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The two chains of nucleotides in a DNA molecule are held together by hydrogen bonds between the bases. In DNA, cytosine forms three hydrogen bonds with guanine, and thymine forms two hydrogen bonds with adenine.

If you have a Biology textbook, you will find this answer in the caption on the bottom of page 284.

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Related Questions

Which enzyme is responsible for facilitating the hydrogen bonding between nucleotides in a new molecule?

the DNA polymerase III


What organic substance is made up of nucleotides?

DNA and RNA are organic substances that are composed of nucleotides. A nucleotide contains a sugar, a phosphate group, and an organic base.


Which nucleotides would be found in the molecule?

Without knowing what molecule and which nucleotides, it is impossible to answer your question.


What is any molecule that contains hydrogen and carbon?

Any molecule that contains hydrogen and carbon is an organic compound. If the molecule contains no other elements, it is also a hydrocarbon.


What holdes the two strands of a DNA molecule to each other?

Hydrogen bonds


What is the unique pairing pattern between nucleotides?

Within the Dna double helix molecule Adenosine hydrogen binds only with Thymine while Cytosine hydrogen binds only with Guanine.


What pair forms a rung in the DNA ladder?

The base of the nucleotides


Four subunits are needed to make a DNA molecule.?

Nucleotides Four nucleotides are needed to make a DNA molecule.


An example of a molecule?

A molecule of water, a molecule of hydrogen, a molecule of oxygen, a molecule of sugar... Actually more substances come in form of molecules than in atomic form.


The mRNA molecule is completed by the formation of what between the rna?

The mRNA molecule is completed by the formation of phosphodiester bonds between the RNA nucleotides during the process of transcription. This results in a single-stranded molecule that carries the genetic information from DNA to the ribosome for protein synthesis.


A molecule made of linked nucleotides?

Ribonucleic acid


What joins sugars to phosphate groups in nucleotides?

In nucleotides, sugars are joined to phosphate groups by phosphodiester bonds. This bond is formed between the 5' carbon of one sugar molecule and the 3' carbon of another sugar molecule, creating a sugar-phosphate backbone in DNA and RNA strands.