Hydrogen bonds hold the DNA bases together. There are three bonds between Guanine and Cytosine, and two bonds between Adenine and Thymine.
covalent bond
Covalent Bond
hydrogen bonds
polar covalent bond
Hydrogen bonding holds together the two strands of a double stranded DNA. Hydrogen bonding exists between the nitrogen base pairs.
The nitrogen bases are held together by hydrogen bonds.
glycosidic bonds
Metallic bond
Covalent Bond
covalent bond
Covalent Bond .
Covalent bond.
The bond in water is covalent.
an ionic bond
In sodium metal the atoms are held together by metallic bonds.
These are metal bonds.
hydrogen bonds