Cluster of differentiation (CD) molecules are cell-bound proteins that have various functions in the immune response.  CD1 molecules are related to MHC Class 1 molecules, but they are not involved with presentation of protein antigens.  Which of the following best describes the action of CD1 molecules?

¿Cuándo utilizamos buenas noches? (select all that apply)

En el mundo hispanohablante, es común usar la hora militar. Si la hora de cenar es a las 21:00h, es a las:

A 60-year-old woman was diagnosed with rheumatoid arthritis.  The complement level in her blood was lower than normal.  Which of the following best explains the drop in complement level as related to her disease?  

In order to have a strong adaptive immune response, cells of the innate immune system need to work closely with cells of the adaptive immune system.  Which of the following combinations is the best example of innate cells interacting with cells from the adaptive immune system to increase an adaptive immune response?

Polymorphonuclear cells (PMNs) are activated when exposed to antigen.  Which of the following best explains the changes in PMNs following activation?

One of the earliest immune receptors to evolve is the Toll-like receptor (TLR).  Which of the following best describes TLRs?

Members of the immunoglobulin superfamily are involved in the recognition, binding, and adhesion processes of cells.  They share structural features with immunoglobulins, including characteristic domains and folds.  Which of the following is a member of the immunoglobulin superfamily?

The major histocompatibility complex (MHC) is best described by which of the following statments?

A 65-year-old man goes to the doctor with a severe backache.  He is diagnosed with ankylosing spondylitis, an arthritic disease that is considered linked to HLA B27.  Which of the following best explains the meaning of ankylosing spondylitis being linked to HLA B27?