Biology Lecture 2 - Biology Lecture 2 Key Molecules of...

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Biology Lecture 2 Key Molecules of Semester: Carbohydrates, lipids, proteins, and nucleic acids Matter is made up of elements Element- 92 naturally occurring; it cannot be broken into other substances by chemical reactions Molecule- 2 or more atoms bonded covalently to each other Compound- substance consisting of two or more different elements Each element has unique atoms Atoms are composed of subatomic particles Neutrons Protons Electrons Behavior of atom is based on distribution of electrons on outer shell Periodic table shows this to us Each row shows us the amount of shells Elements with full shells are chemically inert Atoms with incomplete valence shells can: Share covalent bond electrons Covalent bond- the sharing of a pair of valence electrons by two atoms (molecules) Strongest chemical bonds (80 kilocalories per mole) Important biological elements tend to form covalent bonds Single bond- sharing of 1 pair of valence electrons Electronegativity- an atom’s attraction for electrons in a covalent bond
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This note was uploaded on 05/03/2011 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas.

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Biology Lecture 2 - Biology Lecture 2 Key Molecules of...

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