Chemistry of Life
Study Guide : Jalaa Trice
Water
Water is so important because it hydrates us. Covalent bonded, dihydrogen monoxide H2O, unequally shaved electrons cause the molecule to have slight charges on the ends.Water is crucial to your health. It makes up, on average, 60 percent of your body weight. Every system in your body depends on water. Water is made from H2O.
Adhesion and Cohesion
Adhesion and cohesion are water properties that affect every water molecule on earth and also the interaction of water molecules with molecules of other substances. Essentially, cohesion and adhesion are the "stickiness" that water molecules have for each other and for other substances.
polarity
positive charge near the hydrogen atoms and the partial negative charge near the oxygen results in the formation of a hydrogen bond as shown in the illustration. The ability of ions and other molecules to dissolve in water is due to polarity.
pH
pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
Macromolecules
Biological macromolecules are large molecules made up of smaller organic molecules.
There are four classes of macromolecules: carbohydrates, lipids, proteins and nucleic acids.
There are four classes of macromolecules: carbohydrates, lipids, proteins and nucleic acids.
Lipid
A lipid (triglyceride) molecule.
Glucose
Carbohydrate (glucose) molecule in ring form.
The five unlabeled corners represent carbon bonds.
Protein
A protein molecule. X denotes a functional group.