1: Protozoans

Question 1

Describe the locomotion of the protozoans

Answer 1

Flagella
Cilia → metachronal waves
Pseudopodia → temporary extension of the body

Question 2

In what 2 ways can protozoans aquire food?

Answer 2

Phagocytosis
Pinocytosis

Question 3

How do protozoans reproduce?

Answer 3

Asexually

Question 4

Give an example of an Amoebozoan and describe its lifecycle

Answer 4

Entamoeba histolytica:
- Humans ingest: from faeces, infected food/water, insects
- Organisms break down the intestinal wall and can make their way to the blood system
- Once in blood system, can go to liver, lungs / brain
- Kills 55,000/yr

Question 5

What is a commensal protozoan?

Answer 5

Live on the surface of the body or at mucosa without harming human health

Question 6

Give an example of an Apicomplexan

Answer 6

Plasmodium → causes malaria

Question 7

Describe the lifecycle of Plasmodium

Answer 7

1. Mosquito has sporozoites, when it bites human these enter the bloodstream, go to the liver
2. They divide and penetrate the RBCs → intracellular parasite
3. Now called trophozoites, inside RBCs they reproduce and burst out = fever symptom
4. Trophozoites → gametocytes. Infected human is bitten by mosquito they sexually reproduce in gut and they move to the salivary glands
   = cycle repeats