How did Meselson and Stahl distinguish between semiconservative and dispersive replication in their experiment?
A. After one round of replication, only mixed DNA molecules were present in native gradients.
B. After two rounds of replication, only mixed DNA molecules were present in the gradient.
C. After two rounds of replication, both heavy and light DNA molecules were present in the gradient.
D. After one round of replication, both heavy and light DNA single-strands were present in alkaline gradients.
E. After two rounds of replication, only heavy DNA strands were present in alkaline gradients.
D
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Using your knowledge of the age of lithospheric crusts and biogenous sediment accumulation, explain why it would be fruitless, not to mention expensive, to excavate for oil far off the coast, beyond the continental shelf
What will be an ideal response?
Why can cholesterol act as a “fluidity buffer” in cell membranes?
a. It is slightly amphipathic because of the presence of one hydroxyl group. b. It is slightly hydrophobic because of the presence of one hydroxyl group. c. It is slightly hydrophobic because of the presence of one carboxyl group. d. It is slightly amphipathic because of the presence of one carboxyl group. e. It is slightly hydrophilic because of the presence of one hydrocarbon group.
Which gene product would be most useful for distinguishing between a microsporidian and a blastocladiomycete?
A. Chitin B. DNA polymerase C. ATP synthase D. Phospholipidase E. Rubisco
Please choose the correct statement comparing Bacillus cereus to Clostridium perfringens.
A) Both bacterial infections are mediated by ingested endospores B) Similar foods can be the carrier material for the endospores of both organisms. C) The symptoms of the two diseases are similar. D) All of these choices are correct. E) Both bacteria are gram-positive rods.