A balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. Which of the following is TRUE?
A) The solution in the beaker is hypertonic relative to the solution in the balloon.
B) The solution in the balloon is isotonic; the solution in the beaker is hypertonic.
C) The solution in the balloon is hypotonic relative to the solution in the beaker.
D) The solution in the balloon is hypertonic relative to the solution in the beaker.
D
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Which of the following damaged templates encountered by a replication fork is repaired by double-strand break repair?
A. The replication fork encounters a lesion and translesion synthesis occurs. B. The replication fork encounters a lesion and stalls. C. The replication fork encounters a lesion and bypasses it, restarting synthesis on the other side of the lesion. D. The replication fork encounters a lesion at which repair has been initiated and the fork collapses. E. The replication fork encounters heteroduplex DNA.
The North American bison was hunted to near extinction in the 1800s, and has since recovered, but with decreased genetic diversity. This is an example of
A. gene flow. B. increased mutation rate. C. a bottleneck effect. D. natural selection. E. a founder effect.
What does the accompanying figure represent?
a. an acid and a base b. two different ions c. a cation and an anion d. two different elements e. two isotopes of the same element
The cilia in the trachea and bronchi __________.
a. sweep mucus containing trapped particles up and out of the respiratory tract b. move air into and out of the lungs c. increase the surface area for gas exchange d. vibrate when air rushes past them to produce sounds e. All of the listed responses are correct.