How are polynucleotide strands held together?
How are polynucleotide strands held together?
How are polynucleotide strands held together?
A DNA molecule consists of two polynucleotide strands that form a double helix. The strands are held together by hydrogen bonds between the nitrogen-containing bases. One strand is complementary to the other strand, which means that a base on one strand is paired with a base on the opposite strand.
How are the strands of DNA held together?
The two strands are held together by hydrogen bonds between pairs of bases: adenine pairs with thymine, and cytosine pairs with guanine.
Which bond holds the two polynucleotide chains of DNA?
Hydrogen bonds
The hydrogen bonding between complementary bases holds the two strands of DNA together. Hydrogen bonds are not chemical bonds. They can be easily disrupted. This permits the DNA strands to separate for transcription (copying DNA to RNA) and replication (copying DNA to DNA).
What holds polynucleotide chains together?
Nucleotides are joined together by covalent bonds between the phosphate group of one nucleotide and the third carbon atom of the pentose sugar in the next nucleotide. This produces an alternating backbone of sugar – phosphate – sugar – phosphate all along the polynucleotide chain.
What are polynucleotide strands?
A polynucleotide strand is made of a sugar-phosphate backbone (like the string in a strand of flags) and a variety of bases (like the flags), one per nucleotide. A polynucleotide is made when a polymerase enzyme joins nucleotides together. The strand has two different ends, which we call 3′ and 5′.
What types of bonds hold polynucleotide bases together?
1 Answer. Nucleotides are joined by phosphodiester bonds in a polynucleotide strand.
What are the strands of DNA called?
The two DNA strands are known as polynucleotides as they are composed of simpler monomeric units called nucleotides. Each nucleotide is composed of one of four nitrogen-containing nucleobases (cytosine [C], guanine [G], adenine [A] or thymine [T]), a sugar called deoxyribose, and a phosphate group.
What do two strands of DNA join together to form?
Each molecule of DNA is a double helix formed from two complementary strands of nucleotides held together by hydrogen bonds between G-C and A-T base pairs. Duplication of the genetic information occurs by the use of one DNA strand as a template for formation of a complementary strand.
What kind of bond holds one polynucleotide strand to its complement between strands )?
Adenine of one strand forms two hydrogen bonds with thymine of other strand and guanine forms three hydrogen bonds with cytosine. The two bases forming hydrogen bonds to joins the polynucleotide strands together are present in the same plane.
What makes up a polynucleotide?
Polynucleotides are made up of long chains of nucleotides like DNA and RNA, while polysaccharides are composed of monosaccharides joined by glycosidic linkage and polypeptides are short polymers of amino acids linked together by an amide bond.