|
Virus |
nonliving and are made of particles that are nucleic acid, proteins and sometimes lipids |
|
What do all viruses have in common? |
nonliving, infect host cells to make copies of itself and can infect in two different ways such as lytic or lysogenic. |
|
Most viruses are so small that they can be seen only with the aid of a powerful electron microscope. |
True |
|
Structure of a typical virus |
DNA or RNA inside the core which is surrounded by a protein coat, or capsid |
|
Capsid |
Virus’s protein coat |
|
How does a virus get inside a cell |
It would use its capsids to bind to the receptors to the host allowing the virus to come in |
|
What occurs when viruses get in cells? |
Virus genes are expressed. The host cell then transcribes or translates the viral genetic information into viral capsid proteins. Sometimes the genetic information causes the host cell to make copies of the virus, after this the host cell is destroyed. |
|
Why are viruses highly specific to the cells they infect? |
Specific viruses have to bind precisely to proteins on the cells surface. |
|
Bacteriophages |
Viruses that infect bacteria |
|
Why is lytic infection given that name? |
Host cell is lysed and destroyed |
|
lysogenic infection |
Virus embeds it DNA into the host’s DNA, The virus’s DNA is replicated along with the host cell’s DNA, a host cell makes copies of the virus indefinitely |
|
Bacteriophage attaches to the bacterium’s? |
cell wall |
|
Bacteriophage injects its _____ into the cell |
DNA |
|
Cell makes mRNA from the bacteriophage’s? |
genes |
|
Virus wrecks the cell, causing it to? |
burst |
|
The bursting of the cell releases new bactriophage ____? |
particles |
|
Retroviruses |
Are viruses that produces DNA copy of their RNA |
|
What happens when retroviruses infect a cell? |
They produce a DNA copy of their RNA, this DNA is inserted into the DNA of the host cell. The retrovirus can stay dormant for long periods of time before becoming active. |
Share This
Flashcard
