4.1 Protoctist Disease Flashcards Preview

A Level Biology > 4.1 Protoctist Disease > Flashcards

Flashcards in 4.1 Protoctist Disease Deck (28):
1

What are protoctists?

Eukaryotic organisms with a variety of feeding mechanisms

2

They are single celled and group into what?

Colonies

3

How are they transferred to hosts?

Vectors E.g. Malaria by mosquitos

4

Give an example of a protoctist affecting humans:

Malaria

5

(Malaria) what is malaria spread by?

Female mosquitoes

6

(Malaria) what are the symptoms?

Fever
Sweats
High temp
Headaches
Vomiting
Muscle pain

7

(Malaria) what parasite causes malaria?

The plasmodium parasite

8

(Malaria) how is malaria spread?

Mosquito passing it into the bloodstream
Needles and blood transfusion

9

(Malaria) how many deaths did it cause in 2013?

584000

10

(Malaria) how can it be prevented?

Insect repellents
Nets
Antimalarial tablets

11

(Malaria) if left malaria can cause serious complications such as what?

Severe anaemia
Cerebral malaria - brain damage and seizures

12

(Malaria) 1. The mosquito injects what into the humans bloodstream?

saliva
Anti coagulants - stop blood clotting

13

(Malaria) 1. The saliva contains malarial paradises in the form of what?

Sporozoites

14

(Malaria)2. The sporozoites enter the liver where they do what?

Multiply and develop into merozoites
Leave liver

15

(Malaria) 3. Merozoites invade what?

Red blood cells where they feed and multiply

16

(Malaria) 3. The merozoites burst the RBCs causing what?

Fever

17

(Malaria) 4. Some merozoites invade other red blood cells developing into what?

Gametocytes

18

(Malaria) 4. If the host is bitten by a vector what can happen to these cells?

Taken up

19

(Malaria) 5. In the mosquito the gameocytes develop into what?

Gametes

20

(Malaria) 5. Male and female gametes form a sporozoite which does what?

Migrates to the salivary gland

21

What is a disease caused by protoctist in plants?

Potato/tomato late blight

22

(Late blight) what is it caused by?

Phytophthora infestants

23

(Late blight) what does it cause?

Black lesions in leaves and stems that rapidly expand

24

(Late blight) humid conditions cause what on the surface of infected tissue?

Spores

25

(Late blight) what can happen within days?

Entire plant is destroyed

26

(Late blight) infected tubers turn what colour?

Red brown

27

(Late blight) infected tubers are often invaded by what?

Soft rot bacteria

28

What mode of action do protoctists take?

Take over cells and break them open as a new generation emerge

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