lecture 16 true and false quiz- immunology
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Questions and Answers

CD8+ T cells differentiate into effector CTLs during chronic infections like HIV or HCV.

False

Exhausted CTLs exhibit enhanced cytokine production and reduced expression of inhibitory receptors like PD-1.

False

T cell exhaustion is a phenomenon observed only during acute infections.

False

T cell exhaustion can contribute to the persistence of chronic infections but not cancer.

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

CTLs kill target cells mainly through fas/FasL-mediated cell killing.

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

Effector CTLs recognize and engage with infected target cells displaying the specific antigen on their surface through binding of CD4 molecules.

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

CTLs release cytokines, such as interferons, which directly induce apoptosis in the target cell.

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

Perforin forms pores in the target cell membrane, allowing the entry of granzymes into the nucleus.

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

CTLs play a minimal role in immune surveillance against cancer due to the specificity of tumor antigens.

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

T helper cells can inhibit the differentiation of CTLs into effector cells.

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

Effector CTLs recognize and eliminate only infected cells, not abnormal cells.

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

Perforin forms pores in the target cell membrane, allowing the release of granzymes into the cytosol.

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

Effector CTLs produce cytokines that inhibit inflammation and suppress immune responses.

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

Naïve CD8+ T cells are most effectively activated by antigens presented by B cells.

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

Class I MHC molecules present extracellular antigens to CD8+ T cells.

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

Perforin is a pore-forming protein that causes target cell death by inducing apoptosis.

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

CTLs primarily kill target cells by releasing granzymes, which are serine proteases.

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

Cytotoxic granules in CTLs store molecules that are essential for inducing programmed cell death in target cells.

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

CTLs form an immune synapse with helper T cells to promote the differentiation of CTLs.

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

Fas/FasL-mediated cell killing is the primary mechanism through which CTLs induce apoptosis in target cells.

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

FasL is expressed on the surface of target cells that are being killed by CTLs.

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

Fas is a ligand for FasL in the process of CTL-mediated cell killing.

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

The interaction between FasL on CTLs and Fas on the target cell surface triggers apoptosis in the target cell.

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

The Fas/FasL-mediated cell killing pathway involves the interaction between Fas and FasL expressed on the same cell type.

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

CTLs can induce apoptosis in target cells through perforin/granzyme-mediated cell killing.

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

Perforin-mediated membrane disruption allows the entry of Bcl-2 into the cytoplasm of the target cell.

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

Granzyme-mediated cleavage of substrates leads to the inactivation of caspases.

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

Apoptosis is characterized by DNA duplication, nuclear expansion, and membrane expansion.

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

The process of CTL-mediated killing is slow, often taking days for the death of the target cell after CTL-target cell interaction.

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

CTLs kill target cells mainly through fas/FasL-mediated cell killing.

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

Effector CTLs acquire cytotoxic capabilities and migrate to the site of infection or inflammation.

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

Effector CTLs can release cytokines like interleukin-2 (IL-2) to induce apoptosis in target cells.

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

Naïve CD8+ T cells undergo clonal expansion upon activation, leading to the generation of a large pool of effector and memory T cells.

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

Chemokines guide the migration of effector CTLs and other leukocytes to the site of antigenic challenge in tissues or organs.

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

CTLs play a significant role in immune surveillance against cancer due to their ability to recognize and engage with tumor antigens on target cells.

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

T helper cells inhibit the differentiation of CTLs into effector cells during chronic infections like HIV or HCV.

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

Antigen cross-presentation occurs when DCs present endogenous antigens on MHC-I molecules to activate CD8+ T cells.

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

T cell exhaustion is only observed during chronic infections, not cancer.

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

Perforin forms pores in the target cell membrane that allow the entry of cytokines like interferons into the nucleus.

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

Effector CTLs primarily kill target cells through fas/FasL-mediated cell killing rather than perforin/granzyme-mediated killing.

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

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