BIOSC 0150 Lecture Notes - Lecture 5: N-Terminus, Beta Sheet, Chemical Polarity

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Most proteins are composed of just 20 different amino acids. All amino acids share a common structure. All 20 amino acids have a common core structure with a central carbon atom bonded to these 4 different atoms of groups of atoms. The combination of amino and carboxyl groups is key to how the amino acid behaves. In a ph 7, the concentration of protons causes the amino group (nh2) to act as a base, attracting another proton to create nh3+. The carboxyl group is acidic because the 2 o atoms are extremely electronegative, pulling electrons away from the h atom, making it relatively easy for it to lose a proton to form coo- The charges on these 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.

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