What genetic engineering issue is of greatest public concern?
a) it may create new varieties of food.
b) it may create new medicine.
c) it may create new opportunities for research.
d) it may create new allergies in humans.

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?