UNIT IV:Classification Flashcards
The science of classifying organisms
Taxonomy
The science of classifying organisms ACCORDING TO THEIR NATURAL RELATIONSHIPS
Phylogeny/Systematics
He introduced the formal System of Classification with Two Kingdoms
Linnaeus
He introduced the formal System of Classification with Two Kingdoms
Linnaeus
Proposed that bacteria and fungi be placed in Plantae
Nägeli
Proposed Three Kingdom System; addition of Kingdom Protista
Haeckel
Six Kingdoms proposed by Woese and Fox
Archaebacteria, Eubacteria, Protista, Fungi, Plantae, Animalia
Common denominator of three Domains (Bacteria, Archaea, Eukaryotes)
Ribosomes and Plasma
Project aiming to identify and record every species of life on earth in the next 25 years
All Species Inventory
Domain that includes plants, animals, protists and Fungi
Eukarya/Eukaryotes
[Domain] Includes pathogenic and non-pathogenic prokaryotes; has peptidoglycan cell walls
Bacteria
[Domain] Prokaryotes that do not have peptidoglycan in their cell wall; often live in extreme environments
Archaea
Strict anaerobes that produce methane from CO2 ans Hydrogen
Methanogens
Microorganisms that require high Concentration of Salt for survival
Extreme Halophiles
Microorganisms that normally grows in extremely hot environment
Hyperthermophiles
Explain Endosymbiotic Theory
Eukaryotic cells evolved from Prokaryotic Cells living inside one another as endosymbionts
Form of Classification established by Linnaeus
Taxonomic Hierarchy/ Hierarchical system of Classification
A level of grouping in the Taxonomic Hierarchy
Taxon/ Taxa
Method in which organisms are grouped based purely on inferred evolutionary relatedness, ignoring morphological similarity
Phylogenetic Taxonomy
A population of closely related interbreeding individuals
Species
A Group of genetically related species
Genus/Genera
Genera with Similar traits
Family
Families with Common Characteristics
Order/s
Orders with similar characteristics
Classes
Related classes
Phylum/Phyla
Related Phylas
Kingdom
Highest/Most Inclusive level in the Taxonomic Hierarchy
Domain
A population of cells with similar characteristics
Prokaryotic Species
Standard reference on bacterial classification
Bergey’s Manual of Systematic Bacteriology
Grown in laboratory media
Culture
A population of cell derived from a single cell
Clone
Group of bacteria derived from a single cell; usually identified by numbers, letters, or names that follow the specific epithet
Strain
distinct variation within a species of bacteria or virus or among immune cells of different individuals.
Serotype/Serovar
A catchall kingdom for eukaryotic organisms that do not fit other kingdoms
Protists
Chemoheterotrophic organisms with cell wall made of chitin
Fungi
Kingdom of Multicellular organisms that have no cell walls; Chemoheterotrophic
Animalia
Kingdom of Multicellular organisms with cell walls made of cellulose
Plantae
A group of organisms that consists of a common ancestor and all its lineal descent
Clade/Monophyletic group
Method of classifying organisms into groups of species called clades
Cladistics
Population of viruses with similar characteristics
Viral species
Placing organisms in groups of related species
Classification
Matching characteristics of an unknown organism to lists of known organisms
Identification
Branch of microbiology dealing with human pathogens
Medical Microbiology
Not nutritive; designed to prolong viability of fastidious organisms during transport
Transport media/medium
Determines the presence of bacterial enzymes
Biochemical tests
Designed to perform several biochemical tests simultaneously
Numerical Rapid Identification
Available for some medically important bacteria through protein extraction and mass spectrometry
Automated rapid identification
Science that study blood serum and immune responses that are evident in serum
Serology
Strains with different antigens are called
Serotypes/Serovars/biovars
Can differentiate not only among microbial species, but also among strains within species
Serological testing
Solutions of antibodies used in identification of microorganisms
Antiserum/antisera
Procedure where samples of unknown bacterium are added with different known antiserum to determine their agglutination response
Slide agglutination test
Used to detect the presence of antibodies; where antibodies are placed in the wells of microplate and reacts with bacteria
Enzyme-linked Immunoabsorbent Assay (ELISA)
Used to identify antibodies in a patient’s serum; proteins are seperated by electrophoresis
Western blotting
Identification of bacterial species and strains by determining their susceptibility to various phages
Phage Typing
Are bacterial viruses that usually cause lysis of the bacterial cells they infect
Bacteriophages
Used to identify bacteria in a sample without cukturing. Measures physical and chemical characteristics of cells
Flow cytometry
FAME widely used in clinical and public health laboratories
Fatty Acid methyl ester
Systems designed to separate and compare fatty acids with known fatty acid profiles of other organisms
Fatty Acid Profiles
Technique used to make millions of copies of a particular section of DNA
Polymerase Chain Reaction (PCR)
uses an organism’s DNA base composition to draw conclusions about relatedness. This base composition is usually expressed as the percentage of guanine plus cytosine (G + C).
DNA Sequencing
produced by restriction enzymes are used to determine genetic similarities.
DNA Fingerprints
The sequence of bases in ribosomal RNA can be used in the classification of organisms.
Ribotyping / rRNA sequencing
three types of rRNA molecule
23S, 16S, 5S
____ rRNA gene sequencing has become prevalent inmedical microbiologyas a rapid and cheap alternative tophenotypicmethods of bacterial identification
16S
separated DNA strands from two different organisms, it is possible to determine the extent of similarity between the base sequences of the two organisms
Nucleic Acid Hybridization
Used to detect specific DNA; uses a DNA probe to identify bacteria
Southern Blotting
can quickly detect a pathogen in a host or the environment by identifying a gene that is unique to that pathogen; composed of DNA probes
DNA Chip or Microarray
used to determine the identity, abundance, and relative activity of microorganisms in an environment and can be used to detect bacteria that have not yet been cultured. Uses a technique called fluorescent in situ hybridization
Fluorescent In Situ Hybridization (FISH)
used to amplify a small amount of microbial DNA in a sample
Nucleic Acid Amplification Tests (NAATs)
a variation of thepolymerase chain reactionthat typically measures RNA expression levels. Complementary DNA (cDNA) is made byreversetranscribing of the RNA templates with the enzymereversetranscriptase.
Reverse Transcriptase PCR/ RT-PCR
couples amplification of a target DNA sequence with quantification of the concentration of that DNA species in the reaction.
qPCR/real-time PCR
Identification based on successive questions, and each question has two possible answers.
Dichotomous Key
is a depiction of patterns of shared characteristics among taxa
Cladogram
Is a grouping that consists of an ancestral species and some, but not all of the descendants
Paraphyletic clade
Includes numerous types of organisms that lack a common ancestor
polyphyletic grouping