What is a virus?
•Microscopic particles
(microbe) that invade the
cells of living organisms.
Viral Characteristics…
Viruses are not living
organisms!
Living Characteristics
Contain genetic
information –DNA or RNA
...
What does a virus look like?
• Viruses have many different shapes
and sizes, but all viruses are smaller
than bacteria cel...
Basic Structure of Virus
• Core-
nucleic acid (DNA or RNA)
• Capsid-
protein coat surrounds core
In order to exist and
reproduce,
a virus must invade
a living cell.
This living cell is referred
to as a host.
Viral Reproduction
Steps of viral reproduction:
• Recognition
• Attachment
• Injection
• Assembly
• Lysis
Lytic Viruses
• This type of virus replicates immediately and kills the
host cell.
• Virus enters host, replicates, causes...
Lysogenic Virus
Virus does NOT kill host
immediately.
Viral nucleic acid “fuses” with
the host cell nucleic acid.
Lysog...
Lysogenic Virus
PROPHAGE
(VIRAL DNA)
Viruses
Viruses
Viruses
Viruses
Viruses
Upcoming SlideShare
Loading in...5
×

Viruses

327

Published on

Published in: Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
327
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
15
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Viruses

  1. 1. What is a virus? •Microscopic particles (microbe) that invade the cells of living organisms.
  2. 2. Viral Characteristics… Viruses are not living organisms! Living Characteristics Contain genetic information –DNA or RNA Heredity- do pass genetic information to next generation Can reproduce Non-Living Characteristics Not cells- can’t make proteins. Can’t make or use energy. Can’t survive or reproduce without a host.
  3. 3. What does a virus look like? • Viruses have many different shapes and sizes, but all viruses are smaller than bacteria cells.
  4. 4. Basic Structure of Virus • Core- nucleic acid (DNA or RNA) • Capsid- protein coat surrounds core
  5. 5. In order to exist and reproduce, a virus must invade a living cell. This living cell is referred to as a host.
  6. 6. Viral Reproduction Steps of viral reproduction: • Recognition • Attachment • Injection • Assembly • Lysis
  7. 7. Lytic Viruses • This type of virus replicates immediately and kills the host cell. • Virus enters host, replicates, causes host to burst= lysis.
  8. 8. Lysogenic Virus Virus does NOT kill host immediately. Viral nucleic acid “fuses” with the host cell nucleic acid. Lysogenic viruses have a “dormant” period. Results in many cells being “infected.”
  9. 9. Lysogenic Virus PROPHAGE (VIRAL DNA)
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×