Textbook Question
Mark each statement as either true or false. Rewrite false statements to make them true by changing the underlined words.
__________ Secretion of antibodies by activated B cells is a form of cell-mediated immunity.
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20. Adaptive Immunity
Introduction to B Lymphocytes
Multiple Choice
What is the difference between a TCR and a BCR?
A
TCRs must be presented an antigen on an MHC molecule from an APC.
B
BCRs must be presented an antigen on an MHC molecule from an APC.
C
TCRs mimic the structure of antibodies and are essentially the same.
D
BCRs are composed of amino acid chains & TCRs are composed of various carbohydrates.
E
TCRs are composed of amino acid chains & BCRs are composed of various carbohydrates.
Verified step by step guidance1
Understand the basic definitions: TCR stands for T-cell receptor, and BCR stands for B-cell receptor. Both are crucial components of the adaptive immune system.
Recognize the structural differences: TCRs and BCRs are both composed of amino acid chains, not carbohydrates. This eliminates the options suggesting they are composed of carbohydrates.
Identify the functional differences: TCRs require antigens to be presented on Major Histocompatibility Complex (MHC) molecules by Antigen-Presenting Cells (APCs). BCRs can recognize antigens directly without the need for MHC presentation.
Clarify the mimicry misconception: TCRs do not mimic the structure of antibodies. While they are similar in function, they have distinct structures and roles in the immune response.
Summarize the key distinction: TCRs are involved in recognizing antigens presented by APCs on MHC molecules, whereas BCRs can bind directly to antigens without MHC involvement.
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