Protoctists, Bacteria & Viruses

Question 1

State and explain the 3 characteristics of Protoctists.

Answer 1

1) Single celled + microscopic

2) Some have chloroplasts, similar to plant cells

3) Others like animal cells

Question 2

Provide and evaluate the 6 different characteristics of Protoctists.
Give examples.

Answer 2

1) Single celled + microscopic

2) No nucleus

3) Have a circular chromosome of DNA

4) Some photosynthesise

5) Most feed of other living or dead organisms

6) eg: lactobacillus bulgaricus + pneumococcus

Question 3

Provide and evaluate the 7 different characteristics of viruses.
Include examples.

Answer 3

1) Particles, not cells. Smaller than bacteria

2) Only reproduce inside living cells

3) Is a parasite, depends on another organism to grow + reproduce

4) Infect all types of living organisms

5) Come in many different shapes and sizes

6) No cellular structure, just protein coat around DNA or RNA

7) eg: Influenza virus, HIV, Tobacco Mosaic virus

Question 4

What is the definition of a Pathogen

Answer 4

= organisms that cause disease

Question 5

What are the Effects caused by examples of Protoctists, Bacterium & Viruses?

Answer 5

Protoctists = Plasmodium, causes malaria

Bacterium = Pneumococcus, causes pneumonia

Viruses = Influenza Virus, causes flu + HIV, which causes AIDS