exam questions

• why is it difficult to develop drugs that kill viruses?


  Bc they might damage our body tissue
• glucose test?


  • benedicts solution
  • heat
  • blue to brick red if glucose present
• Table 1 shows the results of a study in one area of Africa

  ‘Study shows mosquito nets are scientifically proven to prevent malaria.’

  Suggest one reason why the statement may not be valid.

  From only one part of Africa
• Using a condom can stop the bacteria being passed to another person during sexual intercourse.

  Suggest a different way the man could avoid passing the bacteria on to someone else.

  Abstaining from sexual intercourse
• Give two ways a person with a mild infection of Salmonella can help prevent the spread of the bacteria to other people

  • isolating themselves
  • washing hands before food prep
• A person with AIDS may take longer than a healthy person to recover from a Salmonella infection.

  Explain why.

  • immune system is weakened
  • white blood cells cannot kill bacteria
• Salmonella bacteria can be transmitted from chickens to humans.

  Chickens can be vaccinated to prevent the transmission of Salmonella bacteria to humans.

  Suggest one other way farmers could prevent the transmission of Salmonella from chickens to humans.

  isolating infected chickens
• A virus called RSV causes severe respiratory disease.

  Suggest two precautions that a person with RSV could take to reduce the spread of the virus to other people.

  • regular hand washing
  • not sharing cutlery with not infected people
• A trial was carried out to assess the effectiveness of using monoclonal antibodies to treat patients with RSV.

  Why were some patients given a placebo?

  As a control
• Malaria is a disease spread by mosquitoes.

  Describe two ways to control the spread of malaria.

  • stop breeding
  • mosquito nets
• The use of antibiotics has not reduced the death rate due to all diseases to zero.

  Suggest two reasons why

  • bacteria are resistant to antibiotics
  • course not completed
• The MMR vaccine protects people against three diseases.

  measels, mumps, rubella
• Why will antibiotics not get rid of flu?

  antibiotics don't kill viruses
• Legal non-prescribed drugs have a greater impact on the health of the population than illegal drugs.

  Suggest two reasons why.

  • more readily available
  • tobacco causes cancer
• Suggest one other factor that a doctor might consider before deciding which treatment to use for a patient.

  cost/side effects
• The genetic material is arranged differently in the cells of bacteria compared with animal and plant cells.

  Describe two differences.

  • plasmids
  • circular DNA
• Suggest how a vaccination programmed would reduce the number of people with TB.

  Details of how a vaccine works are not required.

  provides immunity, prevents spread and therefore herd immunity
• protein test?

  • biuret solution
  • turns purple