BIOL 1361 Lecture Notes - Lecture 3: Hydrophile, Antibody, Thiol

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Most of our bodies proteins are composed of 20 different building blocks called amino acids. In all 20 amino acids, a central carbon atom (alpha carbon) bonds covalently to the four different atoms or groups of atoms listed below: In water (ph of 7) amino acids ionize. The concentration of protons at this ph causes the amino group to act as a base, attracting a proton to form nh3+. The two highly electronegative oxygen atoms in the group pull the electron away from its hydrogen atom, which means that it is relatively easy for this group to lose a proton to form coo-. The charges of the functional groups are important because : They help amino acids stay in solution, where they can interact with one another and with other solutes. They affect the amino acid"s chemical reactivity. R - group - or side chain, makes each 20 dif amino acid unique (20 different r groups. )

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