FINAL!!!! Flashcards
What is the definition of microbiology?
specialized area of biology that deals with living things too small to be seen with the naked eye.
What is the study of bacteria?
bacteriology
what is the study of vises?
virology
what is the study of fungi?
mycology
what is the study of algae?
phycology
what is the study of protozoa?
protozoology
what is the study of helminths?
parasitology
what is bacteria measured in?
micrometers
what are viruses measured in?
nanometers
what is spontaneous generation?
living things appear from nonliving matter
what is biogenesis?
living things arise from other living things of the same kind
What did Anthony van Leeuwenhoek contribute to microbiology?
Invented the first handheld microscope.
Father of bacteriology and protozoology
What did Louis Pasteur contribute to microbiology?
- disproved spontaneous generation
- pasteurization
- germ theory of disease
What did Robert Koch contribute to microbiology?
- verified germ theory of disease
- Koch’s postulates
- developed lab techniques
what etiological agent did Robert Koch use in his experiments?
Bacilus anthracis (anthrax)
what is a pathogen?
an organism that can cause disease in a normal healthy individual
what is normal flora?
microbes that normally live in or on a human and do not normally cause disease
what is taxonomy?
formal system for organizing, classifying and naming living things
what is the order of the taxa?
Did Popeye come over for green spinach Domain Kingdom Phylum Class Order Family Genus Species
What is the domain bacteria?
prokaryotic; true bacteria
what is domain archaea?
prokaryotic; bacteria that lives in extreme environments
what is domain eukarya?
eukaryotic; has a nucleus and organelles
what are the five I’s?
Innoculation Incubation Isolation Inspection Information gathering Identification
what is inoculation?
introduce bacteria into media using a loop or needle
what is incubation?
heating the media at 37 degrees allowing bacteria to grow
what is isolation?
isolate a single colony to obtain a pure culture
what is a pure culture?
one microbe growing on the culture media
what is a mixed culture?
more than one microbe growing on the culture media
what are the three types of media?
liquid
semisolid
solid
which type of media has the most agar?
solid
where is agar derived from?
red algae gelidium
who first used agar?
fanny hesse robert koch’s assistant’s wife
what is the difference between simple and differential stains?
a simple stain only uses one dye and distinguishes cell shape arrangement and size. Differential uses two dyes and distinguishes cell types or parts
What is the primary stain?
first stain you use
what is a counter stain?
the second stain you use
what stain did hans christian gram invent?
the gram stain
who developed the petri dish?
richard petri
What are the three basic bacterial shapes?
coccus
bacillus
spiral or curved shape
what is the atypical shape?
pleomorphic rods
what are pleomorphic rods?
cells of the same species vary in shape and size
what are the three spiral shapes?
vibrio
spirillum
spirochete
what is vibrio?
comma shaped
what is spirillum?
rigid spiral or helix shape. Cells do not bend; amphitricious
what is spirochette?
flexible spring shape; endoflagella
what is a single coccus?
single round cell
what is diplococcus?
two round cells
what is streptococcus?
chain of round cells
what is staphylococcus:?
cluster of round cells
what is a tetrad?
packet of four round cells
what is a sarcina?
cube of 8 or 16 round cells
what is a single bacillus?
one oblong cell
what is a diplobacillus?
two oblong cells
what is a streptobacillus?
chain of oblong cells
what is a palisade?
match sticks or picket fence of oblong cells
Motile bacteria will
flip, rotate, and go straight (run and tumble)
Non motile bacteria will:
vibrate (Brownian’s movement)
what are fimbriae?
many short hairs used for attachment to the environment
what are pili?
a single, long, hollow appendage used for attachement to another bacteria to exchange DNA during conjugation
What is comprised of the cell envelope?
cell wall
cell membrane
what is the glycocaylyx?
a coating of molecules external to the cell wall, made of sugars and proteins
Do all cells have a glycocaylyx?
no
what is the function of the glycocaylyx?
to allow cell to adhere to the environment
what is the function of the cell wall?
to determine the shape and prevent lysis due to changing osmotic pressures
what is the major molecule in the cell wall?
peptidoglycan layer
Gram positive bacteria?
thick peptidoglycan layer
teichoic acid
no outer membrane
Gram negative bacteria:
thin peptidoglycan layer
no teichoic acid
outer membrane exteranal to the cell wall
what is the cell membrane composed of?
phospholipid bilayer embedded with proteins
what is the primary function of the cell membrane?
selectively allows passage of molecules into and out of the cell
what are the two types of DNA found in the nucleoid?
chromosome
plasmid
what is a chromosome?
single, circular, double-stranded DNA molecule that contains all of the genetic information required of the cell
what is a plasmid?
