The figure below shows the primary and secondary immune responses to an antigen. Which of the following is NOT shown or implied by this figure? Antibody titer in serum (arbitrary units)- 1st Ag Exposure IgM IgG 14 Time (days) 2nd Ag Exposure 21 58 65 None of the other four answers (All are shown or implied by the figure) IgG is the predominant class of antibody produced after second exposure to the Ag The second exposure to an Ag results in higher lgG levels than the first exposure IgM is the first class of antibody produced after first exposure to the Ag Memory B cells produced upon the first exposure to an Ag can react quickly to subsequent exposures to the same Ag 72

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Defense Mechanism

Circumstances influence and compel people to behave in a certain way. One such behavior is a defense mechanism. It is employed by people to escape from unpleasant circumstances, thoughts and actions. Defense mechanisms are, thus, psychological strategies that help to avert and avoid unwanted feelings such as guilt or shame and situations such as threat and danger.