Viruses - Resulting daughter cells have prophage in their...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Viruses Bacteriophage : Viruses that eat bacteria. Inside the bacteria the virus can reproduce in two ways. Lytic Cycle Phage injects DNA. Head and tail do not enter the bacteria. Phage DNA circularizes and takes command of host cell. Bacterial cell makes viral DNA, proteins, head and tail to make new viruses. Bacterial cell bursts (or lyses) releasing the phages. Lysogenic Cycle Phage injects DNA in the bacteria. Phage DNA circularizes and intergrates into bacterial DNA. Phage DNA is now called prophage and is inactive. As bacterial cell divides the prophage is copied along with bacterial DNA.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Resulting daughter cells have prophage in their DNA. Prophage may stay in the bacterial cells indefinitely. Or it may leave the bacterial DNA (because of change in environmental conditions) and follow the lytic cycle. HIV Retro virus Virus injects RNA in the animal cell. Enzymes remove protein coat. RNA is copied into DNA using reverse transcriptase. DNA enters nucleus and inserts into chromosomal DNA –provirus Occasionally, provirus becomes active producing viral RNA and proteins. New viruses once assembled leave the cell to infect other cells....
View Full Document

This note was uploaded on 11/17/2010 for the course BIO bio 101 taught by Professor C during the Spring '05 term at Diablo Valley College.

Ask a homework question - tutors are online