Free, small, circular, double stranded DNA that is very important to bacterial resistance
what is the function of a plasmid?
genetic engineering–readily manipulated and transfered from cell to cell
what is the function of a ribosome?
it is the site of protein synthesis
what is the function of endospores?
when exposed to adverse environments, it is capable of high resistance and long term survival
what are the six environmental factors that effect microbes existance?
nutrients osmotic pressure temp pH gas other organisms
what are macronutrients?
required in large quantities and play principle roles in cell structure and metabolism
what are micronutrients?
required in smaller amounts for enzyme function and maintenece of protein structure
what are some examples of macronutrients?
carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfer
what are some examples of micronutrients?
calcium, sodium, potassium, zinc, copper, nickel
what are some examples of passive transport?
diffusion
facilitated diffusion
osmosis
what is diffusion?
net movement of solute molecules from their area of higher concentration to lower concentration
what is facilitated diffusion?
the movement of larger solute molecules from an area of higher concentration to lower concentration with the help of a transport protein
what is osmosis?
net movement of water molecules from higher concentration to lower concentration
what are some examples of active transport?
active transport and bulk transport
what is active transport?
the movement of solute molecules from an area of lower concentration to higher concentration with the help of a membrane protein pump
what is bulk transport
endocytosis and exocytosis
what is endocytosis?
phagocytosis and pinocytosis
what is phagocytosis?
cell eating
what is pinocytosis?
cell drinking
what is exocytosis?
things move out of the cell
what is a halophile?
lives in high salt environment
what is an osmophile?
lives in high concentration of several solutes
what is a psycrophile?
-15-20 degrees celcius
what is a mesophile?
10-50 degrees celcius
what is a thermophile?
45 to 80 degrees celcius
what is a hyperthermophile?
67 to 105 degrees
what is a neutrophile?
pH 6-8
what is a acidophile?
pH 0-2
what is a alkalinophile?
pH 8-11
what is an aerobe?
requires oxygen for growth
what is a microaerophile?
requires less oxygen than is found in air
what is a falcutative anaerobe?
grows with or without oxygen
what is an aerotolerant anaerobe?
does not use oxygen for growth; can tolerate oxygen
what is a strict anaerobe?
dies in the presence of oxygen
what are the four parts of the growth curve?
lag phase
exponential phase
stationary phase
death phase
what is the lag phase?
no rise in the number of cells
what is the exponential phase?
cells divide at maximun rate
what is the stationary phase?
growth=death
what is the death phase?
cell death is greater than cell growth
what is binary fission?
the bacteria’s way of asexual division
what is metabolism?
all chemical and physical workings of a cell
what are the two types of chemical reactions?
catabolism and anabolism
what is cataboliasm?
breaks the bonds of larger molecules forming smaller molecules; releases energy
what is anabolism?
synthesis; forms larger molecules from smaller molecules; requires ATP
what is the biological catalyst?
the enzyme composed of protein
what are coenzymes?
NAD and FAD
when carrying their electrons, NAD is rewritten as
NADH
when carrying their electrons, FAD is rewritten as
FADH
NAD and FAD will carry their electrons in the form of
two hydrogen atoms
what are the three paths of aerobic respiration?
glycolysis
Kreb’s cycle
respiratory chain
what are the three paths of anaerobic respiration?
glycolysis
Kreb’s cycle
respiratory chain
what are the paths of fermentation?
glycolysis
what is glycolysis?
9 chemical reactions in a branched pathway
does glycolysis need oxygen?
no
what is the starting molecule of glycolysis?
glucose
what is the product of glycolysis?
2 pyruvic acids
what is the energy used in glycolysis?
2 ATP
what is energy made during glycolysis?
