Chapter 9 Section 1: Viruses
What kind of virus immediately begins to multiply after entering the cells?
Active virus
What is the structure of a virus?
All viruses have two basic parts: a protein coat that protects the virus and an inner core made of genetic material.
True or false: All viruses have the same shape.
False
True or false: Viruses are all round in shape.
False
True of false: Viruses can cause disease only in humans.
Flase
What kind of virus has its genetic material becomes part of the cell's genetic material?
Hidden virus
What kind of virus stays inactive for a long time?
Hidden virus
How do viruses multiply?
Once inside a cell, a virus's genetic material takes over many of the cell's functions. Its instructs the cell to produce the virus's proteins and genetic material. These proteins and genetic material then assemble into new viruses.
How can you treat a viral disease?
Resting, drinking plenty of fluids, and eating well-balanced meals may be all you can do while recover from a viral disease.
What happens when a cell is full of new viruses?
The bacterium burst open, releasing new viruses.
How are viruses like organisms?
The only way in which viruses are like organisms is that they can multiply.
True of false: The shape of the proteins allows the virus's coat to attach to only certain cells in the host.
True
True or false: Each virus can enter only a few types of cell in a few specific species.
True
True or false: Some viruses are surrounded by an outer membrane envelope.
True
True or false: Viruses are larger than cells.
True
True or false: Viruses are much smaller than bacteria.
True
True or false: Viruses contain genetic material.
True
True or false: Viruses need to be inside a living cell in order to reproduce.
True
True or false: When the virus is active, the cell makes the virus's proteins and genetic material and new viruses are made.
True
What do viruses act like?
Viruses act like parasites because they destroy the cells in which they multiply.
Vaccine
a substance used in a vaccination that consists of weakened or killed pathogens that can trigger the immune system into action
Virus
a tiny, nonliving particle that invades and then reproduces inside a living cell
Bacteriophage
a virus that infects bacteria
Host
the organism that a parasite or virus lives in or on
Parasite
the organism that benefits by living on or in a host in a parasitism interaction