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1st Period
By: Camilo Andrés Garzón 8B
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INFORMATION
CLICK ON THE
IMAGES ALONG
THE NOTEBOOK
TOPICS
 VIRUS – Definition
 Characteristics of Virus V.S. Characteristics of Living
Things
 Types of Replication
 Types of Viruses
 Infectious Agents
 Vaccines
 Mentefacto
VIRUS - Definition
 A Virus is an ultramicroscopic particle (from 20-300
nm in diameter) metabolically inert, that is an
infectious agent that replicates only within the cell of a
living host, composed of an RNA or DNA core, a
protein coat (capsid) and sometimes a surrounding
envelope.
Characteristics of Viruses V.S.
Characteristics of Living Things
Living Things
Viruses
 They Grow
 They don’t grow
 They Reproduce
 They don’t reproduce
 They are made up of Cells
 They aren’t made up of cells
 They Need and Use Energy
 They don’t need or use energy
 They Develop
 They don’t develop
 They are Organized
 They aren’t organized
 They have a Life Span
 They don’t have a life span
 They Adapt
 They Adapt
Types of Replication
Lytic Cycle
1.
2.
3.
4.
5.
6.
Penetration
Replication of G.M.
Transcription
Protein Synthesis
Viral Assembly
Releasing
Lisogenic Cycle
1.
2.
3.
4.
5.
6.
Penetration
G.M. is mixed with G.M. of
the cell
Cellular Division
DNA Activation
Replication of G.M.
Transcription
Types of Viruses
 Viruses with DNA Viruses with
(single or double
stranded)
 Viruses with a
surrounding
envelope +
protein + genetic
material
RNA (single or
double
stranded)
Viruses of
protein +
genetic material
•Icosahedron viruses
•Enveloped viruses
•Helical viruses
•Complex viruses
Infectious Agents
Viroids
 Are made only of Genetic
Material (DNA or RNA,
Single or Double Stranded)
 Only attacks Plants
Prions
 Are made only of Protein
(they are neurotransmitters
that were folded in a wrong
way)
 Only attacks Animals’
nervous system
Vaccines
 Vaccines are viruses that are modified viruses that
affect other viruses. They are only made of the protein
coat (capsid) of the virus. It “tells” the genetic
sequence of the virus, to the cells of the organism that
is infected.
 Antibiotics cannot destroy viruses, because viruses are
metabolically inert, they aren’t alive.
 They were discovered by Edward Jenner in order to
fight against smallpox.
Vaccinia
(Smallpox)
Vaccine
Ultramicroscopic Particle
According
to
structure
VIRUS
Viroid
According
to
G.M.
DNA
Prions
According
to
strands
RNA
SINGLE
DOUBLE
Characteristics
 Metabolically inert
 Only replicates within the cell of a living host
 Composed of a RNA or DNA, single or double
stranded, and a protein coat named capsid
 It only fulfills one characteristic of living things, and
that is that they adapt
 It varies from size 20-300 nm
FOR MORE INFORMATION
UNIVERSITY OF SOUTH CAROLINA – MEDICINE
http://pathmicro.med.sc.edu/book/video-mp.htm
Bibliography:
•BIOLOGY NOTEBOOK
*1ST PERIOD