Two newly prepared solutions, A and B, contain a red dye. Solution A is darker in color than solution B. We will make two experimental observations: Experiment 1: A and B are placed, side-by-side, separated by a semipermeable membrane through which only water can pass. Experiment 2: A and B are placed, side-by-side, separated by a plastic sheet with pin holes. What will happen if we carefully measure the color intensity of solution B after an hour or two

The intensity of solution B will increase in experiment 1

But it will remains constant in experiment 2

Explanation:

Experiment 1 - When solution A and solution B are separated by a semipermeable membrane, only water can flow from region of higher concentration to the region of lower concentration. Since, solution B is lighter in color than the solution A, the number of colorings solute particle is higher in solution A. This also suggests that the water concentration is higher in solution B. Thus, water will move from solution B to solution A thereby making it darker in color

Experiment 2 –  

Pin holes are created but the movement of solute and solvent is only possible if there is difference in quantity of both the solutions. Holes in plastic sheet has nothing to do with the  concentration of solute or solvent.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."