A hydrogen bond is when a hydrogen atom is attracted to other atoms like oxygen and fluorine. This is because of their electronegativity. Water is an example of this hydrogen bond between hydrogen and oxygen. Hydrogen bonding is associated with DNA and proteins. In regards to DNA, hydrogen becomes a part of the shape and that determines the role of the person’s physiological or biochemical make-up.
A covalent bond is when two electrons are shared between two atoms. This is called shared pairs. There are different types of covalent bonds and these are the single, double and triple bonds. If there are hydrogen bonds that are holding DNA bases together instead of covalent bonds, this is because of hydrogen bonds being easier to break.