1 / 11

Viruses

Viruses. Viruses. Virus: A nonliving strand of genetic material within a protein coat. Why are they considered not alive??? Cannot make proteins CANNOT REPLICATE ON THEIR OWN. Virus Structure. Capsid: All viruses have an outer layer made up of proteins.

eden
Download Presentation

Viruses

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Viruses

  2. Viruses Virus: A nonliving strand of genetic material within a protein coat. Why are they considered not alive??? Cannot make proteins CANNOT REPLICATE ON THEIR OWN.

  3. Virus Structure Capsid: All viruses have an outer layer made up of proteins. Genetic Material: Either DNA or RNA, depending on which virus.

  4. Human Viral Diseases Aids Measles Mumps Chicken Pox Common cold Influenza Polio Hepatitis

  5. Different Kinds of Virus Three main types: 1. Bacteriophage: Viruses that infect bacteria. 2. Retroviruses: Have RNA instead of DNA for genetic material. 3. DNA Viruses: Have DNA as genetic material.

  6. Virus Infection (REPLICATION) In order to replicate, A virus MUST HAVE A HOST. 2 main ways of replicationd: LYTIC and LYSOGENIC. LYTIC: immediate invasion and replication LYSOGENIC: Becomes part of host’s genetic material and has delayed virus replication.

  7. Viral Infection: LYTIC CYCLE Replication LYTIC CYCLE: 1. Virus attaches to host cell. 2. Virus injects its genetic material into the host. 3. The virus now takes over the host cell. 4. The host cell makes more virus protein and genetic material. (instead of its normal genetic material). 5. The newly built viruses burst out of the cell (killing it) and infect other host cells.

  8. LYTIC

  9. Viral Infection: LYSOGENIC CYCLE Replication LYSOGENIC CYCLE 1. Virus attaches to host cell. 2. Virus injects its genetic material into the host. 3. The virus does not take over the cell, but instead inserts its genetic material into the host cells genome. 4. The host cell replicates and each new cell contains the viral genetic material in its genome. 5. A trigger causes the Lytic cycle to begin and the virus DNA construct viruses and they burst out of the cell.

  10. LYSOGENIC

  11. Prevention and Treatment Vaccines: when we give someone a little bit of a dead or damaged virus so our body can recognize it and then build up protection against it in the future if we come into contact with an active strain. Vaccines are provided for measles, mumps, rubella, hepatitis, chicken pox, and polio. Why cant we create a vaccine for HIV? We can also provide antiviral drugs once some one has contracted the diseases to interrupt and slow it down.

More Related