Lesson 14: Virus and Bacteria

Question 1

Give three examples of a virus.

Answer 1

• Measles
• HIV
• Tobacco Mosaic Virus (TMV)

Question 2

How is measles spread?
What are the symptons?
How is it treated?

Answer 2

• Spread through airbourne droplets/ dircet contact.
• Symptons –> rash and fever
• Cannot be treaed: use painkillers.
• Avoid spread by isolating ptients/ vaccinations*

Question 3

How is HIV spread?
What are the symptons?
How is it treated?

Answer 3

• By bodily fluids/ sharing needles
• Suffer flu- like symptons: can lead to AIDS (unable to fight infection)
• Antiretroviral drugs slow development of HIV into AIDS.
• Avoid spread by using sterile needles and contraception*

Question 4

How is TMV spread?
What are the symptons?
How is it treated?

Answer 4

• Spread through contact between plants (direct/ farmers.)
• Leaves from green to mosaic. Reduced photosynthesis. Reduced growth.
• No cure
• Reduce spread by cleaning tools and removing infected plants*

Question 5

Give two bacterial diseases.

Answer 5

• Salmonella

- Gonorhoea

Question 6

How is Salmonella spread?
What are the symptons?
How is it treated?

Answer 6

• Unhygeinic food prep, not cooked thoroughly.
• Vomitting, abdominal cramps, diarrhoea.
• Using antibiotics
• All poultry are vaccinated against it/ food must be cooked properly*

Question 7

How is Gonorhoea spread?
What are the symptons?
How is it treated?

Answer 7

• Through sexual intercourse.
• Pain when urinating/ yellow, green discharge from vagina and penis.
• Using antibiotics however Gonorhoea is developing resistance.
• Prevent using contraception eg. condom*

Question 8

Why can’t antibiotics be used for viruses?

Answer 8

• Viruses are inside the cell .

- The antibiotic cannot reach the virus.