Which of the following proteins would not need localization signal? A protein bound to the endoplasmic reticulum (ER) membrane A cell surface protein A cytosolic protein A nuclear protein TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following statements is false regarding B cells? B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow B cells can undergo class switching and produce a different antibody type B one marrow stem cells migrate to the thymus and develop into B cells B cells synthesize antibodies and put them on their cell surface TRUE ANSWER : ? YOUR ANSWER : ?
Large parasites such as helminthes may be killed extracellularly by the action of eosinophils neutrophils basophils monocytes TRUE ANSWER : ? YOUR ANSWER : ?
Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated? Antibody proteins can physically change their shape to bind different epitopes By rearrangements of the DNA encoding the variable regions of the heavy and light chains Both (a) and (b) By the combination of different heavy and light chains that form the antigen binding site TRUE ANSWER : ? YOUR ANSWER : ?
T cell receptors (or TCR) on CD4+ T cells recognize peptides associated with MHC class II molecules recognize peptides associated with MHC class I molecules recognize peptides not associated with MHC molecules are secreted out into the environment to bind antigens TRUE ANSWER : ? YOUR ANSWER : ?
Which is not an antigen-presenting cell (or APC)? All of these B cell Polymorphonuclear leukocyte (or PMN) Dendritic cell TRUE ANSWER : ? YOUR ANSWER : ?
Polymorphonuclear leukocytes (or PMNs) can be attracted to the site of an infection following activation of complement All of these are a type of phagocyte that can engulf and kill bacteria are derived from bone marrow stem cells TRUE ANSWER : ? YOUR ANSWER : ?
Immunity is not long lasting to influenza mumps diphtheria whooping cough TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following(s) is/are the determinants of antigenicity? Foreignness Size of the antigen Chemical nature All of these TRUE ANSWER : ? YOUR ANSWER : ?
Major Histo Compatibility Complex (MHC) is a collection of genes arrayed on chromosome 6 in man, chromosome 17 in mice chromosome 21 in man, chromosome 6 in mice chromosome 17in man, chromosome 6 in mice chromosome 6 in man, chromosone 21 in mice TRUE ANSWER : ? YOUR ANSWER : ?