In the Meselson-Stahl experiment, bacterial DNA was labeled completely with heavy nitrogen (N-15)
and then grown in the presence of light nitrogen (N-14). When only mixed DNA was observed after
ONE generation of growth in N-14, what was the conclusion?
a. DNA replication is semiconservative
b. DNA replication is conservative
c. DNA replication is dispersive
d. DNA replication is either semiconservative or dispersive
e. DNA replication is either semiconservative or conservative
D
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Which of the following is one of the properties of life?
a. membrane-bound organelles b. serendipity c. growth and development d. movement
A problem with corals associated with warming of the oceans is called:
a. white pox disease. b. coral bleaching. c. black band disease. d. yellow-blotch disease. e. green band disease.
The mode of action of Ecstasy is to
a. cause overstimulation of target cells in the brain. b. interfere with release of neurotransmitters in the brain. c. decreases the amount of serotonin in the brain. d. speed up clearance of serotonin in the brain. e. is used clinically to treat anxiety.
Each ________ on the hemoglobin subunit is capable of binding an oxygen molecule, thereby allowing ________ oxygen to bind with one hemoglobin molecule.
A) globin : four B) heme : four C) globin : three D) heme : three E) free iron : one