Two medical school students named Dan and Bob learned about the human immune system. Dan studied more about the subject, and became very interested to pursue it more in the future. Which student didn't learn that the infected skin area may become red?
Ans: Bob

Two climate experts studied different continent to observe climate changes. Jordan studied Australia, while Jeb studied Antarctica. Which person didn't observe warming in spring?
Ans: Jordan

Two colleagues gave blood for an emergency. Ned got infected with HIV because they re-used a needle. His friend Nate was not infected. Which colleague had a virus that originated in sub-Saharan Africa?
Ans: Ned

John is trying to figure out how substance passes through the cell membrane. He noticed two different cases, case A and case B. In case A active transport is involved, but in case B diffusion is involved. He needs to do further study to learn about the details of these processes. In case A, would the substance move towards less or more concentrated area than in case B?
Ans: more