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41. Write name of causative agent of pneumonia. List symptoms and modes of transmission.

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42. What is Immune system ? Mention the two types (components) of immune system.

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43. Briefly describe the cells of the immune system.

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44. Distinguish between B-cells and T-cells.

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45. Write structure of antibody (Immunoglobulin) molecule.

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46. Give the name and functions of four classes of antibodies.

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47.

How B-cells respond to antigens?

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48.

How T-cells respond to antigens?

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Differences between antibodies and interferons.

Antibodies

Interferons

1.Produced by B-cells only

2.They act against bacterial and viral infections.

1.Produced by T-cells.

2. They act against virus only.

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50. What is autoimmunity ? Explain.

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