Biology, 17.07.2019 23:30 coolcat3190
How do scientists know that dark matter exists? a. it absorbs radio waves. b. it emits electromagnetic radiation. c. it exerts a gravitational pull on other matter. d. it blocks the light coming from other objects.
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Biology, 21.06.2019 17:40
What links the two strands in a dna helix together in the middle? a. phosphate groups b. sugar rings bonded together c. proteins d. bases with hydrogen bonds
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Biology, 21.06.2019 18:50
Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide
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Biology, 21.06.2019 20:10
Which process can increase the rate of greenhouse gas emissions into the atmosphere in response to a decrease in albedo
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Biology, 22.06.2019 02:50
Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?
Answers: 1
How do scientists know that dark matter exists? a. it absorbs radio waves. b. it emits electromagne...
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