Viruses Flashcards
Many viruses cause what?
Diseases
Name some viruses
Common cold, flu, and acquired immune deficiency syndrome (AIDS)
Are viruses big or small?
Small
Are they bigger or smaller than bacteria?
Smaller
How many virus particles can fit in a drop of blood?
5 billion
Do viruses change?
Yes
If viruses change than does their affect on living things change?
Yes
Do viruses change often
Yes very often
Like living things, viruses contain (blank) and (blank)
Like living things, viruses contain protein and genetic material
Can viruses eat, grow, break down food, and use oxygen?
No
Can a virus function on its own?
No
Where is the only place a virus can reproduce?
A host
Host
An organism from which a parasite takes food or shelter
How does the virus reproduce using the host?
The virus forces the body to make more viruses
What are the basic shapes of viruses?
Crystals, spheres, cylinders, and spacecraft
How are viruses grouped?
By their shape, the disease they cause, their life cycle, or the genetic material they contain
Every virus is made up of (blank) inside a (blank)
Every virus is made up of genetic material inside a protein coat
The protein coat protects the (blank)
The protein coat protects the genetic material
The protein coat helps the virus enter a what?
A host cell
Many viruses have a protein coat that matches (blank) to their specific host
Characteristics
The genetic material in viruses is either (blank) or (blank)
DNA or RNA
Most RNA is made up of (blank) strand of nucleotides
One
Most DNA is made up of (blank) strand of nucleotides
Two
RNA and DNA both contain info for making (blank)
Proteins
The viruses that cause warts and chicken pox contain (blank)
DNA
Viruses that cause colds and the flu contain (blank)
RNA
The virus that causes AIDS which is called HIV also contains (blank)
RNA
Name step 1 in the lytic cycle
The virus finds and joins itself to a host cell
Name step 2 in the lytic cycle
The virus enters the cell or the virus’s genetic material is injected into the cell
Name step 3 in the lytic cycle
Once the virus’s genes are inside, they take over the direction of the host cell and turn it into a virus factory
Name step 4 in the lytic cycle
The viruses break out of the host cell, which kills the host cell. The cycle begins again
Do all viruses go straight into the lytic cycle?
No
Do the viruses that don’t go straight into the lytic cycle take shorter or longer time than the ones that do?
Longer
Do antibiotics kill viruses?
No they just prevent them
Virus
A microscopic particle that gets inside a cell and often destroys the cell
