How do nucleotides bond within a strand

DNA helicase continues to unwind the DNA forming a structure called the replication fork, which is named for the forked appearance of the two strands of DNA as they are unzipped apart. The double-helix shape allows for DNA replication and protein synthesis to occur. As the new strands form, bases are paired together until two double-helix DNA molecules are formed from a single double-helix DNA molecule. A DNA molecule consists of two strands that wind around each other like a twisted ladder.

Each strand has a backbone made of alternating groups of sugar deoxyribose and phosphate groups. Gehring said identifying the double-helical RNA will have interesting applications for research in biological nanomaterials and supramolecular chemistry. The four bases that make up this code are adenine A , thymine T , guanine G and cytosine C. Sign in. Forgot your password? Get help. Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing.

Where are nucleotides linked 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 causes DNA to twist?

DNA is coiled into chromosomes and tightly packed in the nucleus of our cells. The nitrogenous bases that comprise the steps of the twisted staircase are held together by hydrogen bonds. What is the base pairing rule for RNA? What three parts make up a single nucleotide? There are just 3 components of nucleotide: nitrogenous base, deoxyribose sugar and phosphate group.

In DNA, complementary nitrogen bases on opposite strands are connected with hydrogen bond. This is how two DNA strands are held together. What do the letters DNA stand for? DNA stands for deoxyribonucleic acid, sometimes called "the molecule of life," as almost all organisms have their genetic material codified as DNA. Note that two pairs of bases have similar structures. A and G both have two carbon-nitrogen rings and are known as purines. In contrast, C and T have a single carbon-nitrogen ring and belong to a class of molecules called pyrimidines.

Hydrogen-bond interactions between the bases allow two strands of DNA to form the double helix. These interactions are specific: A base pairs with T, and C base pairs with G. This occurs via hydrogen bonds, which are shown with dotted lines in the figure above. If DNA were thought of as a spiral staircase, the base pairs would be the steps. This is illustrated in the figure below.