its structure was revealed using X-rays. And DNA turns out to be a stunningly elegant molecule. What you’re looking at is the original DNA model currently on display in the Science Museum in London. It shows two long chains of molecules...
- **A** 提到右手反平行双螺旋(11 bp/圈):B-DNA的典型特征为每圈约10个碱基对,故11 bp/turn错误。 - **B** 描述左手反平行双螺旋(~10 bp/turn):左手螺旋是Z-DNA的特征,且Z-DNA每圈碱基对数为12,此选项完全错误。 - **C** 正确。B-DNA是右手反平行双螺旋,每圈约10 bp,与题干完全匹配。 -...
Which structure is found only in eukaryotes? How is DNA packaged in the nucleus of somatic cells? Chromatin contains proteins called How does the nucleus control which proteins are made by the ribosomes? In what part of a cell would you find most of a cell's ...
Where is DNA found in a cell? What is DNA electrophoresis based on? What is type B-DNA? As DNA is replicated, which DNA base pair will bond to cytosine? How many different bases can be found in a molecule of DNA? What DNA structure was found in 1953?
Generally speaking, the fundamental DNA structure can be simply perceived as a double helical structure: two single DNA strands twisted around each other in the form of a double helix (Fig. 9.21). Single DNA strands consist of a long chain of repeating subunits, which are called nucleotides (...
which is not attached to a phosphate group. This portion of the nucleotide is typically referred to as the3' end(Figure 1). When nucleotides join together in a series, they form a structure known as apolynucleotide. At each point of juncture within a polynucleotide, the 5' end of one nu...
Transcription can also be affected by binding of transcription factors to G4 structures (for example, myosin D (MyoD)), which can then titrate transcriptional regulators away from their recognition sequences in promoters. G4 structures must be unwound to allow faithful replication of the entire ...
DNA Structure A nucleotide is the basic building block of nucleic acids (RNA and DNA). HowStuffWorks DNA is one of the nucleic acids, information-containing molecules in the cell (ribonucleic acid, or RNA, is the other nucleic acid). DNA is found in the nucleus of every human cell. Th...
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The figure displays the DNA repair pathways which can be found in organelles, but the presence or not of a given mechanism may depend on the organism considered. Abbreviations: NHEJ, non-homologous end joining; HR, homologous recombination; TCR, transcription-coupled repair; GGR, global genome ...