3.6 Sexually transmitted infections
5 exam questions worth 10 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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Name the type of pathogen that causes chlamydia and the type that causes HIV.
Mark scheme
- chlamydia: bacterium (1)
- HIV: virus (1)
Model answer
Chlamydia is caused by a bacterium and HIV by a virus.
Many people with chlamydia do not know they are infected.
Explain why this helps the infection to spread, and how screening can reduce the spread.
Mark scheme
- often no symptoms (1)
- so infected people do not get treated / continue to pass it on (1)
- screening finds infected people so they can be treated with antibiotics (1)
Model answer
Chlamydia often has no symptoms, so infected people do not seek treatment and keep passing it on. Screening finds these people so they can be treated with antibiotics.
Explain how using a condom reduces the spread of STIs.
Mark scheme
- acts as a barrier (1)
- stops body fluids / pathogens passing between partners (1)
Model answer
A condom acts as a barrier, stopping body fluids, and the pathogens in them, passing from one person to the other.
Give two ways the spread of HIV is reduced, other than using condoms.
Mark scheme
Any two from:
- needle exchange / not sharing needles (1)
- screening blood (donations) (1)
- antiretroviral drugs (1)
- avoiding breastfeeding by infected mothers (1)
Model answer
Needle exchange schemes so drug users do not share needles, and screening donated blood for HIV.
Which can be cured with antibiotics?
Choose one answer.
Correct Not quite: the answer is Chlamydia
Mark scheme
A: chlamydia
Model answer
A: chlamydia, because it is caused by a bacterium.
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