Use the Information Below as Background for the Following Questions

question 4

Multiple Choice

Use the information below as background for the following questions.
Immunodeficiencies may be genetic in origin. Two examples of these are Bruton's agammaglobulinemia, an X-linked disorder, and DiGeorge syndrome, caused by a deletion from chromosome 22. Bruton's results in underdeveloped B cells, while DiGeorge syndrome results in a missing or seriously underdeveloped thymus.
-Which of the following could prevent the appearance of the symptoms of an allergy attack?

• A)blocking the attachment of the IgE antibodies to the mast cells
• B)blocking the antigenic determinants of the IgM antibodies
• C)reducing the number of helper T cells in the body
• D)reducing the number of cytotoxic cells
• E)reducing the number of natural killer cells

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Definitions:

100 MHz

A frequency often associated with the operational frequency of certain NMR spectrometers, crucial for inducing transitions between nuclear spin states in proton NMR.

Electronegative Atoms

Atoms with a high ability to attract electrons towards themselves, which affects bond polarity and molecular structure.

Deshielded

A term used in nuclear magnetic resonance (NMR) to describe a nucleus whose electron cloud is perturbed in such a way as to reduce the shielding effect, often leading to an upfield shift in the NMR spectrum.

Dibutyl Ether

An organic compound formed by the dehydration of butanol, used as a solvent and in chemical synthesis.