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Micro-Unit 1
Chapters 1/10/3/4
55
Microbiology
Undergraduate 2
05/31/2011

Additional Microbiology Flashcards

 


 

Cards

Term
Microbiology
Definition
The study of small life
Term
Why is a knowledge of microbiology important?
Definition
  • [image][image][image][image]knowledge of microorganisms
  • allows humans to prevent food spoilage & disease occurance
  • led to aseptic techniques to prevent contanimation in medicine and microbiology labs
  • helps us to read/understand lab reports so that we can better assist Dr. & patients & protect ourselves as nurses
Term
Bacteriology
Definition
study of bacteria
Term
Mycology
Definition
study of fungi
Term
Parasitology
Definition
study of protozoa and parasitic worms
Term
Immunology
Definition
study of host defenses
Term
Virology
Definition
study of viruses
Term

Recombinant DNA technology

or genetic engineering

Definition
involves microbial genetics and molecular biology
Term
Leeuwenhoek
Definition
first described live microorganisms
Term
Pasteur
Definition
  • discovered relationship between microbes & disease, immunity and antimicrobial drugs
  • Ended the debate over Spontaneous Generation
  • demonstrated that spoilage bacteria could be killed by heat (pasteurization is the application of a high heat for a short time)
Term
Lister
Definition
  • showed that microbes are in the air and can spoil food and cause diseases
  • used a chemical disinfectant to prevent surgical wound infections
Term
Koch
Definition
proved that a bacterium causes anthrax and provided the experimental steps, Koch's postulates, to prove that a specific microbe causes a specific disease
Term
Jenner
Definition
inoculated a person with cowpox virus, who was then protected from smallpox
Term
Describe  activities of microbes that benefit human welfare.
Definition
  • Microbial Ecology- bacteria recycle carbon, nutrients, sulfu & phosphorus that can be used by plants & animals
  • Bioremediation- Bacteria degrade organic matter in sewage, bacteria degrade or detoxify pollutants such as oil and mercury.
  • Biological Insecticides- microbes that are pathogenic to insects & alternatives to chemical pesticides (Bacillus thuringiensis)
  • Biotechnology- the use of microbes to produce foods and chemicals
  • Biotechnology- recombinant DNA technology enables bacteria and fungi to produce a variety of proteins including vaccines and enzymes
Term
Define Binomial Nomenclature and discuss it's purpose
Definition

(genus + specific epthet)

can be used world wide

Term
Domain Bacteria
Definition
  • Prokaryotes- single cells with no defined nucleus
  • Peptidoglycan cell walls
  • Divide by binary fission
  • use organic chemicals, inorganic chemicals or photosynthesis for energy
Term
Domain Archaea
Definition
  • Prokaryotic
  • Lack peptidoglycan
  • Live in extreme environments
  • Include-
  • Methanogens
  • Extreme Halophiles
  • Extreme thermophiles
Term
Domain Eukarya
Definition
  • eukaryotic cells which have a defined visible nucleus and divide by mitosis
  • Kingdoms
Term
Kingdom Animalia
Definition
multicellular, no cell walls, chemoheterotrophic
Term
Kindom Plantae
Definition
Multicellular, cellulose cell walls, usually photoautotrophic
Term
Kingdom Fungi
Definition
Chemoheterotrophic, unicelular or multicellular, cell walls of chitin
Term
Kingdom Protista
Definition
A catch all for eukaryotic organisms that do not fit other kingdoms- protozooans
Term
What is meant by bacterial strains and types?
Definition

Variations within a species are called:

 

Types- usually a serological designation

Strains- usually a biochemical or morphological

Term
Cite the characteristics of viruses
Definition
  • Acellular- not cells
  • Consist of DNA or RNA core
  • Core is surrounded by a protein coat- capsid
  • Coat may be enclosed in a lipid envelope
  • Viruses are replicated only when they are IN a living host cell- obligate intracellular paracites
Term
Atrichous
Definition
lacking flagella
Term
Peritrichous
Definition
flagella distributed all over the cell
Term
Polar
Definition

at one or both poles or ends of a cell

 