4 ATP
2NADH
what is the net energy of glycolysis?
2 ATP
2 NADH
where does glycolysis occur?
the cytoplasm
what is kreb’s cycle?
9 chemical reactions occuring in a cycle pathway.
occurs in the cytoplasm
what is the starting molecule for Kreb’s?
2 pyruvic acid
what is the product of Kreb’s?
6 CO2
what is the energy used during Kreb’s?
none
what is the energy made during Kreb’s?
8 NADH
2 FADH
2ATP
what is the net energy of Kreb’s?
8 NADH
2 FADH
2 ATP
what is the electon transport chain?
linear shaped pathway that occurs in the cell membrane
what is the exchange rate for coenzymes in the electron transport chain?
1 NADH = 3 ATP
1 FADH = 2 ATP
what is the final electron acceptor for anaerobic respiration?
several possibilities but never oxygen
what is the total energy made during aerobic respiration?
38 ATP
what is the total energy made during anaerobic respiration?
less than 38 ATPs
what is the total energy made during fermentation?
small amount of ATP
does fermentation need oxygen?
no
what are some fermentative products?
sacchromyces cereviseae
lactobacillus acidopholus
acetobacterium
propionibacterium
what is sacchromyces cereviseae?
CO2+ethanol; used to make bread and adult beverages
what is lactobacillus acidophilus?
lactic acid; used to make yogurt and buttermilk
what is acetobacterium?
acetic acid; used to make dill pickles and sauerkraut
what is propionibacterium?
propionic acid; used to make swiss cheese
what DNA is replicated by rolling circle?
plasmid during conjugation
what DNA is replicated during replicon?
chromosome during binary fission
what is a spontaneous mutation?
a random change in the DNA arising from mistakes in replication
what are induced mutations?
exposure to known mutagens
what are mutagens?
any chemical or radiation that causes changes in DNA
what is a beneficial mutation?
creates an advantage for the microbe
what is a neutral mutation?
no significant change
what is a harmful mutation?
creates a disadvantage for the microbe
what is a lethal mutation?
kills the microbe
what is conjugation?
donor transfers plasmid through pilus
what is transformation?
chromosome fragements from a lysed cell are accepted by a recipient cell
who had a classic experiment with transformation?
frederick griffin
what is transduction?
involves a virus picking up a bacterial donor’s DNA and transferring it to a recipient bacterium
what is a bacteriophage?
type of virus that only affects bacteria
what is transposons?
DNA segments that have the capability of moving from one location in the genome to another (jumping genes)
who discovered transposons?
barbara mclintock
what is the hardest microbial structure to kill?
endospores
what is an anitseptic?
chemicals applied to directly exposed body surfaces to inhibit bacterial growth
what is a disinfectant?
physical process or chemical agent that kills vegetative cells but not endospores
what is a sterilant?
kills all viable microorganisms
what is a virucide?
kills or inactivates viruses
what is a bactericide?
kills bacteria but not endospores
what is a fungicide?
kills hypae, yeasts and fungal spores
what is a sporocide?
kills endospores
what is a germicide?
kills pathogenic organisms on animate and inanimate objects
what is bacteriostatic?
prevents the growth of bacteria
what is fungistatic?
prevents the growth of fungi
what are the areas of the bacterial structure on which agents can kill the microbe?
cell wall
cell membrane
nucleic acid synthesis
alter protein structure
what are the physical antimicrobial agents?
heat cold desiccation radiation filtration
what are tht two types of heat?
dry
moist
what are some examples of moist heat?
autoclaving
intermittent sterilization
pasteurization
what is autoclaving?
a type of sterilization that uses steam under pressure in a specialized chamber
what is intermittent sterilization?
a type of disinfectant created by John Tyndall where the specimen is exposed to free flowing steam over a course of three days
what is pasteurization?
involves special vats to heat liquid quickly to reduce the microbial load
what are the three methods of pasteurization?
batch
flash
ultrahigh temperature
what is boiling water?
type of disinfection that uses a bath for 30 min
what are some examples of dry heat?
dry oven
incineration
what is dry oven?
type of sterilization
2-4 hours at 150-180
what is incineration?
type of sterilization
bunsen burners or furnace incinerators
what is the cold method?
