X-linked hyper IgM syndrome, resulting in high levels of serum IgM and low levels of serum IgG, is caused by a defect in CD40L expression. The specific immune event that would be prevented by a defective CD40L would be activation of B cells by T-independent antigens failure of B cells to provide co-stimulation for Th2 activation failure of Th2 cells to provide co-stimulation for B cell isotype switching failure of Th2 cells to provide co-stimulation for B cell proliferation TRUE ANSWER : ? YOUR ANSWER : ?
Specific translocations are associated with breast cancer pancreatic cancer some leukemias colon cancer TRUE ANSWER : ? YOUR ANSWER : ?
The primary reason for AIDS, a deadly disease is that it is caused by a bacterium destroys key components of the body's internal defense system is caused by a virus causes a breakdown of the body's inflammatory response TRUE ANSWER : ? YOUR ANSWER : ?
The chemical, typically released by the body in an allergic response is allergens histamine antihistamines perforins TRUE ANSWER : ? YOUR ANSWER : ?
A monoclonal antibody (mAb) specific for the 2,4-dinitrophenyl (DNP) hapten might also bind Ser or Thr Tyr or Phe His or Pro Leu or Ileu TRUE ANSWER : ? YOUR ANSWER : ?
DiGeorge's syndrome is characterized by the lack of a thymus The mouse model closest to this human disease would be a nude mouse recombinant mouse for CD3 knock-out mouse for a thymus knock-out mouse for RAG-1 and RAG-2 TRUE ANSWER : ? YOUR ANSWER : ?
Retinoblastoma is due to a mutation in a tumor supressor kinase viral gene cyclin TRUE ANSWER : ? YOUR ANSWER : ?
Which of the Rous sarcoma virus has a homologous cellular protein? c-src v-ha-ras v-ha-src v-src TRUE ANSWER : ? YOUR ANSWER : ?
Combined cellular and humoral immune deficiencies result from lack of all of the following except transporter of antigen peptides (TAP) a thymus HIV infection of CD4+ T cells class II MHC TRUE ANSWER : ? YOUR ANSWER : ?