Question

1. look at the graph below. who got sick 1st, 2nd, 3rd, 4th, 5th. explain how you know for all 5. second exposure to antigen the five guys below are best buds. all of a sudden the guys started getting sick one by one. after 15 days, an elisa test is performed on antibodies for each of their body serums. first exposure to antigen antibody (to a) concentration (arbitrary units) 10⁴ 10³ 10² 10¹ 10⁰ 0 7 14 21 28 35 42 49 56 time (days) steve john michael mic terry

Explanation:

Step1: Understand antibody - response principle

The earlier a person is exposed to an antigen (gets sick), the more time their body has to produce antibodies. After 15 days, an ELISA test is done for antibodies. Higher antibody levels suggest earlier exposure.

Step2: Analyze bar - chart values

Steve has the highest antibody concentration in his serum among the five. So he was likely exposed first. John has the second - highest level, so he was likely second. Michael has the third - highest, so third. Mic has the fourth - highest, so fourth. Terry has the lowest (or no detectable level in the blank bar), so he was likely the last to be exposed.

Answer:

1st: Steve
2nd: John
3rd: Michael
4th: Mic
5th: Terry