Answers
Answer [Q-13]: Option C. IgG
Explanation: It is the one that constitutes of 75% of all the Ig in our body. And it is the only that crosses the placenta in order to protect new born babies from infections.
Incorrect options:
- Rest all are developed in the baby itself, by various modes of immunity.
Answer [Q-14]: Option A. IgA
Explanation: IgA is the one that is found in many of the bodily secretions like tears, saliva, colostrum, mucus.
Incorrect options:
- Rest all are found in other places and not mainly in body secretions.
Answer [Q-15]: Option E. Are a portion of antigen recognized by antibody AND may be approximately 10-25 amino acids in length.
Explanation: Epitopes are the ones which are present on the antigen and are recognized by the immunity system of our body.
They are approx of the size between 10-25 amino acids.
Incorrect options:
- Option A: They are not part of the antibody, but of antigen.
- Option B: They are antigenic determinants and not T cell receptors. T cells are found in immune system.
Answer [Q-16]: Option A. plasma cells
Explanation: Antibodies are mainly made up of B cells and Plasma cells. Plasma cells are also white blood cells that secrete antibodies when an immune response is triggered.
Incorrect options:
- Natural Killer Cells secrete cytokine like IFN gamma.
- Phagocytes don't secrete antibodies. They engulf bacteria and completely tears it down.
- T cells also secrete cytokines.