Biology, 21.01.2020 23:31 Dericktopsom
Biological classifications have changed over the years. what is probably not a reason for these changes?
scientists change the names of taxonomic groups to match current nomenclature.
scientists learn more about the genetic sequences of organisms, and thus how they are related.
scientists learn more about the evolutionary histories of organisms through the fossil record.
new species are discovered that challenge old classifications.
Answers: 2
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
Biology, 22.06.2019 08:20
Which characteristics are typical of a human population in the postindustrial stage?
Answers: 3
Biology, 22.06.2019 10:00
In what part of the body does the most muscle activity happen?
Answers: 1
Biology, 22.06.2019 11:30
Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.
Answers: 1
Biological classifications have changed over the years. what is probably not a reason for these chan...
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