Question

answer for 20 might be wrong

Question 20 1 pts Tuberculin skin tests are positive after: active but cured disease. O primary infection but no disease. BCG vaccination. All other answers are correct Question 21 1 pts What observation would you expect to make if someone were born with a mutation in their B cells that makes the B7/CD80 protein nonfunctional? The primary antibody response would be weakened but the secondary response would work as normal O No B cells could ever become activated and proliferate in response to binding an antigen Levels of circulating IgG antibodies would be significantly lower than normal while IgM amounts would be normal O Levels of circulating IgG and IgM would be significantly higher than normal O B cells would become easier to activate, leading to an over-active immune system and more likely autoimmunity

Answer 1

20 Ans: The correct optiion is B.

Tuberculin test is conducted to check whether person is infected with TB bacteria.

Positive results indicate that person is infected with bacteria but it might not necessarily cause disease.