicellular organisms lacking chlorophyll, usually bearing spores and often filamentous
Prion
small proteinaceous infectious agents (particles) which almost certainly do not have a nucleic acid genome and therefore resist inactivation by procedures that modify nucleic acids.(Ex: Creutzfeldt-Jakob (CJ) )
Which family or group of microorganisms cause the greatest majority of infection in man?
Bacteria
Morphology
study of external structure and form without regard to its function
Taxonomy
classification or naming of all living things
Dimorphism
ability to exist in either one cell or multi cell form
Phagocytosis
Cell ingestion, white blood cells destroy foreign objects
Virulence
likelihood disease causes infection to human from a microorganism; relative power of an organism to produce disease
Micron (L)
largest unit of measure 25,000 of an inch
Nanometer (M)
medium unit of measure 250,000 of an inch
Angstrom (S)
smallest unit of measure 2.5 millionth of an inch
what are the 3 main shapes of bacteria?
- Spherical
- Rod
- Spiral
Coccus (pl. Cocci)
spherical (round) or ovoid shaped bacteria
Bacillus (pl. Bacilli)
rod (capsule) shaped bacteria
Spirillum (pl. Spirilla)
spiral shaped bacteria
Vibrio
(L. to move rapidly, vibrate) a genus of spiral bacteria which are curved or bend rods that resemble commas Example: Cholera
Spirillum
a genus of spiral bacteria having a snake shape with a rigid cell wall and hair-like projections called flagella that assist in movement;
Spirochete
a genus of bacteria having a flexible cell wall but no flagella in the traditional sense. Movement in these organisms occurs by contractions (undulating) of long filaments (endoflagella) that run the length of the cell; corkscrew shaped bacteria (Syphilis)
What are the 3 arrangements of Cocci
- Diplococci
- Staphylococci
- Streptococci
Diplococci
pairs meaning only 2; a variation of round shaped bacteria
Staphylococci
a genus of gram positive, nonmotile, opportunistic bacteria which tent to aggregate in irregular round clusters; bunches like grapes
Streptococci
spherical shaped bacteria occurring in chains-
What are the 2 arrangements of Bacilli
- Diplobacilli
2. Streptobacilli
Diplobacilli
a double bacillus, two being linked end to end. Morax-Axenfeld bacillus a cause of conjunctivitis is typical of this form.