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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
Practitioners of homeopathic medicine believe that toxic substances, appropriately diluted, can have healing effects, usually having the opposite effect of symptoms of the original toxic compound.
In plants three genes exhibit simple dominant recessive inheritance for R black stem red stem; tall (D) and dwarf(d); and full pods (C) or constricted pods (c ) In a cross of RrDdcc X Rr dd Cc what percentage of progeny are RRdd cc ?
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