37) Unit 2 - The Parasitic Life Cycle and Viruses Flashcards
1
Q
Name and describe common parasites
A
- Protists - single celled organisms
- Platyhelminths - flat worms
- Nematodes - round worms
- Arthopods - invertebrates with joint legs, segmented bodys and exoskelaton
- bacteria
- virus
2
Q
how are ectoparasites transmitted
A
direct contact
3
Q
how are endoparasites of body cavities transmitted
A
direct contact or consumption of intermediare/secondary host
4
Q
how are endoparasites of body tissue transmitted
A
vectors
5
Q
name a human disease caused by a parasite
A
malaria
6
Q
what are viruses
A
infectious agents that can only replicate inside a host
7
Q
What do viruses contain
A
DNA or RNA packed in a protective protein coat
8
Q
what do the outer membrane/surface of viruses contain
A
antigens which may or may be detected as foreign by a host
9
Q
what is a retrovirus
A
contain RNA instead of DNA
10
Q
how do retroviruses infect hosts
A
- Their RNA is converted into DNA using enzyme reverse transcriptase.
- This DNA is then inserted into the host cells genome
- When transcribed, new viral proteins are formed that can infect host
