BSC 300 Lecture Notes - Lecture 2: Carboxylic Acid, Phospholipid, Calorie

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Bsc 300 lecture 2- the four types of biological molecules i. Structure and function in cells is closely related to the structure of molecules and atoms. The study of chemistry is essential for understanding cell biology. Covalent bonds- bonds between atoms w/ shared pairs of electrons. Molecules- stable combinations of atoms held together by covalent bonds. Polar molecules have asymmetric distributions of electrical charge. Some biological molecules, like proteins and phospholipids, have both polar and nonpolar regions. Atoms tend to fill their outer electron shell by sharing electrons w/ other atoms. Hydrogen forms a single covalent bond by sharing its unpaired electron. Oxygen forms two covalent bonds by sharing two unpaired electrons. Water results when oxygen bonds w/ two hydrogens. Strong bonds: 80-100 kcal required to break a mole of covalent bonds. Shared electrons stay closest to the nucleus w/ the highest electronegativity. Depends upon the number of protons in nucleus.

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