1. The redwood trees in California are among the tallest trees known. If the height of a redwood was 105 m, estimate the osmotic pressure required to push water up from the roots to the treetop. Assume the roots function as a semi-permeable membrane.

(A) 1.02 atm

(B) 4.2 attn

(c) 10.2 atm

(D) 42 atm

(E) 102 attn

2. The diffusion coefficient of a protein in a buffered solution at 20°C was measured using a concentration gradient between two reservoirs with concentrations of 100 gM and 1 gM respectively. The two reservoirs were separated by a 1 mm thick porous glass disk with a 4.2 cm² effective area. About 0.1 pmols of the protein were detected to be crossing the disk per hour. What is the diffusion coefficient D of the protein?

(A) 9.4x 10^-6 cm² s^-1

(B) 8.0x 10^-6 cm² s^-1

(C) 4.0 x 10^-7cm² s^-1

(D) 4.2 x 10^-6 cm² s^-1

(e) 6.7 x 10^-6 cm² s^-1