Microbial Taxonomy and Systematics Flashcards
involves not just naming organisms but grouping them with other organisms that share common properties
Taxonomy
is involved in the classification and naming of organisms
taxonomy
is involved in the determination of evolutionary relationships of organisms.
systematics
ascertain the sharing of the common ancestry by different organisms
systematics
different organisms are scientifically named and grouped in different taxonomic levels
taxonomy or systematics?
taxonomy
organisms are grouped based on their evolutionary relationships.
systematics or taxonomy
systematics
can be considered as a branch of systematics
taxonomy
assigns every organism a kingdom, phylum, class, order, family, genus, and species, which, among other possibilities,
Linnean system of classification
mnemonic of Linnean system of classification
Kingdom
Phylum
Class
Order
Family
Genus
Species
. It was in 1735 when the two-kingdom system, Plantae and Animalia was formally introduced by Swedish botanist
Carolus Linnaeus
proposed to include bacteria and fungi in the plant kingdom
Carl von Nägeli
proposed the Kingdom Protista, to include bacteria, protozoa, algae, and fungi.
Ernst Haeckel
. The term prokaryote was then introduced in 1937 by
Edouard Chatton
what term is introduced to distinguish cells having no nucleus from the nucleated cells of plants and animals
prokaryote
cells in which the nuclear material (nucleoplasm) is not surrounded by a nuclear membrane
who defined prokarytoes this way
Roger Stanier
proposed the Kingdom Prokaryotae
Robert G.E. Murray
founded the five-kingdom system in which prokaryotes were placed in the Kingdom Prokaryotae, or Monera, and eukaryotes comprised the other four kingdoms.
Robert H. Whittaker
names only clades — groups of organisms that descended from a common ancestor.
phylogenetic classification system
DNA sequence-based phylogenetic analysis has revealed that the five kingdoms do not represent five primary evolutionary lines. Instead, cellular life on Earth has evolved along three primary lineages called
domains
contains the eukaryotes including the plants, animals, fungi, and protists.
what domain
Eukarya
Molecular studies in the 1970s revealed that the Archaea differed from all other bacteria in their what sequence and what structures
16s rRNA sequence
cell wall
membrane lipids
aspects of protein snythesis
are excellent tools for discerning evolutionary relationships because all cells contain ribosomes
rRNA (ribosomal RNAs)
an American microbiologist, pioneered the use of comparative rRNA sequence analysis as a measure of microbial phylogeny and, in so doing, revolutionized our understanding of cellular evolution.
Carl Woese
the greater the sequence variation between any two organisms, the greater/lesser their evolutionary divergence.
greater
The phylogenetic tree of life reveals two very important evolutionary facts:
(1) all prokaryotes are not phylogenetically closely related
(2) Archaea are actually more closely related to Eukarya than to Bacteria
The universal tree of life shows that LUCA resides very early within the ___ domain
Bacteria
largest group of bacteria
Proteobacteria
the most phylogenetically ancient phylum contains the genus
Aquifex
which are hyperthermophilic H2 (Hydrogen) – oxidizing chemolitotrop
Aquifex
green non-sulfur bacteria
Chloroflexus
follows Aquifex as the most phylogenetically acient phylum (3)
Thermodesulfobacterium
Thermotoga
Chloroflexus
the phototrophic green sulfur bacteria
Spirochetes
chemoorganotrophic bacteria (2)
Flavobacterium
Cytophaga
budding bacteria
Plantomyces
Verrucomicrobium group
Chlamydia
gram positive bacteria (2)
actinobacteria
firmicutes
mollicutes
along with his colleagues, constructed the phylogenetic trees for the prokaryotes, which showed evolutionary relatedness
Carl Woese
which differ from bacteria by its cell wall and plasma membrane chemistry, as well as the sequences of its 16S rRNA
Archaea
does Archaea and Bacteria have the same genetic material?
Yes
which domains have histones
Archaea
Eukarya
gene strucuture for three domains of life
introns absent/present
A = absent
B = absent
E = present
plasmids for three domains of life
common/rare
A = common
B = common
E = rare
polycistronic mRNA presence in three domains of life
present/absent
A = present
B = present
E = absent
ribosomes in three domains of life
70s/80s
A = 70s
B = 70s
E = 80s
which three domains of life are sensitive to streptomycin, chloramphenicol
Bacteria
initiator tRNA for each domain of life
A = Methionine
B = N-formyl methionine
C = Methionine
membrane fatty acids in three domains of life
ether linked, branched/ ester-linked, straight
A = ether-linked, branched
B = ester-linked, straight
E = ester-linked, straight
internal organelles presence in three domains of life
A = absent
B = absent
E = present
site of energy generation in three domains of life
A = cytoplasmic membrane
B = cytoplasmic membrane
E = mitochondira
presence of muramic in the cell wall in three domains of life
A = muramic acid absent
B = muramic acid present
E = muramic acid absent
have flattened square or triangular cells in domain Archaea
Haloarcula
which is composed of different substituted L-amino acids and polysaccharides
pseudomurein
have cell walls composed of a layer of proteinaceous subunits known as an ___, which is directly associated with the cell membrane
S-layer
This difference actually makes the Archaean members not susceptible to antibiotics such as penicillin and lysozyme, whose antibacterial action is specifically directed to peptidoglycan.
S-layer in Archaea
membranes, in which the lipid component of the part contains branched isoprenes instead of fatty acids
what domains
Archaea
found in extreme environments
Archaea
can live well at over 100 C what kind of Archaea
thermophilic
forms of Archaea can thrive in very cold environments, like in the Antarctic
psychropilic
The reason that this lay undetected for so long is that these organisms cannot as yet be cultured in the laboratory, and their presence can only be inferred by the use of modern DNA-based analysis
Archaea
The oldest known fossils are the remains of ____ that lived more than 3.5 billion years ago.
prokarytoes
cells evolved more recently, about 2.5 billion years ago
Eukaryotic cells
according to this theory, eukaryotic cells evolved from prokaryotic cells living inside one another, as endosymbionts
endosymbiotic theory
The original nucleoplasmic cell was prokaryotic. However, infoldings in its plasma membrane may have surrounded the nuclear region to produce a true
nucleus
endosymbiotic prokaryotes give rise to what organelles
mitochondria
chloroplast
organism in which the eukaryotic host and bacterium require each other for survival
Cyanophora paradoxa
Phylogenetic trees of species in the domain Eukarya have been constructed from comparative sequence analysis of what rRNA gene
18s
appears to give a skewed view of eukaryotic microbial evolution, it still clearly sorts the eukaryotes out as a distinct domain of life with evolutionary roots more closely tied to the Archaea than to the Bacteria.
18s rRNA sequencing
is the actual naming of organisms and follows the binomial system of nomenclature
Nomenclature