Biology Quiz on Infection and Immunity

Which of the following is a chemical barrier to infection?

• Cilia in the trachea

• Skin

• Hydrochloric acid in the stomach

• Nose hairs

Which disease is transmitted mainly through body fluids such as blood or semen?

• Athlete’s foot

• HIV/AIDS

• Cholera

• Malaria

The purpose of mucus in the airways is to:

• Produce antibodies

• Trap dust and microorganisms

• Increase oxygen absorption

• Kill pathogens with acid

Which group of pathogens cannot reproduce outside a host cell?

• Bacteria

• Fungi

• Viruses

• Protozoa

Which of the following controls fly-borne disease most effectively?

• Taking antibiotics regularly

• Covering and properly disposing of rubbish

• Eating more vitamin-rich foods

• Wearing gloves indoors

The white blood cells that engulf and digest bacteria are:

• Lymphocytes

• Phagocytes

• Cilia

• Antibodies

An example of a disease spread through contaminated food or water is:

• Influenza

• Tuberculosis

• Cholera

• Athlete’s foot

Vaccination provides protection because it:

• Instantly kills all pathogens

• Stimulates lymphocytes to produce memory cells

• Strengthens the skin’s dead layer

• Increases mucus production

The movement of cilia in the respiratory tract helps to:

• Move air into the lungs

• Push mucus containing trapped microbes towards the throat

• Kill pathogens with enzymes

• Produce antibodies

Protozoa such as Plasmodium cause which disease?

• Tuberculosis

• Malaria

• HIV/AIDS

• Influenza