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19 Cards in this Set

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How did we PREVIOUSLY catergorize bacteria?
By how they looked and moved
What changed in the way we classify bacteria?
Genetics and technological advances
Has ALL bacteria been re-classified?
No
What is the biologists "bible"
Bergy's Manual of Systematic Bacteriology (BMSB)
What exactly is BMSB?
The accepted system of bacterial taxonomy
Is BMSB official?
No, in fact it is still considered controversial
When was the first edition of BMSB printed?
1984
What edition is BMSB currently in ?
9th edition
What was the MAJOR change in the 2nd edition of BMSB?
It went phylogenetic (evolutionary relatedness) rather than phenetic (observable and similar traits)
What are some molecular characteristics in which we use to classify?
1. Nucleic acid composition, and sequencing
2. Genomic fingerprinting
3. Amino acid sequencing
When referring to nucleic acid composition, what is most important?
The G and C content (for example, does the cell have a high OR low G and C content?)
What are the two highest ranking domains we are being tested on?
Bacteria and Archaea
Within the hightest domain, what do we need to focus on for this test?
Genus and species ONLY!
What is a genus?
Well-defined group of one or more strains
What is a species?
1. Collection of strains that share many properties and differ greatly from other strains
2. Share same sequences within their "core" genes
What are the three types of strains we should know?
1. Biovars - differ biochemically and physiologically
2. Morphovars
3. Serovars - differ in antigenic properties
What is a "type" strain?
Usually fully characterized
How can we identify a type strain?
Through bacteriophage (for example, some viruses will attack a specific strain ONLY)
What is the ATCC?
American Type Culture Collection - a non-profit center since 1914 whom keeps a library of specimens from all known types