Complementary nitrogen bases pair by means of hydrogen bonds. Refer to the related link below for an illustration.
They hook up with the nitrogen base they belong with.
HYDROGEN bonds hold nitrogeneous bases together
the bases that bond together are cytosine-> guanine
adenine-> thymine
The nitrogenous bases are bonded together by hydrogen bonds.
Guanine bonds always to cytosine.
Adenine always bonds to thymine.
Adenine pairs with thymine, and cytosine pairs with guanine.
Adenine pairs with Thymine. Guanine pairs with Cytosine
covalent bonding
covalent
A molecule can have a completely nonpolar covalent bond when two atoms of the same element form the bond.
Polar covalent bond
Hydrogen bonds hold the nitrogenous base pairs together.
nitrogenous bases
A hydrogen bond--two between A and T and three between G and C.
The two chains are connected by hydrogen bonding between nitrogen bases to form a long double-stranded molecule.So hydrogen bonding determines which nitrogen bases form pairs of DNA.
across the nitrogenous bases, they form between the complementary base pairs Thymine and Adenine and also cytosine and guanine
h20 does not form a bond
Hydrogen bonds that form between the nitrogenous bases hold the double helix together.
covalent bonding
In a DNA molecule cytosine always pairs with guanine, the same is true for an RNA molecule.
covalent
As far as I know, the polar sugar-phosphate backbones of each strand form the helical scaffold, with the nitrogenous bases in the interior of the molecule, their planes nearly perpendicular to the helical axis. However, I cannot sure that it always does. I am curious that there are some exceptional cases.
two atoms that bond with a oxygen atom to form a water molecule
A molecule can have a completely nonpolar covalent bond when two atoms of the same element form the bond.