2014年12月12日 · DNA and RNA use a ribose sugar as a main element of their chemical structures, ribose sugar used in DNA is deoxyribose, While RNA uses unmodified ribose sugar. Ribose and Deoxyribose From the fig above we can see that the principal difference between the two molecules is the presence of OH in ribose (2' tail) and absence in deoxyribose.

2014年2月16日 · In any nucleic acid, RNA or DNA 3' refers to the 3rd carbon of sugar ribose or deoxyribose which is linked to OH group and 5' linked to a triple phosphate group. So these 5' and 3' group provide a directional polarity to the DNA or RNA molecule. Now a good question would be y 3' and 5' not 3 and 5.

2017年1月1日 · Therefore there is no variation allowed in the phosphate groups (since there's only one and they bond to other nucleotides, in the same way, every time (in nucleic acids)), furthermore in the pentose sugar the only variation allowed is whether it is a ribose (in RNA) or a deoxyribose (in DNA). So the phosphate-sugar backbone of the DNA strands ...

2020年10月27日 · (Deoxy)Ribose is found in the backbone of DNA and RNA. So, we eat ribose as part of the nucleic acid found in plant and animal foods. While protein, lipid, and sugar content is well analyzed for many staples we consume, I cannot find any numbers on ribose or DNA/RNA.

2016年3月12日 · An important structural feature of RNA that distinguishes it from DNA is the presence of a hydroxyl group at the 2' position of the ribose sugar. The presence of this functional group causes the helix to adopt the A-form geometry rather than the B-form most commonly observed in DNA.

2015年10月9日 · $\begingroup$ Because the ribose in RNA is a component of a nucleotide and is not a molecule unto itself. It has the 5' phosphates and 1' nitrogenous bases attached, and those functional groups will alter the conformation of the ribose in the nucleotide. $\endgroup$ –

Each nucleotide contains one phosphoester bond (between a phosphate O and sugar 5'-C). Additionally, two nucleotides are connected by one phosphoester bond (between a phosphate O and sugar 3'-C). So in a polymer of multiple nucleotides (DNA, RNA), the repeating monomer unit contains two phosphoester bonds, on "top" (5') and "below" (3') the sugar.

Again, sugar conformation determines the shape of the helix: for DNA helix it's usually B-form, whereas helical RNA forms A-geometry under nearly all conditions. In RNA helix we find the ribose predominantly in the C3’- endo conformation, as 2'-OH stericly disfavors the C2'-endo conformaion, necessary for B-form geometry.

2014年12月11日 · The name is derived from the sugar which is bound to the base. For RNA it is Ribose (that why it is called ribonucleic acid) and for DNA it is Deoxyribose (hence the name deoxynucleic acid). The deoxyribose is missing an OH-group at positition 2 of the sugar ring, the name literally means "without oxygen".

2015年2月24日 · I know, for instance, that RNA is much more succetible to alkaline hydrolysis than DNA and this difference is determined by the presence of 2'-hydroxyl group in ribose. I have also heard that "DNA is more stable" and thus was selected as …