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 bent away from the directional light.
B. It did not respond to the directional light.
C. It grew toward the light, as expected.
D. It waved back and forth.
E. It wilted and died.
B. It did not respond to the directional light.
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The reverse transcription of HIV RNA utilizes host cell tRNA as a primer. Specifically, a tRNA for lysine is utilized. Would a drug that blocked the host cell synthesis of the tRNA for lysine be a good drug to prevent the HIV life cycle?
A. Yes, it should stop the reverse transcription of the HIV genome with few side effects. B. No, the virus would just use a different tRNA for priming. C. No, this would likely kill the cells that were drug treated, because they couldn't appropriately incorporate lysine into their proteins D. No, the priming function of the tRNA is not essential for the HIV life cycle.
The RNA molecule involved in both transcription and translation is _____________. Fill in the blank(s) with the appropriate word(s)
The highest diversity of plant and animal life occurs in
A) tropical savannas. B) tropical rain forests. C) temperate deciduous forests. D) boreal forests.
By themselves, soaps have only degerming activity, not antimicrobial activity
Indicate whether the statement is true or false