viruses and bacteria
Download
Skip this Video
Download Presentation
Viruses and Bacteria

Loading in 2 Seconds...

play fullscreen
1 / 10

Viruses and Bacteria - PowerPoint PPT Presentation


  • 78 Views
  • Uploaded on

Viruses and Bacteria. Viruses. A virus is a piece of hereditary material (RNA or DNA) that is covered by protein that infects and reproduces in living cells . Viruses are not considered living things because they are unable to reproduce on their own: they require a host cell .

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Viruses and Bacteria' - azuka


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
viruses
Viruses
  • A virus is a piece of hereditary material (RNA or DNA) that is covered by protein that infects and reproduces in living cells.
  • Viruses are not considered living things because they are unable to reproduce on their own: they require a host cell.
  • Viruses are extremely small, much smaller than bacteria cells.
  • Active Viruses: The virus enters a host cell and become active right away by causing the cell to make new virus particles.
label
LABEL

ACTIVE VIRUSES:

A: Viruses attach to cell.

B: DNA/RNA injected into cell

C: Virus takes control of cell & makes new virus particles.

D: Cell bursts open releasing 100’s of viruses to infect more cells.

slide4
Latent Viruses: The virus enters the host cell and becomes a part of the cell’s DNA without destroying the cell or making new virus particles. The virus can hide for years before it becomes active.
  • Viral Diseases: Viruses can cause STDs. There are no antibiotic medications to cure viral diseases. Viral diseases can be prevented by vaccines.
  • Parts of a virus are: DNA/RNA & protein
label1
LABEL

LATENT VIRUSES

A: Attach

B: Virus becomes part of cell’s DNA.

C: Cell divides.

D: Virus becomes active.

E: New viruses are made.

F: Cell breaks open releasing new viruses.

bacteria
BACTERIA
  • All bacteria belong to the Kingdom monera.
  • Bacteria are one-celled organisms that do not have a nucleus.
  • Bacteria reproduce by a process called fission - when a parent cell splits to produce two new cells that are exactly alike.
  • Some bacteria can also reproduce sexually by lining up beside each other and exchanging DNA. This process produces a cell that is different than the parent cells.
slide7
Bacteria are everywhere- in the food you eat, in the air you breathe, and millions live in your body.
  • Most bacteria are beneficial to us: however, some can cause disease.
  • Many bacteria can cause STDs.
  • An organism, such as bacteria, that can cause disease is called a pathogen.
slide8
Diseases caused by bacteria are usually treated with antibiotics.
  • An antibiotic is a substance produced by one organism that inhibits or kills another organism.
  • For example, penicillin prevents bacteria cells from forming cell walls so they cannot survive.
  • Some diseases can be prevented by vaccines.
slide9
A vaccine is made from damaged or killed bacteria.
  • Vaccines are injected into the body so that the white blood cells can recognize the bacteria.
  • If they ever come in contact with the bacteria again, they can immediately attack and kill them.
  • Parts of a Bacteria: cytoplasm, cell membrane, cell wall & Flagella, capsule, DNA
ad