Using cultured T cells, researchers have been able to describe the basic steps of the T-cell receptor signaling pathway. Generally, what is the model for the signaling pathway?

The mechanism by which CTLA-4 inhibits T cell activation is by recruiting inhibitory phosphatases.

Cytotoxic T cells have the ability to kill a series of infected cells very rapidly. What CTL mechanism is enabled for this function?

What is the result when a mature T cell interacts with a self-antigen on a dendritic cell in the absence of an infection?

What happens when B cells bind antigens? Describe the steps involved and the outcomes.

B-1 B cells are an important part of the innate immune response. Unlike other B cells, they can produce antibodies early in infection because they do not require which of the following?

Second messengers, such as calcium ions (Ca2+), are chemical mediators commonly used in intracellular signaling pathways

For an autoreactive receptor, an encounter with the self-antigen results in strong cross-linking of IgM receptor. Which if the following applies for continued gene rearrangement?

B cell development in the bone marrow is an inherently wasteful process. Nearly half of the pro-B cells produced will die without progressing to the next stage of development. This massive loss of pro-B cells is due to

In comparing Brazilian independence with that in Spanish America, which of the following is true?