Topical Test B13 Diseases & Immunity

What is a common feature of both active and passive immunity?

• They are acquired by vaccination.

• They are always short-term.

• They involve the activity of memory cells.

• They involve antibodies.

What is a disease-causing organism called?

• antibody

• host

• pathogen

• phagocyte

Which blood component is destroyed in people who are HIV positive?

• lymphocytes

• phagocytes

• platelets

• red blood cells

Penicillin is an antibiotic that kills bacteria by preventing them from forming cell walls. Why does penicillin not affect viruses?

• Viruses become resistant to penicillin.

• Viruses do not contain cytoplasm.

• Viruses do not have cell walls.

• Viruses reproduce very rapidly.

Which component of the blood produces antibodies?

• lymphocytes

• phagocytes

• plasma

• red blood cells

Which statement about antibodies is correct?

• Breast milk contains antibodies and protects babies by giving them active immunity.

• Injections of antibodies give passive immunity against the disease scurvy.

• Insect repellents contain antibodies and give mosquitoes passive immunity against malaria.

• Injections of antibodies give passive immunity against some pathogens.

The body has defences to protect itself from diseases. What is a mechanical barrier to diseases?

• hairs in the nose

• plasma

• stomach acid

• white blood cells

What is a consequence of HIV infection on the human body?

• decreased lymphocyte numbers

• increased protection against bacterial infection

• increased haemoglobin production

• sickle anaemia

What happens when a child is vaccinated against tuberculosis?

• type of immunity: active, production of memory cells: no

• type of immunity: active, production of memory cells: yes

• type of immunity: passive, production of memory cells: no

• type of immunity: passive, production of memory cells: yes

Which part of a pathogen is recognised by the immune system?

• active site

• antibiotic

• antibody

• antigen