| HhH | Helix-hairpin-Helix |
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| ribozyme | <molecular biology> Often referred to as RNA with catalytic capacity, an enzyme made of nucleic acid not protein that catalyse chemical reactions, often the breakdown of other RNAs. Of particular interest because of the implications for self replicating systems in the earliest stages of the evolution of (terrestrial) life. Their discovery in the mid-1980s refuted the concept that only proteins could be biological catalysts. There is potential for their use as pharmaceuticals and industrial catalysts. (13 Nov 1997) |
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| hairpin | The structure formed by a polynucleic acid by base-pairing between neighboring complementary sequences of a single strand of either DNA or RNA. (05 Mar 2000) |
| hairpin loop | An area where single-stranded DNA or RNA has folded back on itself and nucleotides from the two separate segments have base paired, so that the resulting structure appears as the name describes. (09 Oct 1997) |
| hairpin loops | Single-stranded DNA and RNA can fold back on itself under the proper conditions forming irregular double-helical loops. (05 Mar 2000) |
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