usabo semis '17 test import with correct answers

[WARNING: INVALID] 1. What does this experiment tell us? Choose ALL that apply. A. Both B cells and T cells can produce antibodies. B. Both B cells and T cells have memory functions. C. Both B cells and T cells are required for an antibody response. D. B cells are required for an antibody response in the absence of T cells. E. B cells and T cells are co-localized and produce synergetic effects in bone marrow and thymus. correct answersanswer: c type: x 2. In 2090, a human population is found that is resistant to HIV. To examine what conferred such an evolutionary advantage on this population, specifically HIV entry, the clinically healthy mutations below were examined. To produce this advantage, which of the following would have to become dysfunctional? A. CD8 receptor. B. Chemokine co-receptor of the host cell. C. MHC II molecule. D. Reverse transcriptase. E. Unique histone marker from HIV. 2017 USABO Open Exam Page 1 correct answersanswer: b 3. Which of the following statements is NOT true of multiple sclerosis (MS)? A. Loss of myelin is a prominent component of MS pathology. B. Loss of oligodendrocytes is a prominent component of MS pathology. C. MS is caused by a collection of genetic and environmental