Home
Flashcards
Preview
Medical microbiology
Home
Get App
Take Quiz
Create
What kind of nucleic acids do they have?
single stranded or double stranded DNA
single stranded or double stranded RNA
-single standed RNA can be either + sense (mRNA) or - sense (complimentary strand has to be made before it can be copied)
Capsid
encases the nucleic acid
composed of proteins
shape of capsid:
helical
forms spiral around Nucleic acid
-most common
shape of capsid:
polyhedral
many sided
-most common
shape of capsid:
complex
combination of helical and 20 trangle faces
Envelope
around capsid
host derived
glycoprotein spiked - attachment
phospholipid membrane w/ proteins
benefits of envelope
acquired from host so it's hidden from host defense systems
help infect new cells by fusion of the envelope with hosts cells
disadvantages of envelope
nakes viruses are more resistant to envriomental changes
destroyed easier from breakdown of proteins and they no longer would have the spikes for attachment
Definitive host:
where sexual reproduction occurs
Intermediate host:
required by the life cycle but sexual reproduction doesn't occur
resevoir host
the ones we're conserned with getting infected
host range:
most limited to single species
exception
: rabies virus
Specificity:
most limited to specific cells
exception
: cytomegaloviruses
Prions
primary structure the same as normal proteins
very difficult to destroy
protein that folds abnormally on itself which induces normal proteins to fold abnormally (by bumping into each other)
Protists
unicellular
many phylum
eukaryotic structure
Protists:
mastigophorons
have flagelum
Protists:
amebozoa
injests food by phagocytosis
Protists:
apicomplexans
tear drop shape
Protists:
cilliates
have cillia
fungi
chitin in cell walls
non-motile
extracellular digestion
classification
: based on nature of sexual state
multicellular
: mycelium composed of hyphae
single celled
: yeast
classification of viruses based on
type of NA
make-up and shape of capsid
+/- envelope
mode of replication
# of copies of NA
# of segments of 1 NA
linear or circular DNA
Author
tigray
ID
68787
Card Set
Medical microbiology
Description
everything i need to know for the second exam on viruses
Updated
2011-02-25T03:10:07Z
Show Answers
Home
Flashcards
Preview