Download Viruses

Viruses
I.
What is a Virus?
A. Obligatory Intracellular Parasite:
B. Not considered a living organism
C. No enzymes (if any) for metabolism
D. Host range:
1. animal
2. plants
3. protists
4. fungi
5. bacteria
http://images.google.com/images?svnum=10&hl=en&safe=vss&q=tobacco
II. Virus Size
A. _____________________nm in length
E. RBC = 10,000 nm
F. E. coli = length 1000 nm
G. Rabies virus = 200 nm
H. Ebola virus = 1000 nm
I. Polio virus = 30 nm
http://www2.bc.cc.ca.us/bio16/images/13-04_VirusSizes
http://diverge.hunter.cuny.edu/~weigang/Images/13-01_virussizes_1.jpg
III. Structure (handout)
A. ________________: complete, fully developed infectious viral particle
1. ________________________
2. ________________________
3. classified by structural differences in the protein coat
B. Nucleic Acid
1. ___________________________ (not both)
2. single or double stranded
3. ________________________________(influenza)
http://fig.cox.miami.edu/~cmallery/150/proceuc/c18x2viral-
C.
:
1. ________________________
2. determined by nucleic acid
3. most mass of the virus
4. __________________________:
a) protein subunits making up the capsid
b) arrangement varies for particular type of virus
c) one or several types of proteins
http://www.hcs.ohio-state.edu/hcs300/
D.
1. some viruses have this around the coat
2. lipids, proteins, & carbs
:
3. some animal viruses use part of the host’s _______________________ as envelope
http://www.vivien-frei-herrmann.de/Schule/
E. _______________
_:
1. projections on some envelopes
2. ______________________________________________
3. mutations in virus may change surface proteins  _______________________
4. changes may affect ________________________ of host
F. Morphology
1. ______________________________
a) long rod shaped
b) ___________________________
c) ex: rabies, Ebola
2. _____________________________
a) many plant, animal, bacterial
b) many sided
c) polio, rhinoviruses (cold)
3.
:
a) usually spherical
b) herpes simplex, influenza
4. Complex Virus
Additional structures
b) Head, sheath, tail
c) Bacteriophage (__________________)
a)
http://pathmicro.med.sc.edu/mayer/phage-1.jpg
http://fig.cox.miami.edu/~cmallery/150/proceuc/c18x2viral-