12.1 Animal And Plabt Pathogens

Question 1

What causes communicable diseases?

Answer 1

Pathogens

Question 2

What are pathogens?

Answer 2

Organisms that cause disease

Bacteria, viruses, fungi, and protoctista

Question 3

What is a vector?

Answer 3

Something that carries pathogens from one organism to another

Question 4

What are the two ways in which bacteria can be classified?

Answer 4

1. By their basic shapes
   rod (bacilli), spherical (cocci), comma shaped (vibrios), spiralled (spirilla) and corkscrew (spirochaetes)
2. By their cell walls
   Gram positive bacteria: purple-blue under the light microscope
   Gram negative bacteria: red under light microscope

Useful because the type of cell wall affects how bacteria react to different antibiotics