Bacterial Infection in a Previously Uninfected House Cat Would Most

Question

Bacterial infection in a previously uninfected house cat would most quickly activate its
A)Toll-like receptors that bind to lipopolysaccharides.
B)memory cells to produce antibodies.
C)plasma cells to produce antigens.
D)cytotoxic T cells.
E)humoral immune responses.

Accepted Answer

Toll-like receptors (TLRs) are the first line of defense against bacterial infections. They recognize and bind to specific components of bacterial cells, such as lipopolysaccharides, triggering an innate immune response. This quick response is important for controlling the infection before more specific adaptive immune responses, such as antibody production, can be activated. Choice B, memory cells, and choice C, plasma cells, are both involved in adaptive immune responses and would not be the first to activate in a new infection. Choice D, cytotoxic T cells, are involved in cell-mediated immunity and would not be the first to activate against a bacterial infection. Choice E, humoral immune responses, is a general category that includes antibody production and would not be the first response to activate in a new bacterial infection.