Question

The immune system responds differently to pathogens that infect intracellularly, such as viruses, than it does...

The immune system responds differently to pathogens that infect intracellularly, such as viruses, than it does when responding to extracellular pathogens, like most bacteria.

The MMR vaccine is a combination vaccine used against three viruses. Our bodies develop immunity through a series of steps that result in the activation of cytotoxic T cells against virally-infected cells. Place the following steps for T cell activation in the correct order.

First Step to Last Step:

Options:

A helper T cell binds to
the MHC-II protein of
an infected dendritic cell.

The dendritic cell secretes
IL-12 to differentiate
the helper T cell into
a type 1 helper T cell.

Dendritic cells infected with
the virus migrate to
lymph nodes.

Activated cytotoxic
T cells undergo
clonal expansion.

The type 1 helper
T cell secretes IL-2
to activate the cytotoxic
T cell.

Activated cytotoxic
T cells self-stimulate
and leave the lymph node.

A cytotoxic T cell binds to
the MHC-I protein of
an infected dendritic cell.

Homework Answers

Answer #1

The exact sequence of the T-cell activation is:

I. Dendritic cells infected with the virus migrate to the lymph node.

II. A cytotoxic T cell bind to the MHC-I protein of an infected dendritic cell.

III. A helper T cell binds to the MHC-II protein of infected dendritic cell.

IV. The dendritic cell secretes IL-12 to differentiate the T-helper cell into type 1 helper cell.

V. The type 1 helper T Cell secrete IL-2 to activate the cytotoxic T cell.

VI. Activated cytotoxic T cell undergo clonal expansion.

VII. Activated cytotoxic T cell self-stimulate and leave the lymph node.

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