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Chapter 1
Chapter 1

... – True nucleus enclosed by a nuclear membrane – Nucleosome which consists of a strand of DNA wrapped around a disk of histone proteins – DNA appears like beads on a string • String of beads then coils into a larger structure called the 30 nm fiber • With additional proteins next coiled in to a 200 n ...
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book ppt - Castle High School
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... Circular DNA without end, when replication: open DNA → unwinding DNA → torsional (扭 力) stress → winding (纏繞) → formed super-coil (超螺旋) Topoisomerase I (bacterial and eukaryotic cell has) → bind to DNA → breaks a phosphodiester bond in one strands DNA formed nick → loss supercoiled → ligates the two ...
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Transformation of the bacterium E. coli using a gene for green
Transformation of the bacterium E. coli using a gene for green

... In molecular biology, transformation refers to a form of genetic exchange in which the genetic material carried by an individual cell is altered by incorporation of foreign (exogenous) DNA. This foreign DNA may be derived from unrelated species and even other kingdoms, such as bacteria, fungi, plant ...
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DNA supercoil



DNA supercoiling refers to the over- or under-winding of a DNA strand, and is an expression of the strain on that strand. Supercoiling is important in a number of biological processes, such as compacting DNA. Additionally, certain enzymes such as topoisomerases are able to change DNA topology to facilitate functions such as DNA replication or transcription. Mathematical expressions are used to describe supercoiling by comparing different coiled states to relaxed B-form DNA.As a general rule, the DNA of most organisms is negatively supercoiled.
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