Immunoglobulin (antibody) classes

Question 1

Most abundant antibody?

Answer 1

IgG (80%)

Question 2

Function of IgG

Answer 2

Protects against bacteria and viruses by enhancing phagocytosis, neutralising toxins and triggering complement

Question 3

Which is the only type of antibody that can cross the placenta?

Answer 3

IgG

Question 4

The second antibody involved in the primary response?

Answer 4

IgG

Question 5

First/most abundant antibody in the secondary response?

Answer 5

IgG

Question 6

Mainly found in sweat, tears, saliva, mucus, breast milk and GI secretions

Answer 6

IgA

Question 7

Levels decrease during stress, lowering resistance to infection

Answer 7

IgA

Question 8

Type III reactions involve antigens, antibodies and complement - which antibody?

Answer 8

IgG

Question 9

Occurs as pentamers

Answer 9

IgM

Question 10

First antibody class to be secreted by plasma cells after initial exposure to any antigen

Answer 10

IgM

Question 11

In blood plasma, anti-A and anti-B antibodies of the ABO blood group, which bind to A and B antigens during incompatible blood transfusions are also?

Answer 11

IgM

Question 12

First antibody involved in primary response

Answer 12

IgM

Question 13

Mainly found on the surfaces of B cells as antigen receptors

Answer 13

IgD

Question 14

Less than 0.1% of all antibodies

Answer 14

IgE

Question 15

Located on mast cells and basophils

Answer 15

IgE

Question 16

Provides protection against parasitic worms

Answer 16

IgE