The T Cell Receptor (TCR)complex Differs from an Immunoglobulin Molecule

question 17

Multiple Choice

The T cell receptor (TCR) complex differs from an immunoglobulin molecule in which one of the following ways?

• A)On average,a TCR binds antigen with much lower affinity than does an Ig molecule.
• B)The TCR can serve as a lymphocyte antigen receptor,but an Ig molecule cannot.
• C)Only the TCR can bind soluble antigen directly.
• D)The TCRs expressed by one clone of T cells can undergo changes in constant region structure after cellular activation,whereas Ig molecules expressed by one clone of B cells do not.
• E)The TCR polypeptide chains have short cytoplasmic tails and rely on associated proteins for signaling functions,whereas membrane Ig receptors are competent signaling molecules on their own.

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Definitions:

Predetermined Overhead Rate

A rate used to allocate indirect costs to products or services, estimated before the costs are incurred.

Direct Material

Raw materials directly used in the manufacturing of a product, explicitly traceable to the goods being produced.

Direct Labor

Labor costs directly tied to the production of goods or services, such as wages for assembly line workers.

Probability Distributions

Mathematical functions that provide the probabilities of occurrence of different possible outcomes for an experiment.