Biology- Infection and response

Question 1

What is a communicable disease

Answer 1

A disease that can be spread from one person to another

Question 2

State the 4 types of pathogens

Answer 2

Virus, bacteria, fungi, protist

Question 3

What are the 3 examples of viral diseases

Answer 3

• Measles
• HIV
• Tobacco mosaic virus

Question 4

Measles: how its spread, treated and the symptoms

Answer 4

• Spread via droplets from an infected person’s sneeze or cough.
• treated through vaccination at young age
• symptoms include, red skin rash and signs of a fever
• Can be fatal (with complications)

Question 5

HIV: how its spread, treated and symptoms

Answer 5

• Spread by sexual contact or exchanging bodily fluids (sharing needles)
• Treated by antiretroviral drugs if found early enough (stops virus replicating)
• Symptoms: flu-like
• Virus attacks immune system- AIDS

Question 6

TMV: how its spread, treated and symptoms

Answer 6

• Spread by direct contact
• Can’t be treated
• Symptoms: mosaic pattern on leaf, parts of leaf discoloured
  —> discolouration means that plant cant carry out photosynthesis- so affects growth