THE PLAGUE IS SPREADING!

WHAT IS THE LYTIC CYCLE?

• A virus enters a host cell.
• The virus injects its DNA into the cell.
• The cell replicates the viral DNA.
• The copies grow into new viruses.
• The viruses burst out of the cell, killing it.

WHY CAN'T PLANTS CATCH A COLD?

• Certain viruses can only affect certain organisms.
• One of these viruses is the cold.
• Most viruses that affect humans don't affect other organisms, and vice versa.
• An example is the tobacco mosaic virus.
• This virus can only affect tomato plants.

HOW ARE VIRUSES STOPPED?

• Viruses are stopped using a lengthy process.
• The process is called vaccination.
• There are certain vaccines for each virus.
• You've probably had a flu shot before.
• That's an example of a vaccine.

POP QUIZ!

• How do viruses replicate?
• Are viruses living?
• What is the lytic cycle?
• What is a host cell?
• Why can't plants catch a cold?

BEN BANKS

ANSWER KEY

• 1. A virus injects it's DNA into a host cell. The viral DNA then bursts out, killing it.
• No.
• The process in which viruses replicate.
• A host cell is the cell that the viral DNA is injected into.
• Because certain viruses can only infect certain organisms.