Viruses
Useful links
How you get the flu:
http://www.youtube.com/watch?v=Rpj0emEGShQ
Virus are very basic organisms
Structure
DNA is stored inside the
head capsule
No ribosomes, so cannot
reproduce by themselves
Must inhabit host in order
to reproduce
Through lytic cycle or
lysogenic cycle
Lyctic Cycle
Particle attaches to host.
Releases genetic information
Injected genetic material
recruits host enzymes
Enzymes make parts for new
virus particles
Assemble and break free
Lysogenic Cycle
DNA is integrated into the
hosts’ genome
All daughter cells will have
the virus DNA
At a later date, the daughter
cells can release the viruses
and go through the lytic cycle
Question about viruses
1. True or False: Many
common illnesses are caused by
viruses.
2. True or False: Viruses are
easily killed by drugs such as
antibiotics.
1. Vero o Falso: molte
malattie comuni sono
causate da virus.
2. Vero o Falso: I virus
sono facilmente ucciso da
farmaci come antibiotici.
Question about viruses
3. True or False: Once you
have contracted a specific
virus, you will not get sick
from this virus again because
of the antibodies produced in
your body.
4. True or False: Many
diseases caused by viruses can
be avoided through being
vaccinated against the virus.
3. Vero o Falso: Dopo
aver contratto un virus
specifico, non si
ammalano di questo virus
di nuovo a causa degli
anticorpi prodotti nel
vostro corpo.
4. Vero o Falso: Molte
malattie causate da virus
possono essere evitati
mediante l'essere
vaccinati contro il virus.
Question about viruses
5. True or False: Viruses are
very fragile and cannot live on
surfaces outside of the human
body.
6. True or False: Viruses
have the ability to change
themselves, or mutate, over
time.
5. Vero o Falso: I virus
sono molto fragili e non
può vivere sulle superfici
esterne del corpo umano.
6. Vero o Falso: I virus
hanno la capacità di
cambiare se stessi, o
mutare, nel corso del
tempo.
Question about viruses
7. True or False: Viral
illnesses cannot be transferred
from animals to people.
8. True or False: The only
way to transmit viruses is
through close physical contact
with an infected person.
7. Vero o Falso: malattie
virali non possono essere
trasferiti dagli animali alle
persone.
8. Vero o Falso: L'unico
modo per trasmettere
virus avviene attraverso
stretto contatto fisico con
una persona infetta.
Question about viruses
9. True or False: Viruses
can become resistant to drugs
used to treat them.
10. True or False: One of
the best ways to prevent the
spread of viral diseases is
frequent, thorough hand
washing.
9. Vero o Falso: virus può
diventare resistente ai
farmaci usati per curarle.
10. Vero o Falso: Uno dei
modi migliori per
prevenire la diffusione di
malattie virali è frequente,
alla igiene.