BackBinding of antigens to receptors of immunocompetent lymphocytes leads to clonal selection. Describe the process of clonal selection. What nonlymphocyte cell is a central actor in this process, and what is its function?
More than one choice may apply.
Which of the following antibody capabilities causes a transfusion reaction with A or B erythrocyte antigens?
a. Neutralization
b. Precipitation
c. Complement fixation
d. Agglutination
The clonal selection theory states that:
Which of the following is not involved in the activation of a B cell?
a. Antigen
b. Helper T cell
c. Cytokine
d. Cytotoxic T cell
Terrence has severe asthma and allergies, and is placed on a medication that blocks the functioning of IgE. How would this medication alleviate his symptoms?
Ted finds out that he has been exposed to measles. He is concerned that he might have contracted the disease, so he goes to see his physician. The physician takes a blood sample and sends it to a lab for antibody levels and titers. The results show an elevated level and activity of IgM antibodies to rubella (measles) virus but very few IgG antibodies to the virus. Has Ted contracted the disease?
Which of the following is NOT an organ where clonal selection occurs?
More than one choice may apply.
Which of these antibody classes is usually arranged as a pentamer?
a. IgG
b. IgM
c IgA
d. IgD
All of the following are postulates of the clonal selection theory EXCEPT:
Clonal selection: