You are watching: What type of bond holds the nitrogenous bases together
A nucleotide consists of three things: A nitrogenous base, which deserve to be either adenine, guanine, cytosine, or thymine (in the instance of RNA, thymine is replaced by uracil).A five-carbon sugar, called deoxyribose because it is lacking an oxygen team on one of its carbons.One or much more phosphate groups. The nitrogen bases room pyrimidine in structure and form a bond in between their 1" nitrogen and the 1" -OH team of the deoxyribose. This type of bond is referred to as a glycosidic bond. The phosphate group develops a bond v the deoxyribose sugar v an ester bond between one the its negatively fee oxygen groups and the 5" -OH the the sugar ().
main point Acids
Nucleotides sign up with together through phosphodiester linkages in between the 5" and 3" carbon atoms to form nucleic acids. The 3" -OH that the street group forms a link with among the negatively charged oxygens of the phosphate group attached to the 5" carbon of another sugar. When plenty of of these nucleotide subunits combine, the an outcome is the big single-stranded polynucleotide or nucleic acid, DNA ()
If you look closely, you can see the the two sides that the nucleic acid strand shown above are different, causing polarity. At one end of the large molecule, the carbon team is unbound and also at the various other end, the -OH is unbound. These various ends are called the 5"- and 3"-ends, respectively.
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The Helical framework of DNA
mirrors a single strand of DNA. However, as proclaimed earlier, DNA exists as a double-helix, definition two strands of DNA tie together.
An important thing to remember around the structure of the DNA helix is that together a result of anti-parallel pairing, the nitrogen base groups challenge the within of the helix if the sugar and phosphate groups challenge outward. The sugar and phosphate groups in the helix as such make up the phosphate backbone that DNA. The backbone is extremely negatively charged as a result of the phosphate groups.