PRELIM 01 - Introduction to Microbiology Flashcards
The scientific study of microorganisms
Microbiology
Minute living things that individually are usually too small to be seen with the unaided eye
Microorganisms
5 types of microorganisms
Bacteria, Viruses, Fungi, Protozoa, Algae
Microbes that live stably in and on the human body
Microbiome
Other name for microbiome
Microbiota
2 types of microbiota
Normal, Transient
Microbiota that indefinitely colonize the body
Normal microbiota
Microbiota that transiently colonize the body
Transient microbiota
A viscous (sticky), gelatinous polymer that is external to the cell wall
Glycocalyx
2 types of glycocalyx
Capsule, Slime layer
Glycocalyx that contributes to bacterial virulence and protects pathogenic bacteria from phagocytosis
Capsule
Are long, filamentous appendages that propel bacteria
Flagella
The movement of bacterium toward or away from a particular stimulus
Taxis
2 types of taxis
Chemotaxis, Phototaxis
Type of taxis where the stimulus is chemicals
Chemotaxis
Type of taxis where the stimulus is light
Phototaxis
Are bundles of fibrils that spiral around the cell; structure for motility in spirochetes
Axial filaments
Other name of axial filaments
Endoflagella
Fimbriae and pili consists of a protein called __________ arranged helically around a central core
Pilin
A hairlike appendage that adheres to surfaces and present in few to several hundred per cell
Fimbriae
A hairlike appendage that is longer and fewer than fimbriae (1-2/cell) and used for motility and DNA transfer
Pili
A complex, semirigid structure that prevents bacterial cell rupture
Cell wall
Cell wall is present in all bacteria, except __________ and __________
Mycoplasma, Ureaplasma
Component of cell wall
Peptidoglycan/Murein
Meaning of NAG
N-acetylglucosamine
Meaning of NAM
N-acetylmuramic acid
Type of cell wall that has many layers of peptidoglycan, forming a thick and rigid structure
Gram-positive cell wall
Type of cell wall that has one or very few layers of peptidoglycan and an outer membrane
Gram-negative cell wall
Component of the outer members that is composed of lipids and carbohydrates
Lipopolysaccharide (LPS)
Released when gram negative bacteria die; causes fever, shock, blood clotting, and dilation of blood vessels
Lipid A (Endotoxin)
Polysaccharide that has a structural function
Core polysaccharide
Polysaccharide that functions as an antigen
O polysaccharide
Space between inner membrane and outer membrane
Periplasmic space
Type of cell wall that is present in Mycobacterium and Nocardia
Acid-fast cell wall
Acid-fast cell wall is present in _________ and __________
Mycobacterium, Nocardia
A hydrophobic waxy lipid that is present in acid-fast cell wall
Mycolic acid
Cell organelle found inside the cell wall and encloses the cytoplasm
Plasma membrane
Plasma membrane lacks sterols, except in __________ and __________
Mycoplasma, Ureaplasma
Structure of plasma membrane
Fluid mosaic model
The substance of the cell inside the plasma membrane
Cytoplasm
Site of protein synthesis; gives the cell a granular appearance
Ribosomes
2 subunits of a complete 70s ribosome
Large (50s), Small (30s)
Granules of inorganic phosphate (polyphosphate) that can be used in the synthesis of ATP
Metachromic granules
Granules made of glycogen and starch
Polysaccharide granules
Inclusions made of lipids
Lipid inclusions
Granules containing sulfur and S-containing compounds
Sulfur granules
Contains ribulose 1,5-biphosphate carboxylase
Carboxysomes
Are hollow cavities
Gas vacuoles
Contain ferric oxide
Magnetosomes
Has no nuclear envelope; contains a single long, continuous, and circularly double stranded DNA
Nucleoid
A single long, continuous, and circularly double-stranded DNA
Bacterial chromosome
Extrachromosomal DNA; are small and usually circular, double-stranded DNA
Plasmid
Specialized “resting” cells; are highly durable dehydrated cells and can survive extreme heat
Endospores
Endospores contain high amounts of __________ and __________
Dipicolinic acid (DPA), Calcium ions
Endospores are present in __________ and __________
Clostridium, Bacillus
Process of an endospore formation
Sporulation/Sporogenesis
Process of an endospore’s return to vegetative state
Germination
2 types of prokaryotes
Bacteria, Archaeabacteria
Unicellular prokaryotes; have peptidoglycan walls and reproduce by binary fission
Bacteria
Are prokaryotes that live in extreme environments and carry out unusual metabolic processes
Archaeabacteria
3 types of archaeabacteria
Methanogens, Extreme halophiles, Hyperthermophiles
Type of archaebacteria that are obligate anaerobes that produce CH4 from CO2 and H2
Methanogens
Type of archaebacteria that require high concentrations of salt for survival
Extreme halophiles
Type of archaeabacteria that grows in extremely hot environments
Hyperthermophiles
3 types of eukaryotes
Fungi, Protists, Animal parasites
Are eukaryotes that may be unicellular or multicellular, have chitin cell walls, and reproduce sexually or asexually
Fungi
Are eukaryotes that are not plants, fungi, or animals
Protists
2 types of protists
Protozoa, Algae
Are unicellular non photosynthetic protists; reproduce sexually or asexually
Protozoa
Are unicellular photosynthetic protists; have cellulose cell walls and produce sexually or asexually
Algae
Are multicellular eukaryotes
Animal parasites
2 types of animal parasites
Flatworms, Roundworms
Acellular obligatory intracellular parasites that multiply inside living cells by using the synthesizing machinery of the cell
Viruses
Infectious proteinaceous particle
Prions