What is a Virus?
What is a virus?
A small, nonliving particle that invades and reproduces inside a living cell.
What are the two basic parts of every virus?
A protein coat and genetic material.
What is the first step when an active virus infects a cell?
It attaches to the cell.
Does a hidden virus become active right away?
No.
What virus caused the striped pattern on the Rembrandt tulip?
Tulip mosaic virus.
Are viruses living or nonliving?
Nonliving.
What is the outer layer of a virus called?
The protein coat.
It attaches to the cell.
Genetic material.
What happens to the genetic material of a hidden virus after entering a cell?
It becomes part of the cell's genetic material.
What virus can reduce rice crop yields?
Rice dwarf virus.
What must a virus enter in order to reproduce?
A living cell (host cell).
What is found inside the virus?
Genetic material.
What happens after the virus takes over the cell?
The cell makes viral proteins and genetic material.
A hidden virus may remain inactive for how long?
Months or years.
What disease can rabies viruses cause in animals and humans?
What is the organism a virus lives in called?
A host.
What does the genetic material contain?
Instructions for making new viruses.
What do the proteins and genetic material form?
New viruses.
What is one example of a hidden virus mentioned in the text?
What is a bacteriophage?
A virus that infects bacteria.
What type of relationship do viruses have with their hosts because they harm them?
Parasitic
What determines which cells a virus can infect?
The shape of the proteins in its coat.
What eventually happens to the infected cell?
It bursts open and releases new viruses.
Name one factor that can activate the cold sore virus.
Strong sunlight or stress.
What medical technique uses viruses to deliver helpful genes to cells?
Gene therapy.