A child stung by a bee experiences respiratory distress within minutes and lapses into unconsciousness. This reaction is probably mediated by() A: IgE antibody B: IgG antibody C: sensitized T cells D: complement E: IgM antibody

名词解释:抗体 (Antibody,Ab)

基因工程抗体（genetic engineering antibody）

The basic principle of radioimmunoassay is A: The radiolabeled antigen reacted with excessive specific antibody B: The radiolabeled antigen reacted with a limited number of specific antibodies C: Radiolabeled antigen and unlabeled antigen reacted competitively with limited amount of specific antibody D: Radiolabeled antigen and unlabeled antigen reacted with excessive specific antibody

An antibody is Y-shaped and has __ identical antigen-binding sites, one on each arm of the Y.

PCR is used to detect ( ) A: Antigen B: Antibody C: DNA or RNA D: Complement

The type of blood is decided by ____.() A: The<br/>type of receptor on RBC membrane B: The<br/>type of antigen on RBC membrane C: The<br/>type of antibody on RBC membrane D: The<br/>type of antigen in plasma E: The<br/>type of antibody in plasma

The<br/>ELISA can be used to detect() A: Hormones B: Enzymes C: Drugs D: Antibody

Each antibody binds to a particular target molecule extremely tightly, either inactivating the target directly or marking it for destruction. An antibody recognizes its target molecule— called an ________—with remarkable specificity, and, because there are potentially billions of different antigens that a person might encounter, we have to be able to produce billions of different antibodies.

Communication between cells is mediated by cell signaling molecules and ( ). A: Cell receptor B: Antibody C: Enzyme D: Electric signal