Question

3
Subject Test
You are attempting question 20
A human volunteer showed a typical skin reaction when ragweed antigen (allergen) is given
to him intradermally. Thus, the person showed a typical hypersensitivity reaction. However,
if he is injected with sensitizing TgE (at the same site) before injecting F. fragments of
human IgE followed by intradermal injection with allergen. Which of the following
observations can be observed?
a. Fe fragments prevent the allergen from gaining access to mast cells and thus, no reaction
would take place.
b. Fe fragments would bind with IgE antibodies due to which antigen-binding sites of
antibodies will not be available for binding to antigen due to which no reaction will take
place
c. F. fragments will interact with Fereceptors present on mast cells due to which no reaction
would take place
d. The reaction would increase due to increased concentration of IgE F. fragments.
Answer

Answer 1

I think the correct option will be a.

Answer 2

Answer:

Explanation:answer is c