Biology Multiple Choice Questions and Answers for Different Competitive Exams

MCQ on Antigen and Antibody

1. The second most abundant Ig is
a) IgM
b) IgG
c) IgA
d) IgE

2. The most effective Ig is
a) IgM
b) IgG
c) IgA
d) IgE

3. IgM is a
a) pentamer with 10 antigen binding sites
b) tetramer with 8 antigen binding sites
c) monomer with 2 antigen binding sites
d) dimer with 4 antigen binding sites

4.The Ig that mediates allergic reaction is
a) IgM
b) IgG
c) IgA
d) IgE

5. The Ig involved in host defence against parasitic infection (helminths)
a) IgM
b) IgG
c) IgA
d) IgE

6. The bonds involved in antigen-antibody interactions are
a) weak hydrogen bonds and vanderwalls forces
b) strong covalent bonds
c) strong di- sulphide bonds
d) all of these

7. Which of the following statement is true
a) all immunogens are antigens but all antigens are not immunogens
b) all immunogens are antigens and all antigens are immunogens
c) all immunogens are not antigens but all antigens are immunogens
d) all immunogens are proteins and all proteins are immunogens
8. Any agents that may stimulate the immune system and enhance the response without having any specific antigenic effect by itself.
a) antigens
b) allergens
c) adjuvants
d) carriers

9. Small chemical groups on the antigen molecule that can react with antibody
a) epitope
b) paratope
c) isotope
d) allotope

10. Which of the statements are true regarding antigen
a) generally self-molecules and molecules with low molecular weight are non-immunogenic
b) an antigen generally has many epitopes
c) heteropolymers are more immunogenic than homopolymers
d) all of these

Answers
1. c) IgA
2. a) IgM
3. a) pentamer with 10 antigen binding sites
4. d) IgE
5. d) IgE
6. a) weak hydrogen bonds and vanderwalls forces
7. a) all immunogens are antigens but all antigens are not immunogens
8. c) adjuvants
9. a) epitope
10. d) all of these

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