slows the gorwth of microorganisms
refrigeration and freezing
what is the dessication method?
gradual removal of water from cells
not an effective method because cells will regrow when water is reintroduced
what is the radiation method?
causes mutations
ionizing or noniionizing
what is ionizing radiation?
penetrates barriers
what is nonionizing radiation?
does not penetrate barriers
what is the filtration method?
straining liquid or air through a filter
type of sterilization
what are halogens?
chlorine
iodine
fluorine
bromine
what is chlorine?
liquid and gas used for large scale disinfectant of drinking water, swimming pools, restarants, canning, wounds and root canals
what is an example of chlorine?
chlorox
what is iodine?
iodophor
tincture iodine
aqueous iodine
what is iodophor?
betadine and povidone
what is tincture iodine?
2-3% iodine in 70% alcohol
what is aqueous iodine?
2-3% iodine in water
what is iodine used for?
skin prep, burns, vaginal infections, surgical hand scrubbing, disinfect equipment
what is fluorine?
used in toothpaste and drinking water
what is bromine?
used in hot tubs
what is phenol?
originally used by Joseph Lister. Used in antibacterial soaps and disinfectants.
what are some examples of phenol?
pHisoHex
lysol
triclisan
what is chlorohexidine?
chlorine and two phenolic rings; cleanser of choice for MRSA
what are some examples of chlorohexidine?
hibiclens
hibitane
what are alcohols?
have OH functional group. reduces microbes on skin, thermometers, hand sanitizers
what do we use to disinfect our lab tables?
70% ethanol
what is hydrogen peroxide?
colorless caustic liquid that decomposes in the presence of light or metals.
what are aldehydes?
glutaradehyde
formaldehyde
what is glutaradehyde?
yellow acidic liquid used in a chemiclave that kills endospores.
what are some examples of a glutaraldehyde?
cidex and sporacidin
what is formaldehyde?
gas that dissolves to form formalin; main ingredient in embalming fluid
what are some gaseous agents?
ethylene oxide
chlorine dioxide
what is ethylene oxide?
highly explosive gas classified as a carcinogen that sterilizes prepackaged plastic medical supplies and disinfects spices, dried fruits, and drugs
what is chlorine dioxide?
gas that was used to decontaminate the senate offices after the anthrax attacks in 2001
what are some heavy metals?
mercury, silver and zinc
what is mercury used for?
mercurochrome
merthiolate
what is mercuochrome?
monkey’s blood
what is merthiolate?
thimerosal
what is silver?
silver nitrate in newborns
siver sulfadiazine in burn patients
what is zinc?
zinc oxide in bourdeaux’s butt paste
what are the best detergents?
quaternary ammonium compounds
what is the most common detrgent?
benzalkonium chloride
what are some common soaps?
sodium lauryl sulfate
what is a chemotheraputic agent?
any chemical used in the treatment of a disease
what is an antibiotic?
metabolic product of one microorganism that inhibits or destroys other microorganism
what are the most prolific producers of antibiotics?
bacteria and molds
what are the three ways an antibiotic is produced?
natural, semisynthetic and synthetic
what are the mechanisms of action of chemotheraputic drugs?
cell wall cell membrane protein synthesis nucleic acid cytoplasm
what does penicillin consist of?
thiazolidine ring
beta-lactam ring
variable side chain
what are the primary problems of penicillin?
allergy and resistance
what are cephlasporins?
four generations that consist of a six carbon ring, beta-lactam ring, and two variable side chains
what are first generation cephlasporins?
cephalothin, cefazolin
what are first generation cephlasporins used to treat
gram-positive cocci
what are second generation cephlasporins?
cefaclor, cefonacid
what are second generation cephlasporins used to treat?
gram-negative bacteria
what are third generation cephlasporins?
cephalexin, ceftriaxone
what are third generation cephlasporins used to treat?
broad spectrum against enteric bacteria with beta-lactamases
what are fourth generation cephlasporins?
cefepime
what are fourth generation cephlasporins used to treat?
both gram negative and gram positive
what are tetracyclines?
broad spectrum drug produced by streptomyces
what are some examples of tetracycline?
doxycycline
minocycline