Unformatted text preview: ture: random coil.
There is flexibility of rotation of residues
and no specific structure.
• Stacked-base structure: adapted by non–
self-complementary single strands under
“native” conditions. Bases stack to pull the
chain into a helix, but there is little Hbonding.
• Hairpin structures: formed by selfcomplementary sequences; the chain folds
back on itself to make a stem–loop
structure. Plasticity of Nucleic Acids
complementarity in a base sequence allows a chain to fold back on itself and form a base
paired, anDparallel helix or hairpin structure • Double hairpins, ojen called cruciform (cross
like) structures, can form in some DNA/RNA sequences. •
• To form this structure, the sequence must be palindromic. Self
complementarity dictates the ter.ary structure of tRNA. Plasticity of Secondary and
Tertiary DNA Structure Structures of DNA! Triplex G
Quadruplex Structures of DNA! Holliday Junc.on RNA Structure • RNA molecules are usually single
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