What is a similarity between natural killer cells and cytotoxic T cells?
A. Both are activated in the presence of a specific antigen.
B. Both are capable of phagocytosis.
C. Both have transmembrane proteins that bind to MHC class I.
D. Both are a type of lymphocyte that has a cell-surface T cell receptor.
Which statement about hemoglobin is correct?
A. It allows deformation of erythrocytes during passage through the capillaries.
B. It is transported through the body by transferrin.
C. It contains a porphyrin ring surrounded by iron (Fe2+).
D. It is composed of different isoforms of a family of globular proteins.
Tamara is Rh negative and is expecting her first child with an Rh positive partner. As a child, she was mistakenly transfused with Rh positive blood. Should her doctors be worried about her pregnancy?
A. Yes because if she is injected with anti-D antibodies they will attack the antibodies that she already has in her blood.
B. Yes because she has immunological memory to the D antigen.
C. No because the gene coding for the D antigen is recessive so there is no chance that her fetus is Rh positive.
D. No because this is her first pregnancy
Which one of the following statements about C3a is correct?
A. It causes inflammation
B. It is required for activation of C5
C. It can enhance phagocytosis
D. It is part of the membrane attack complex
If bacteria are exposed to a B cell in the spleen, they will initiate a(n) ______________.
A. Humoral response
B. Cell-mediated response
C. Complement response
D. Inflammatory response