How is a T-cell receptor different from a B-cell receptor?
A) T-cell receptors must have antigen broken down inside a cell and presented to them by a major histocompatibility complex (MHC) molecule.
B) B-cell receptors must have antigen broken down inside a cell and presented to them by a major histocompatibility complex (MHC) molecule.
C) T-cell receptors are composed of four protein chains (pieces), while B-cell receptors are composed of only two chains.
D) T-cell receptors are eventually secreted into the bloodstream by activated T-cells, whereas B-cell receptors are not; they always stay with the B-cell.
E) B-cell receptors are composed of chains of amino acids, while T-cell receptors are composed of chains of carbohydrates.

Question

How is a T-cell receptor different from a B-cell receptor?
A) T-cell receptors must have antigen broken down inside a cell and presented to them by a major histocompatibility complex (MHC) molecule.
B) B-cell receptors must have antigen broken down inside a cell and presented to them by a major histocompatibility complex (MHC) molecule.
C) T-cell receptors are composed of four protein chains (pieces), while B-cell receptors are composed of only two chains.
D) T-cell receptors are eventually secreted into the bloodstream by activated T-cells, whereas B-cell receptors are not; they always stay with the B-cell.
E) B-cell receptors are composed of chains of amino acids, while T-cell receptors are composed of chains of carbohydrates.

Quizplus · Accepted Answer

T-cell receptors can only recognize antigens that are processed and presented by MHC molecules on the surface of other cells, while B-cell receptors can directly recognize antigens that are floating freely in the extracellular fluid. This is because T-cell receptors are involved in cell-mediated immunity, while B-cell receptors are involved in humoral immunity. Additionally, both T-cell and B-cell receptors are composed of four protein chains, and neither are composed of chains of carbohydrates.

How Is a T-Cell Receptor Different from a B-Cell Receptor