Post on 16-Dec-2015
transcript
#2: Viruses cannot survive without a hostA host is where it lives (other organisms). If it is
not in a host, the virus will die.
Viral Life Cycle: LyticSummary: viral DNA mRNA Protein
Virus will use the host cell
to make proteins
needed to create more
viruses.
a. Virus approaches a specific cell to
infect
b. Virus attaches to the host cell
Host Cell
Virus
c. Virus injects its DNA into the host
cell
d. Host cells organelles start
“reading” the viral DNA. It has the
recipe to destroy the host cell DNA and how to make more viral parts
e. Viral assembly. All the created
viral parts come together to form
new viruses
f. The host cell is destroyed or “lysed”. New
viruses set out to find new cells to
repeat the process
Example: Chicken Pox
Occurs through direct contact with
someone infected with the chickenpox virus, or through the air from an infected person's coughing or
sneezing
Viral Life Cycle: Lysogenicviral DNA becomes apart of host cell DNA pops
out of host cell DNA due to stress mRNA Protein
Viral DNA becomes apart of host cell DNA; When stressed viral DNA will detach itself from host cell DNA and switch to
the Lytic cycle
a. Virus approaches a specific cell to
infect
b. Virus attaches to the host cell and
injects its DNA into the host cell
Host Cell
Virus
c. Viral DNA approaches the host cell DNA
d. Viral DNA becomes apart of the host cell DNA
e. The viral DNA and host cell DNA
is copied every time a new cell is
created.
f. Stress causes the viral DNA to pop
out of the host cell DNA. The lytic
cycle begins: more viral parts are
created, assembled, and
then the host cell is destroyed
Viral DNA
Example: Shingles
The chickenpox virus remains dormant
(not used) for years. Environmental
pressure or extreme stress can cause the virus to switch in to
the lytic cycle.
Raise your hand if you have had
chicken pox???
Raise your hand if you think you
could you get it again???
Yes….you could get SHINGLES.
Example: Herpes Simplex
Transmission: Coming into contact with someone who is infected with the virus.
This could include kissing and sex.
There is no cure.