The experiments of Hershey and Chase
1.used radioactive phosphorus to label DNA and radioactive sulfur to label proteins.
2.used radioactive sulfur to label DNA and radioactive phosphorus to label proteins.
3.used mice.
4.demonstrated the transforming principle.
5.showed that protein entered the bacterial cells.
1
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A virus consisting of a single strand of RNA, which is transcribed into complementary DNA, is a _____
A) reverse transcriptase B) protease C) retrovirus D) RNA replicase virus E) nonenveloped virus
Imagine that several thousand years ago, a group of bats and a group of frogs colonized an island at the same time. What can you expect of their current descendants?
A. There will be more frog species compared to bat species. B. There will be more bat species compared to frog species. C. The number of bat and frog species will be equal. D. All frog species will have become extinct on the island. E. All bat species will have become extinct on the island.
The equation, 6CO2 + 6H2O ?C6H12O6 + 6O2, describes which of the following processes?
A. photosynthesis B. Calvin cycle C. light reaction D. nitrogen fixation E. aerobic respiration
The primary function of molecular membranes is the transport of ions and molecules in and out of cells. The movement of molecules from areas of low concentration to those of high concentration against chemical gradients is best described as:
A) passive transport. B) osmosis. C) active transport. D) channel-mediated diffusion. E) electron transport.