Term
Monotrichous
Definition
a single flagellum at one pole
Term
Lophotrichous
Definition
A tuft of flagella coming from one pole
Term
Amphitricous
Definition
flagella at both poles of the cell
Term
What size diameter do most bacteria come in
Definition
.2-2.0 micrometers
Term
What are the basic shapes of a bacterial cell?
Definition

coccus

bacillus

spiral

Term
Name the Cocci & describe
Definition

diplococci (pair)

streptococci (chainlike)

tetrads (4)

sarcinae (cubelike groups of 8)

staphylococci (grapelike clusters)

 

Term
Name and describe the Bacilli
Definition

Diploblaccilli (2)

Streptobacilli (chains)

coccobacilli (look like cocci & are rare)

Term
Name & describe Spiral bacteria
Definition

Vibrios (curved rods)

Spirilla (helical shape & rigid)

spirochetes (helical & flexible, have an axial filament for movement)

Term
Glycocalyx
Definition

sugar coating surrounding cells

viscous & sticky

 

Term
Capsule
Definition
  • The glycocalyx that is organized and firmly attached to the cell wall
  • Determined by gram staining
  • Used for protection against phagocytes
  • formation of biofilms come from this layer
Term
Slime Layer
Definition
when glycocalyx is unorganized and only loosely attached to the cell wall
Term
Plasma Membrane
Definition
  • Found in all bacterial cells
  • made up of phospholipids & proteins
  • no carbs & usually no sterols
  • used for transport of chemicals in and out of cell & carries out functions concerning cellular respiration and other enzymatic activities
Term
Axial Filaments
Definition

Only found in spirochetes

anchored at one end of a cell

rotation causes movement (think corkscrew or barber pole)

Term
Fimbriae
Definition
  • can occur at the poles or be evenly distributed over a bacterial cell
  • a few to several hundred per cell
  • adhere to each other and surfaces

 

Term
Pili (Pilus- sing.)
Definition
  • longer than fimbriae
  • only 1 or 2 per cell
  • involved in motility & DNA transfer
Term
Peptidoglycan
Definition
  • Composition of a bacterial cell wall
  • Polymer of disaccharide (NAG & NAM are connected & alternate) The chains are bonded by peptides
Term
Gram Positive Cell wall
Definition

thick, rigid layer of peptidoglycan

contain teichoic acid (look like a long, black hair)

"built like a wall"

Term
Gram Negative Cell Wall
Definition
  • Thin layer of peptidoglycan & outer membrane on wall
  • periplasm forms between the outer membrane & plasma membrane, making it hard to get antibiotics through
  • peptidoglycan is bonded to lipids in the outer membrane
  • "Built like a patio"
Term
Atypical Cell Walls
Definition
  • Acid-fast cell walls with no outer membrane
  • contains waxy lipid bound to the peptidoglycan, making it resistent to drying
  • Mycobacterium (TB) & Nocardia are examples
Term
Name the Appendages of a cell
Definition

Flagella

Axial Filaments

Fimbriae

Pili

Term
Antigenic
Definition

Induces an immune response in a host

(our body will view it as foreign and threatening)

Term
Name the Surface Layers of a Bacterial Cell
Definition

Capsule (in some)

Cell Wall (in most)

Plasma Membrane (in all)

Term
Name the Cytoplasmic Structures
Definition

Nucleoid

Plasmid

Ribosomes

Inclusion

Endospores

Term
Nucleoid
Definition
  • singular piece of double stranded DNA
  • controls all activities of cell
  • DNA--->RNA--->Protein
  • DNA--->DNA (replicates for reproduction)
Term
Plasmid
Definition
  • small extra chromosmal piece of circular DNA 5-100 genes long
  • for adaptation- can carry genes for drug resistance used in recombinent DNA technology
Term
Ribosomes
Definition
  • RNA and protein (70S)
  • site of protein synthesis (RNA--->protein)
Term
Inclusions
Definition
  • phosphate granules, starch, lipid, sulfur
  • used for storage
Term
Endospores
Definition
  • condensed, dormant cell stage containing all vital cell components
  • survival is key function
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