Biology, 19.02.2021 21:00 lopez5628

What hypothesis explains why all birds share similar characteristics?

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Biology, 22.06.2019 02:40, 02s54mcoupe

What advantage does a crop that undergoes vegetative reproduction have over plants that start from the seed? 1points a they store nutrients. b they can travel farther. c they experience more genetic variation. d they only occur in high-resource environments.

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Biology, 22.06.2019 02:50, mccay5016987

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?

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Biology, 22.06.2019 13:00, shan8747

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.

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Biology, 22.06.2019 15:50, jenny3661

Polar zones are cold and tend to be dry because of a pressure system of cold. low high