Biology 1201A Lecture Notes - Lecture 4: Prokaryote, Prophage, Provirus
21 Nov 2016
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Mobile elements: a particular segment of dna, that can move from one place to another; they cut and paste sections of dna using a type of recombination that does not necessarily require homology. Insertion sequence elements and transposons are the two major types of prokaryotic mobile elements. Mobile elements are also known by the more specific term transposable elements (tes), and their mechanism of movement, involving nonhomologous recombination is called transposition. The two major types of bacterial tes are insertion sequences (iss) and transposons. At each of the two ends of an is is a short inverted repeat sequence the same dna sequence running in opposite directions. The inverted repeat sequences enable the transposase enzyme to identify the ends of the te when it catalyzes transposition. The second type of bacterial te, called a transposon, has an inverted repeat sequence at each end enclosing a central region with one or more genes. 9. 4b: transposable elements were first discovered in eukaryotes:
