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34 Cards in this Set
- Front
- Back
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what are the six general groups of disease causing organisms
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virus
bacti fungi protozoa helminths prions |
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_____ are infectious proteins with NO nucleic acid
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prions
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T or F prokaryotes have no distinct nucleus
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true this is the most striking feature of prokaryotes!
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what two major pathogen classes have external walls
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bacti- peptidoglyca
fungi- rigid chitin |
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T or F. bacti, fungi, protozoa, helminths all have DNA AND RNA
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true
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___ are classified based on type of nucleic acid present, the number of nucleic acid strands, the presence or absence of a lipid envelope and the symmetry of the virus particle
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viruses
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____ are single cell euk
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protozoa
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african sleeping sickness
malaria amoebic dysentery are all types of ____ |
protozoa
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what are four divisions of protozoans
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flagellates
amoebae ciliates sporozoa |
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name you three categories of aerobic GPC
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staph
strep enterococcus |
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what is the only naaerobic GPC you know
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peptostreptococcus
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name two aerobic GPR
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bacillus
listeria |
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what is the clostridia family -- positive/neg rods/cocci ana/aerobic
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anaerobic GPR
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Pseudomonas aeruginosa, H flue, ecoli kelsiella are all
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aerobic GNR
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what is the only anaerobic GNR you need to know
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bacteroides fragilis
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there are no common medically sinificant anaerobic ___
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GNC
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name the three aerobic GNC you shoudl know
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neisseria (meningitidis, gonorrhoeae)
moraxells catarrhalis |
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T or F bacti are multiplying in the lag phase
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false but they are MATURING
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T or F bacti are multiplying in the stationary phase
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true
the rate of birth is equal to rate of death |
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give the temps of bactiphiles
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psychrophiles <20C
mesophiles 20-45C thermophiles >45 C |
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_______ is a strict aerobe
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myco tB
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what are two causes of meningitis that also are capnophiles
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neisseria meningitidis
H flu |
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the majority of mdically significant bacteria are ______ anaerobes!
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facultative
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extra chromosomal circular pieces of DNA are called ____
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plasmids
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_____ are mobile pieces of DNA that can excise adn transfer themselves from one chromosome to another without having NDA homology
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transposons
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what are three mechanisms of genetic transfer
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transformation
transduction conjugation |
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____ is when free DNA is taken up into a related specifes cell wall
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transformation
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name a few clinically significant bacti that can carry out transformation
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strep pneumo
h flu n meningitidis |
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_____ ____ occurs when fragments of the degraded bacti DNA are mistakenly packaged into the assembling phage head instead of viral DNA
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generalized transduction
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____ ____ occurs when injected viral DNA incorpoates into specific insertion sites in the bacti genome
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specialized transduction
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T or F. conjugation can occur in unrelated bacti while transofmraiton and transduction tend to occur between very closely related species
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true
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F+ italks about what kind of exchange
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conjugation
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how is conjugation different from GP and GN
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in GN sex pilus
in GP adhesins |
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_____ happens by a bacteriophage
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transduction
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