| 词汇 | cytosine |
| 释义 | BETA Examples of cytosinecytosine isn’t in the Cambridge Dictionary yet. You can help! The two additional cytosine nucleotides that constitute the bulge are highlighted in green. There are 30 adenines in conserved single-stranded positions compared with 26 thymines, 9 guanines and 5 cytosines. The point mutations at codon-46 and codon-108 represent transitional pyrimidine (thymine to cytosine) and purine (guanine to adenine) substitutions respectively. Paramutation of the r1 locus of maize is associated with increased cytosine methylation. Note the hydrogen bond between the exocyclic amine of the 3h cytosine base and the non-bridging oxygen of the phosphate at the exchange point. Spontaneous deamination of 5-methylcytosine to thymine causes a 12-fold increased mutation frequency relative to unmodified cytosine. The contribution of cytosine protonation to triplex stability. Purines and pyrimidines, including adenine, guanine, cytosine, thymine and uracil, play a major role in terrestrial biochemistry. The 3h cytosine is stacked onto the top of the non-stacked helix, while the 5h cytosine is directed upwards and is located in the minor groove of the top helix. Shapiro (1995, 1999) addressed difficulties in prebiotic syntheses of nucleo- bases adenine and cytosine. The incoming guanine now is paired with the cytosine of the original duplex and the displaced guanine is situated on the major groove side of the newly formed base pair. With widely diffused minerals and metal oxides as catalysts, formamide affords all the precursor nucleic bases: purine, adenine, hypoxanthine (bioisomer of guanine), cytosine, uracil and thymine. Cytosine methylation in gene silencing mechanisms. The product contains unconverted cytosine where they were previously methylated, but cytosine converted to uracil if they were previously unmethylated. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Hypoxanthine, in a manner analogous to the imine tautomer of adenine, selectively base pairs with cytosine instead of thymine. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The most common nitrogenous bases are adenine, cytosine, guanine, thymine, and uracil. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Methylated cytosine residues are unchanged by the treatment, whereas unmethylated ones are changed to uracil. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. During the period 1885 to 1901, he was able to isolate and name its five constituent organic compounds: adenine, cytosine, guanine, thymine, and uracil. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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