Biology

Biology, 15.07.2019 02:30, sval

Which happens first when a dna double helix is formed?

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Biology, 29.08.2019 03:30, Pfaith8617

Place the order of events in chromosome packaging from beginning to end.a. sister chromatids, dna double helix, chromatin, nucleosomeb. dna double helix, nucleosome, sister chromatids, chromatinc. dna double helix, chromatin, nucleosomes, sister chromatidsd. chromatin, nucleosomes, dna double helix, sister chromatids

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Biology, 30.08.2019 22:30, Jacobstoltzfus

Since its discovery in 1953, the double helix structure of dna is now one of the most recognizable molecules in biology. what was so groundbreaking about the "double" part of the double helix molecule?

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Biology, 07.10.2019 18:30, DraeDrae138

The initiation of transcription requires melting of the dna double helix, i.e. separating hydrogen-bonded base pairs, immediately upstream of the +1 site. how is this melting accomplished in e. coli? a. bases at the promoter region flip outward from the double helix into pockets on the polymerase. b. dna helicase first unwinds the double helix around the +1 site. c. rna polymerase gets the energy to cause separation of strands from atp hydrolysis. d. topoisomerase first returns the linking number to lk0. dnaa: atp complexes bind to and twist the double helix at the +1 site.

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Biology, 30.10.2019 07:31, naiajNan

Why do complementary nucleotides across the double-stranded dna bond together using hydrogen bonds rather than covalent bonds? a) covalent bonds would be too strong to allow the double helix to easily separate and make templates available for replication and transcription. b) covalent bonds are energetically too expensive to produce. c) covalent bonds would not allow bases to pair according to chargaff's rules. d) covalent bonding across the double helix would make the dna less stable than hydrogen bonding across the double helix. e) there are no enzymes that are capable of forming covalent bonds across the double helix.

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