iGCSE Biology 2h: Immune system

What is the primary function of the lymphocytes in the body?

• To produce antibodies

• To produce anti-histamines

• To recognize foreign antigens

• To perform phagocytosis

Antibodies are specific and complimentary to:

• Antibiotics

• Antigens

• Anti-inflamatories

• Anti-histamines

Immune cells that engulf pathogens are called:

• Lymphocytes

• Phagocytes

• Hepatocytes

• Thrombocytes

Antigens are:

• Chemicals that kill bacteria and fungal pathogens

• Produced in response to allergens

• Immune proteins produced by lymphocytes

• Specific surface marker proteins

Antibodies and antigens are complimentary, what does complimentary mean?

• Two objects that do not fit together

• Two objects that are the same shape

• Two objects that fit together

• An object that repels another

What are the "spikes" on the surface of the virus particle?

• Proteins that are essential to allow the virus to get inside a host cell

• Proteins that act as antigens allowing the immune system to recognize the virus

• Both A and B

How do vaccines provide immunity to measles without causing the disease?

• They contain weakened measles virus particles

• They contain measles virus antigens only

• They stimulate the body to produce memory cells

How do vaccines provide long-term immunity to measles?

• By containing weakened measles virus particles

• By stimulating the formation of memory cells

• By directly producing antibodies against the virus

Which of the following best describes the process of antibody production?

• Lymphocytes produce antibodies directly

• Lymphocytes divide to form plasma cells, which then secrete antibodies

• Antibodies are produced spontaneously in response to foreign antigens

• Memory cells produce antibodies by phagocytosis

Phagocyte nuclei are:

• Lobed

• Globular

• Spherical

• Linear