Parasite Life Cycle and Viruses Flashcards
What is a retrovirus ?
A viruses that contains RNA as its nucleic acid rather than DNA.
Along with injecting their RNA into the host cell,what else do retroviruses inject into the cell
What is the role of the other element injected into the host cell ?
The enzyme reverse transcriptase - its role is to synthesis DNA from the single stranded RNA that can then be inserted into the host cells genome.
Give an example of a retrovirus ..
HIV
Give five examples of common parasites …
Bacteria Viruses Nematodes Anthropods Protists ( single cells organisms ) Platyhelminthes
State how endoparasites of the body cavities and body tissues are transmitted…
Body cavities : in direct contact or consumption of the secondary host
Body tissues : via vectors
How does the lipid membrane surrounding the viruses help it ?
It’s assists the viruses in remaining undetected by the host cell since the lipid membrane is composed of host cell materials.
Viruses are composed of _____ acid enclosed inside a ______ coat and the outer surface of a virus contains ______ that the host cells may or may not be able to detect as foreign.
Nucleic
Protein
Antigens
What units of measurement are used for viruses and what is the generally size range of viruses
nm
20-400nm
A challenge in the treatment of parasites is they are difficult to culture in a lab ,why is this a problem ?
As scientist find it tricky to work with them to find out more about the parasite
What is the issues with treatment and control of parasite related to rapid parasite antigen ?
Makes designing long lasting vaccines difficult.
What is it a bad thing that the host cell and parasites metabolism is very similar …
Difficult to develop drugs that target the parasite without harming the host
Controlling parasites is easier where ______ ___________has resulted in effective sanitation…
Civil engineering
A) what is vector control
B) why is parasite control harder in tropical climates
A ) where the vectors that transmit the parasite are targeted such as DDT and mosquitoes
B) as there is a large population of insect vectors
Where parasite control is increasing, child mortality is ….
Decreasing
