Virus to Cells

By, Anjali Philipose


A virus- are parasites to every cell,it's extremely selective to what cell it infects because the surface of the virus has to match with the surface of the cell. Viruses can infect cells,use cells to make more viruses ( reproduce ),evolves over time and can disease to animals,plants and humans.

  • Immune system

Picture of Viruses and Cells

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Virus Reproduction

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1) The Lytic Cycle

The Lytic cycle is one of the types paths of infection. This process occurs faster and has replication involved.


  1. Virus attaches and enters the host cell
  2. The host cell makes many copies of the virus's
  3. The viruses burst out of the cell,destroying it.
  4. New viruses seek out cells to infect.
  • New phages are produced cell lysis
  • Attachment-Replication-Assembly-Release
  • Ex: Influenza
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2) The Lysogenic Cycle

This is the other cycle of infection and occurs longer.


  1. Attaches and enters the cell
  2. Virus DNA incorporated into the host cell DNA
  3. Cell divides & each daughter cell viral DNA
  4. Virus becomes active and enters the Lytic cycle
  • Red Material= Prophage,viral DNA replicate along cell
  • Ex: HIV virus

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The Characteristics of Life ( Living v. Non living )

Livings things have: Virus?

- Living this contain a universal genetic materials: Viruses contain DNA & RNA ( retrovirus ) and inject it to other cells.

- Living things have cell: Viruses dont have cellular structure and attaches to cells.

- Living things obtain and use energy ( ATP ): Viruses have no metabolism

- Living things come from other organisms or species: Viruses are isolated from living things because they are non living.

- Living things live in an organized manner: Viruses

- Living things can reproduce ( sexually/asexually): Viruses reproduce,but not on their own.

- Living things grow and have movement: Viruses are very small and spread/ due to replication, increase the population through movement of other cells.

- Living things as a group evolve: Viruses evolve. ( ex: mutations )