Significance Flashcards
1
Q
Give the two forms of virus existence
A
- Virion
- Vegetative virus
2
Q
Virion
A
- Inert particles transferring genetic information
- 20-300nm
- Contain:
- DNA/RNA
- Protein
- Lipid
3
Q
Vegetative virus
A
The infected cell
4
Q
Viral reproduction
A
- Multiplication: 103-106 virion/host cell
- No energy production/protein synthesis enzymes
- No nucleic acid replicating enzymes
- Cell parasites - ‘infectious genes’
5
Q
Emerging new virus examples
A
- Zika
- Influenza
- Ebola
- MERSV
- HIV
- SARSV
6
Q
Orphan viruses
A
Cause infection but no disease
7
Q
Most viruses of eukaryotes probably have been evolved from…
A
Prokaryotic viruses
(Bacteriophages)
8
Q
What is notable about the phylogeny of viruses?
A
They do not fit into the phylogenetic tree of living creatures
9
Q
Cell degeneration theory of virus evolution
A
- Cells lost their independence
- Outside of the cell only carries the information
10
Q
Runaway cell components theory of virus evolution
A
- mRNA → ssRNA virus
- Chromosome-fragment → dsDNA virus
11
Q
Similarities in the genome of the virus and the host cell
A
Runaway intermediate products of viral multiplication or evolution from ancient nucleic acids
12
Q
Viruses represent …% of the biomass
A
10%
