Problem: Brad and Henry were two old friends in their 70's. Brad had very high levels of cholesterol, while Henry was healthier and had normal levels of cholesterol. Which friend takes a drug that induces the expression of low density lipoprotein (LDL) receptors in the liver?

A: Brad

Problem: Recently a large amount of factories have been built in Illinois using fossil fuels as their main energy source. In Indiana however, many of their factories have been shut down and replaced by parks with many plants and trees. Given Illinois adds even more of these fossil fuel burning factories will the levels of carbon dioxide increase or decrease?

A: increase

Problem: Dan studied multicellular organisms that presented mutations. Group A presented gemline mutations, while group B presented somatic mutations. He was fascinated by these organisms. Which group had fewer organisms having mutations in the DNA of sex cells?

A: group B

Problem: Mary and Ben went in for a blood test. Ben had high cholesterol, so the Doctor recommended him to lower it. Mary had normal cholesterol levels. Which person was at lower risk of heart attack?

A:
Mary