BIO 225 (Microbiology) LEC OUTLINE
FOR MICRO LECTURE 1 EXAM FROM,
MICROBIOLOGY FUNDAMENTALS A
CLINICAL APPROACH, COWAN SMITH
WITH IMAGES GREENE VILLE
TECHNICAL COLLEGE.
,Chapter 5: Viruses and Prions
How Viruses are Classified and Named
For many years, animal viruses were classified on the basis of their hosts
and the diseases they caused.
Never classification systems emphasize the following:
• Hosts and diseases they cause
• Structure
• Chemical composition
• Similarities in genetic makeup
International Committee on the Taxonomy of Viruses is in charge of
classifying and categorizing viruses
Clinicians typically use common names
See Table 5.1 Properties of Viruses
, The General Structure of Viruses
Figure 5.1 shows size comparisons of selected viruses, bacteria and
eukaryotoes
The structure contains only those parts needed to invade and control a host
cell:
• External coating
• Core containing DNA or RNA
• Sometimes one or two enzymes
The Viral Capsid and Envelope
Capsid: The protein shell of a virus particle that surrounds its nucleic
acid
Constructed from what subunits?:
• Capsids are constructed from protein subunits called capsomeres
Arrangement of capsomeres results in 2 different types of capsid (Table 5.2,
5.3)
FOR MICRO LECTURE 1 EXAM FROM,
MICROBIOLOGY FUNDAMENTALS A
CLINICAL APPROACH, COWAN SMITH
WITH IMAGES GREENE VILLE
TECHNICAL COLLEGE.
,Chapter 5: Viruses and Prions
How Viruses are Classified and Named
For many years, animal viruses were classified on the basis of their hosts
and the diseases they caused.
Never classification systems emphasize the following:
• Hosts and diseases they cause
• Structure
• Chemical composition
• Similarities in genetic makeup
International Committee on the Taxonomy of Viruses is in charge of
classifying and categorizing viruses
Clinicians typically use common names
See Table 5.1 Properties of Viruses
, The General Structure of Viruses
Figure 5.1 shows size comparisons of selected viruses, bacteria and
eukaryotoes
The structure contains only those parts needed to invade and control a host
cell:
• External coating
• Core containing DNA or RNA
• Sometimes one or two enzymes
The Viral Capsid and Envelope
Capsid: The protein shell of a virus particle that surrounds its nucleic
acid
Constructed from what subunits?:
• Capsids are constructed from protein subunits called capsomeres
Arrangement of capsomeres results in 2 different types of capsid (Table 5.2,
5.3)
