Adenine pairs with Thymine
Guanine pairs with Cytosine
base pairs are joined together by hydroen bonds
I believe it is called a Helix bond. I would check with someone else to makemsure though.
Hydrogen bonds.
Hydrogen bonds
hydrogen bonds
Covalent
When two atoms share electrons, the shared pair of electrons form a chemical bond called a covalent bond.
Complementary base pair
Covalent [the sharing of a pair of electrons] bond energy.
Thymine can only pair with adenine and guanine can only pair with cytosine due to the base-pairing rule.
Guanine-Cytosine and Adenine-Thymine
The nitrogen bases are held together by hydrogen bonds.
The two atoms share their electrons - so it is a covalent bond ie a shared pair.
Guanine and cytosine base pair (triple bond), and adenine and uracil base pair (double bond).
When two atoms share electrons, the shared pair of electrons form a chemical bond called a covalent bond.
Complementary base pair
The Lewis Theory describes a base as a compound that donates an electron pair. By donating the electron pair there is a covalent bond.
The backbone of the nucleotides are composed of repeating ribose (in RNA) or deoxyribose (in DNA) and phosphates held together by phosphodiester bonds between the 5's and 3's of the ribose/deoxyribose.
I think you mean a covalent bond. It is a shared pair of electrons which joins atoms together.
Covalent [the sharing of a pair of electrons] bond energy.
The Adenine (Thymine) base pair is held together by 2 hydrogen bonds while the Guanine (Cytosine) base pair is held together by 3 hydrogen bonds. That is also the reason why the two strands of a DNA molecule can be separated more easily at sections that are densely populated by A - T base pairs.
phospo-di-ester bond
Hydrogen bonds are one of the weakest bonds, and aren't even true bonding of molecules, but rather a magnetic attraction between them. This particular bond is what allows the base pairs of DNA to properly link, as Adenine and thymine bond, and cytosine and guanine bond, but neither of these pairs bonds with elements from the other pair in this way.