MBB 222 Study Guide - Final Guide: Pseudouridine, Transfer Rna, Escherichia Coli

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Base-pairing within single-stranded rna, forming segments of duplex (self- complementary sequences) Sequences may give structural variation that could affect the function and metabolism of the dna segments. 4+ adenosine residues give bends in the dna helix. Palindrome = word/phrase/sentence that is spelled identically regardless if it is read forward or backwards. This is applied to regions of dna with inverted repeats of base sequences having twofold symmetry. Palindromic sequences are self-complementary within each strand and as a result can form hairpin or cruciform structures. When both strands of a duplex dna are involved, it is called a cruciform. Hairpin: alternative structure that is formed from palindromic dna/rna sequences when only a single strand is involved. Bending in the helix possibly due to the sequence-dependence of structure (such as 4+ adenosine residues) U5-03 first triplex vs. tetraplex / quadruplex. Triplex dnas are 3 dna strands joined together, either 2 pyrimidine and 1 purine or 2 purines and 1 pyrimidine.

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