lecture 9 true and false quiz- immunology
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Questions and Answers

MHC class I molecules present peptides derived from extracellular proteins to CD4 T cells.

False

There are three main classes of MHC cell surface proteins.

False

The peptide-binding cleft of MHC molecules contains few polymorphic amino acids.

False

MHC gene loci were identified in research on immune responses related to allergies.

<p>False</p> Signup and view all the answers

Class II HLA gene loci encode for alpha and gamma chains.

<p>False</p> Signup and view all the answers

MHC class I molecules are primarily expressed on the surface of antigen-presenting cells.

<p>False</p> Signup and view all the answers

Class II MHC molecules present peptides derived from intracellular proteins.

<p>False</p> Signup and view all the answers

Peptide binding in the cleft of MHC molecules involves nonpolymorphic amino acids.

<p>False</p> Signup and view all the answers

Dendritic cells, macrophages, and B cells play a minimal role in antigen capture and presentation.

<p>False</p> Signup and view all the answers

MHC gene loci were not identified through work on tissue transplantation.

<p>False</p> Signup and view all the answers

The peptide-binding cleft contains many polymorphic amino acids.

<p>True</p> Signup and view all the answers

Antigen-presenting cells activate CD4 T lymphocytes.

<p>True</p> Signup and view all the answers

MHC gene loci were identified in work on tissue transplantation.

<p>True</p> Signup and view all the answers

There are two main classes of MHC cell surface proteins.

<p>True</p> Signup and view all the answers

Class II HLA gene loci code for alpha and gamma chains.

<p>False</p> Signup and view all the answers

Class I MHC molecules are recognized by CD4+ helper T cells.

<p>False</p> Signup and view all the answers

Polymorphic genes encode for the antigen-binding regions of MHC molecules.

<p>True</p> Signup and view all the answers

MHC haplotypes refer to the complete set of MHC alleles present on both chromosomes inherited from a single parent.

<p>False</p> Signup and view all the answers

There are nonpolymorphic genes encoded at the MHC locus that solely regulate immune responses and antigen processing.

<p>False</p> Signup and view all the answers

The peptide-binding cleft of MHC molecules contains few polymorphic amino acids.

<p>False</p> Signup and view all the answers

Class II MHC molecules are primarily expressed on the surface of dendritic cells, macrophages, and T cells.

<p>False</p> Signup and view all the answers

Class I MHC molecules are composed of an alpha chain and a gamma-2 microglobulin chain.

<p>False</p> Signup and view all the answers

Class I MHC molecules are expressed on the surface of almost all nucleated cells in the body.

<p>True</p> Signup and view all the answers

The peptide binding cleft of Class II MHC molecules is formed by the alpha1 and beta2 domains.

<p>False</p> Signup and view all the answers

MHC gene loci were identified in work on tissue transplantation.

<p>True</p> Signup and view all the answers

T Cell Receptors (TCRs) consist of two protein chains: α and β for γδ T cells.

<p>True</p> Signup and view all the answers

Peptides presented by MHC molecules on the cell surface are usually 15-20 amino acids in length.

<p>False</p> Signup and view all the answers

Dendritic cells, macrophages, and B cells are examples of T cell receptors (TCRs).

<p>False</p> Signup and view all the answers

MHC class I molecules present peptides derived from intracellular proteins to CD4 T cells.

<p>False</p> Signup and view all the answers

The peptide-binding cleft of MHC molecules contains few polymorphic amino acids.

<p>False</p> Signup and view all the answers

The peptide binding cleft of Class II MHC molecules allows longer peptides to bind compared to Class I MHC molecules.

<p>True</p> Signup and view all the answers

Peptides derived from extracellular proteins are taken up by dendritic cells for processing and loading onto Class II MHC molecules.

<p>True</p> Signup and view all the answers

The peptide binding cleft of Class I MHC molecules is open at both ends.

<p>False</p> Signup and view all the answers

MHC class I molecules primarily present peptides derived from intracellular proteins to CD4+ helper T cells.

<p>False</p> Signup and view all the answers

Peptides bind to the peptide binding cleft of MHC molecules via interactions with nonpolymorphic amino acids.

<p>False</p> Signup and view all the answers

MHC gene loci were identified through research on allergic responses.

<p>False</p> Signup and view all the answers

There are three main classes of MHC cell surface proteins.

<p>False</p> Signup and view all the answers

Class II HLA gene loci encode for alpha and gamma chains.

<p>False</p> Signup and view all the answers

Antigen-presenting cells play a minimal role in activating CD4+ helper T cells.

<p>False</p> Signup and view all the answers

MHC cell surface proteins present peptide antigens to B cell receptors for immune response initiation.

<p>False</p> Signup and view all the answers

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