Question: 1- Cytotoxic T Cells Express Which Of The Following Proteins On Their Cell Surface? (Select All That Apply) A. T Cell Receptor (TCR) B. CD8 C. CD4 D. B Cell Receptor 2- Which Of The Following Statements Is The Most Accurate Concerning Lymphocytes? A. T Cells And B Cells Both Express TCRs. These Are The Product Of Approximately 100 Genes. Each Lymphocyte …

1-

Cytotoxic T cells express which of the following proteins ontheir cell surface? (Select all that apply)

a.

T cell receptor (TCR)

b.

CD8

c.

CD4

d.

B cell receptor

2-

Which of the following statements is the most accurateconcerning lymphocytes?

a.

T cells and B cells both express TCRs. These are the product ofapproximately 100 genes. Each lymphocyte expresses only one of the~100 receptors coded for by these genes, and in the absence ofclonal selection the liklihood that two cells express the samereceptor is only moderate

b.

T cells and B cells express TCRs and BCRs respectively. Theseare the product of genetic recombination and can comprise one ofmillions of combinations. Each lymphocyte can express 1000s ofdifferent receptor variants, maximizing the likelihood that asingle adaptive immune cell will recognize pathogen-associatedantigens.

c.

T cells and B cells express TCRs and BCRs respectively. Theseare the product of genetic recombination and can comprise one ofmillions of combinations. Each lymphocyte expresses only one ofthese receptors, and in the absence of clonal selection theliklihood that two cells express the same receptor is exteremelylow.

d.

T cells and B cells express TCRs and BCRs respectively. TCRsdirectly bind to MHC-I facilitating destruction of abhorrent cellsby T-lymphocytes. In contrast, BCRs bind MHC II, allowing B cellsto destroy MHC II-expressing pathogens.