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You sample a population of Salmonella typhimurium from a popular local hamburger joint Howdyburger. You find 9 isolates (clones) that are resistant to the antibiotics ampicillin and kanamycin, 32 isolates that are resistant to amipicillin but susceptible to kanamycin, and 51 isolates that are susceptible to both antibiotics. What is […]

Q1. A sixty eight year old Caucasian man was diagnosed with B cell chronic lymphocytic leukaemia (B-CLL) and received various regimens of chemotherapy. As a patient with chronic leukaemia he attended the CLL clinic frequently. Ten years later patient presented with pneumonia symptoms and was examined by chest CT scan. […]

Teenage pregnancy is a phenomenon threatening the health of young women and our society. Young teenagers are less likely to have a healthy baby than women in their 20s. Teenage mothers are also much less likely to have the material means to provide for their children. Low self-esteem is often […]

Q1. A scientist randomly separated a group of 100 lab rats into two groups of 50. One group was fed regular rat chow while the other was fed the same quantity of rat chow with added ddt. Both groups were housed in the same room with the same environmental conditions. […]