(a) List two DNA viruses and two RNA viruses. (b) What is a Lytic cycle? (c) What must happen for a virus to attach to a cell? (d) Why wouldn\'t a virus infect just any type of cell? Solution 1. I: dsDNA viruses (e.g. Adenoviruses, Herpesviruses, Poxviruses) II: ssDNA viruses (+ strand or \"sense\") DNA (e.g. Parvoviruses) III: dsRNA viruses (e.g. Reoviruses) IV: (+)ssRNA viruses (+ strand or sense) RNA (e.g. Picornaviruses, Togaviruses) 2. A temperate bacteriophage has lytic and lysogenic cycles. In the lytic cycle, the phage replicates and lyses the host cell. In the lysogenic cycle, phage DNA is integrated into the host genome, in which it is passed on to next generations. 3. When virus attached to a cell, it delivers its DNA or RNA into the host cell. Therefore, contamination requires that the virus get through the cell membrane. Some viruses remain outside the cell. They connect to the membrane at specific receptor. Once connected the virus injects its DNA or RNA into the cell. Enveloped viruses are enclosed in a membrane just like that of the host cell. The virus and the envelope fuse and the virus enters the cell through endocytosis. In the first example simple genetic material enters the cell. In the second case the entire virus from the envelope enters the cell. 4. All viruses have a form of protein at the outer coat or envelope that \"feels\" or \"acknowledges\" the right host cell.This protein attaches the virus to the membrane of the host cell.Some enveloped viruses can dissolve proper through the cell membrane of the host because each the virus envelope and the cell membrane are product of lipids. Those viruses that don\'t enter the cell have to inject their contents (genetic commands, enzymes) into the host cell. Those viruses that dissolve into a cellular certainly release their contents as soon as in the host. In either case, the consequences are the identical.So virus would not infect each cell. Hope everything is clear and you like the answer..

1. (a) List two DNA viruses and two RNA viruses. (b) What is a Lytic cycle? (c) What must
happen for a virus to attach to a cell? (d) Why wouldn't a virus infect just any type of cell?
Solution
1. I: dsDNA viruses (e.g. Adenoviruses, Herpesviruses, Poxviruses)
II: ssDNA viruses (+ strand or "sense") DNA (e.g. Parvoviruses)
III: dsRNA viruses (e.g. Reoviruses)
IV: (+)ssRNA viruses (+ strand or sense) RNA (e.g. Picornaviruses, Togaviruses)
2.
A temperate bacteriophage has lytic and lysogenic cycles. In the lytic cycle, the phage replicates
and lyses the host cell. In the lysogenic cycle, phage DNA is integrated into the host genome, in
which it is passed on to next generations.
3.
When virus attached to a cell, it delivers its DNA or RNA into the host cell. Therefore,
contamination requires that the virus get through the cell membrane. Some viruses remain
outside the cell. They connect to the membrane at specific receptor. Once connected the virus
injects its DNA or RNA into the cell. Enveloped viruses are enclosed in a membrane just like
that of the host cell. The virus and the envelope fuse and the virus enters the cell through
endocytosis. In the first example simple genetic material enters the cell. In the second case the
entire virus from the envelope enters the cell.
4.
All viruses have a form of protein at the outer coat or envelope that "feels" or
"acknowledges" the right host cell.This protein attaches the virus to the membrane of the host
cell.Some enveloped viruses can dissolve proper through the cell membrane of the host because
each the virus envelope and the cell membrane are product of lipids.
Those viruses that don't enter the cell have to inject their contents (genetic commands,
enzymes) into the host cell. Those viruses that dissolve into a cellular certainly release their
contents as soon as in the host. In either case, the consequences are the identical.So virus would
not infect each cell.
Hope everything is clear and you like the answer.