Jan. 5 lecture

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10 Jan 2011
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Jan 5 (Continuing Proteins)
-Primary structure tells us the order the amino acids are put together
-polar covalent amide bonds
-Alpha-helix is the most common tertiary structure
-globular Tertiary structure
-proline: because of its cyclic structure, it can often be found in the bend portion of a
protein chain
-R groups sticking out of part of the protein may attract another R group sticking out from
another part of the protein. Responsible for the shape of proteins
Protein Structure:
-Primary: order or sequence of amino acids held together by covalent (peptide) bonds
-Secondary: arrangement of protein chain, sheet, or helix held together by hyrdrogen bonds
-Tertiary: Bending of helix into a globule
Full range of Bonding (Ionic, covalent, and hydrogen bonds)
-Quaternary: not for all proteins. Means by which a # of globules are held together
-The 3D structure of proteins directly dictate their function
-Nucleic acids have a diff. building block than proteins
Nucliec Acids:
Sugar + Amine base nucleoside
+ Phosphate Nucleotide (monomer of nucleic acids) Nucleic Acid
DNA
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