When Darwin covered the tip of a grass seedling with metal foil and then illuminated it from one side, what happened to the seedling?
A. It did not respond to the directional light.
B. It waved back and forth.
C. It wilted and died.
D. It bent away from the directional light.
E. It grew toward the light, as expected.
Answer: A
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Which one of the following statements about the methylation state of CpG islands is incorrect?
A. Cells can heavily methylate CpG islands of viral DNA sequences in order to restrict their expression. B. Cancer cells often methylate CpG islands in genes that could restrict cell growth. C. The methylation state of CpG islands provides a way to turn genes on or off. D. The methylation state of CpG islands is rigid and will not change over time. E. The methylation state of CpG islands can change in response to the environment.
Explain the reasoning behind the laws in some European countries that limit the number of children that can result from a single sperm donor. Do you agree with these restrictions? Why or why not?
What will be an ideal response?
IN SEX REPRODUCTION, GENETIC VARIATION IS ACCOMPLISHED BY ALL EXCEPT?
What will be an ideal response?
All cnidarians share the ability to do which of the following?
A. photosynthesize B. secrete enzymes to digest food C. sting predators and prey D. live on land E. fly