| The antigen-antibody immunological
reaction used to be regarded as typical of immunological responses. Antibodies
are proteins synthesized by specialized cells called plasma cells, which are
funned by lymphocytes (cells from the lymph system} when an antigen, a substance
foreign to the organism’s body, comes in contact with lymphocytes. Two important
manifestations of antigen- antibody immunity are lysis, the rapid physical
rupture of antigenic cells and the liberation of their contents into the
surrounding medium, and phagocytosis, a process in which antigenic particles are
engulfed by and very often digested by macrophages and polymorphs. The process
of lysis is executed by a complex and unstable blood constituent known as
complement, which will not work unless it is activated by a specific antibody;
the process of pbagocytosis is greatly facilitat A. proteins existed in specific group types B. proteins could have been shown to direct the synthesis of other proteins C. antigens were always destroyed by proteins D. antibodies were composed only of protein [单项选择]
Dogs are constantly learning from the reaction of human owners, picking up facial cues and anticipating their owner’s behavior, a new research suggests. The findings, published online in the journal Learning and Behavior, show that dogs essentially are always in training, and help explain how many owners unknowingly teach and reward their dog’s bad behavior. [单项选择]The antigen-antibody immunological reaction used to be regarded as typical of immunological responses. Antibodies are proteins synthesized by specialized cells called plasma cells, which are funned by lymphocytes (cells from the lymph system when an antigen, a substance foreign to the organism’s body, comes in contact with lymphocytes. Two important manifestations of antigen- antibody immunity are lysis, the rapid physical rupture of antigenic cells and the liberation of their contents into the surrounding medium, and phagocytosis, a process in which antigenic particles are engulfed by and very often digested by macrophages and polymorphs. The process of lysis is executed by a complex and unstable blood constituent known as complement, which will not work unless it is activated by a specific antibody; the process of pbagocytosis is greatly facilitated when the particles to be engulfed are coated by a specific antibody directed against them.
The reluctance to abandon this hypothesi A. is wrong B. was accepted without evidence C. is unverifiable D. is a partial explanation 我来回答: 提交
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