ViralGenetics - Viral Genetics The PCAT often asks about...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Viral Genetics The PCAT often asks about viruses and how they infect cells, such as bacteria. Let’s cover some key aspects of those creatures: Viruses cannot replicate on their own; they need a host cell. There are 3 basic types of viruses. DNA-Containing Viruses : These types of viruses inject their genetic material into a cell, which can go directly into the host cell’s nucleus. Once there it hijacks replication and transcription machinery to make its own mRNA. The mRNA leaves the nucleus and begins the process of translation, ultimately making proteins necessary for new viruses. Some of these virus types carry out replication in the cytoplasm instead and must bring their own machinery. RNA-Containing Viruses : Since host cells do not replicate RNA, these types of viruses must bring RNA Replicase . There is another class of RNA-containing viruses known as retroviruses . Retroviruses create DNA from their RNA with an enzyme called reverse transcriptase . This enzyme opposes normal transcription and afterwards the viral DNA is incorporated into the host’s genome. Retrovirus’ genetic material is then processed just as the host’s is, and the only way to stop the viral infection is through eliminating the cell (example: HIV). Bacteriophages
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/21/2011 for the course BIOLOGY PCAT taught by Professor Mcfadden during the Spring '11 term at Kaplan University.

Page1 / 3

ViralGenetics - Viral Genetics The PCAT often asks about...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online