B3 Infection and Response

Question 1

Pathogens

Answer 1

Microorganisms that enter the body and cause disease
Can cause communicable diseases
Can infect plants and animals

Question 2

Bacteria

Answer 2

Very small cells
Can reproduce rapidly inside your body
Make you feel ill by producing toxins (poisons) that damage your cells and tissues

Question 3

Viruses

Answer 3

Not cells
Much smaller than bacteria
Can reproduce rapidly inside the body and make cells burst

Question 4

Protists

Answer 4

Many different types
Mostly single-celled
Some are parasites

Question 5

Parasites

Answer 5

Live on or inside other organisms
Can cause them damage
Often transferred to the organism by a vector

Question 6

Vector

Answer 6

Carries a disease
Doesn’t get the disease itself
For example, an insect that carries a protist

Question 7

Fungi

Answer 7

Some are single-celled, others have a body
The body is made up of hyphae, which can grow and penetrate the skin of organisms
The hyphae can produce spores, which can spread to other plants and animals

Question 8

How can pathogens spread?

Answer 8

Drinking or bathing in dirty water (cholera)
Breathing in air containing droplets produced when you cough or sneeze (flu)
Direct contact with contaminated surfaces