Deficiencies in this vitamin can lead to adrenal stress and high cortisol levels or cortisol depletion as your body attempts to make up for the vitamin deficiency by using this hormone's overdrive mechanism, which is usually reserved for emergencies, illness and other stressful events.
The reason why it is advantageous to have weak hydrogen bonds between complementary base pairs and strong covalent bonds between phoshate and deoxyribose groups in a DNA molecâ¦ule is because the strong covalent bonds running along the  ladder  of the DNA molecule ( the phospate and deoxyribose units ) keep the molecule together during its ...
Share. Covalent Bond Definition: A covalent bond is a chemical link between two atoms in which electrons are shared between them. Examples: There is a covalent bond between the oxygen and each hydrogen in a water molecule (H 2 O).Each of the covalent bonds contains two electrons-one from a hydrogen atom and one from the oxygen atom. Both atoms share the electrons.Return to the Chemistry Glossary Index.xamples: There is a covalent bond between the oxygen and each hydrogen in a water molecule (H 2 O). Each of the covalent bonds contains two electrons-one from a hydrogen atom and one from the oxygen atom.