The beaker in the illustration below contains two solutions of salt with different concentrations (measured by molarity, M). The two solutions are separated by a membrane that is permeable to both salt and water. Side A has 0.2 M of Salt and Side B has 0.9 M of salt. Which of the following will you observe after a long time has passed?
a) Net diffusion of water from A to B and of salt from B to A.
b) Net diffusion of salt across the membrane, but not of water.
c) Net diffusion of salt from B to A, but no net diffusion of water.
d) Net diffusion of water across the membrane, but not of salt.
e) Net diffusion of water from B to A and of salt from A to B.
f) No net diffusion of water or salt across the membrane
Ans: f) No net diffusion of water or salt across the membrane
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If a short sequence of DNA is 5' AATTGCCGT 3', its complement is
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During DNA replication, which enzyme assembles the new DNA strands?
a. DNA polymerase b. RNA polymerase c. DNA replicase d. DNA helicase e. DNA-RNA synthase
Which of the following is false concerning fertilization?
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A microbiologist inoculates a flask of broth to a concentration of 100 bacterial cells per ml. The generation time of the species is 1 hour, and there is no lag phase. How long will it be before the culture contains more than 6,000 cells per ml?
A) 12 hours B) 6 hours C) 2 hours D) 4 hours E) 10 hours