Viral Life Cycle & Reproduction

by Sruthi Boppuri

TEK 4C: Explain the viral life cycle and reproduction

The Lytic Cycle

A virus cannot reproduce on its own, so it must invade a cell in order to reproduce. During the lytic cycle, the virus injects either its DNA or RNA into the host cell and takes over the host cell. By doing this, the virus us able to make new viruses. The lytic cycle destroys the host cell.

Steps of the Lytic Cycle

1) The virus attaches itself to the host cell

2) Entry Phase: The virus injects its genetic material into the cell

3) Replication Stage: The viral parts are replicated

4) Assembly Stage: The new viruses are being assembled

5) Cellular Lysis (Release Stage): The new viruses are released after the host cell is popped open.

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The Lysogenic Cycle

During the lysogenic cycle, the host cell is not destroyed immediately. When the virus injects its genetic material into the host cell, the viral DNA or RNA becomes a part of the host DNA and becomes dormant. The cell will reproduce and replicate normally until the viral DNA becomes active. The viral DNA will cut itself out of the host DNA and take over the host cell. Then, it goes through the lytic cycle.

Steps of the Lysogenic Cycle

1) The virus attaches itself to the host cell

2) The virus inserts its genetic material into the cell

3) The DNA of the virus integrates into the host's DNA

4) The host cell replicated normally with the viral DNA altering protein synthesis

5) Then, the new cells go through the lytic cycle.

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Bibliography

-The videos that were assigned to us

Lysogenic Cycle. Digital image. Prism.gatech.edu. N.p., n.d. Web. 16 Mar. 2015. <http://www.prism.gatech.edu/~gh19/b1510/8lytic.jpg>.

Lytic Cycle. Digital image. Nicerweb.com. N.p., n.d. Web. 16 Mar. 2015. <http://bio1151.nicerweb.com/Locked/media/ch19/19_05T4LyticCycle_5-L.jpg>.

"2 Life Cycles of a Virus." Two Life Cycles of a Virus. N.p., n.d. Web. 15 Mar. 2015. <http://biology.kenyon.edu/HHMI/Biol113/2virus.htm>.