Biology, 24.03.2020 19:15, brapmaster764
Why is a cap added to mRNA, but not to tRNA or rRNA? Transfer RNA and rRNA exhibit complex structures with double stranded regions. The three-dimensional shapes of these molecules keep the 5' end of the RNA away from the enzymes that process the cap. RNA polymerase II transcribes mRNA, whereas RNA polymerase I transcribes rRNA, and RNA polymerase III transcribes tRNA. The domain that assists other enzymes in adding the cap is found in RNA polymerase II only. Messenger RNA is transcribed and processed in the nucleus, where it can interact with the cap binding proteins that transfer the cap to the 5' end. Transfer RNA and rRNA are transcribed and processed in the cytoplasm and do not encounter capping enzymes. Only mRNA contains introns. Capping occurs simultaneously with intron removal because the same enzymes and proteins involved in both of these processes must bind to RNA at the same time.
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Biology, 22.06.2019 08:40, Josephzaz
Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of
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Biology, 22.06.2019 10:30, jagslovegirl
Natural selection changes allele frequencies because some survive and reproduce more successfully than others.
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Biology, 22.06.2019 20:00, yasdallasj
Which does not describe a physical change happening to water? water evaporating in the sun water reacting with nitrogen gas water freezing and being broken apart with a knife water heating up on a stove
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Why is a cap added to mRNA, but not to tRNA or rRNA? Transfer RNA and rRNA exhibit complex structure...
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