Following are the defenses of the colon except sIgA fast flow rate dense resident microbiota mucus TRUE ANSWER : ? YOUR ANSWER : ?
Treatment with bacterial endotoxins results blast formation in monocytes T cells B cells none of these TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is correct for isoantigens? They are antigens found in all members of a species They are antigens found in all members of different species They are antigens found in some members of a species They are antigens found in some members of different species TRUE ANSWER : ? YOUR ANSWER : ?
Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated? By rearrangements of the DNA encoding the variable regions of the heavy and light chains Antibody proteins can physically change their shape to bind different epitopes Both (a) and (b) By the combination of different heavy and light chains that form the antigen binding site TRUE ANSWER : ? YOUR ANSWER : ?
Cytotoxic T-cells can be recognized by which of the following cell surface marker? CD9 CD7 CD8 CD4 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following proteins would not need localization signal? A cytosolic protein A cell surface protein A protein bound to the endoplasmic reticulum (ER) membrane A nuclear protein TRUE ANSWER : ? YOUR ANSWER : ?
Large parasites such as helminthes may be killed extracellularly by the action of neutrophils eosinophils basophils monocytes TRUE ANSWER : ? YOUR ANSWER : ?
T cell receptors (or TCR) on CD4+ T cells are secreted out into the environment to bind antigens recognize peptides not associated with MHC molecules recognize peptides associated with MHC class I molecules recognize peptides associated with MHC class II molecules TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is correct for CD8 T cells? CD8 T cells only recognize virus-infected cells CD8 T cells can kill individual virus-infected cells in a contact dependent fashion In the thymus, CD8 T cells undergo positive selection only, whereas CD4 T cells undergo negative selection only CD8 T cell receptor recognizes epitopes that are also commonly recognized by B cells TRUE ANSWER : ? YOUR ANSWER : ?
Polymorphonuclear leukocytes (or PMNs) can be attracted to the site of an infection following activation of complement are derived from bone marrow stem cells All of these are a type of phagocyte that can engulf and kill bacteria TRUE ANSWER : ? YOUR ANSWER : ?