Properties - number of positive and negative charges called...

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Properties When amino acids are dissolved in water, the amino and carboxyl groups act as bases and acids respectively as shown in Fig. 4 . Therefore, amino acids are considered to be Zwitterionic (possessing both - and + charge) and amphoteric (able to act as an acid or as a base) Amino acids can act as buffers (resistant to pH change) in a pH range which is + or - 1 pH unit from their pKa values (pKa = -log Keq for acid dissociation). The point on a titration curve, as shown in Fig. 4 , where the amino acid has an equal
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Unformatted text preview: number of positive and negative charges called the isolelectric point because such molecules when placed in an electric field will be unable to migrate to either the anode or cathode. The pH at which the isolelectric point occurs is called the pI . Functional Grouping Just twenty different amino acids are used to synthesize proteins. They can be described by 3 letter abbreviations or 1 letter abbreviations and are distinguished by the nature of their R-groups ( Table 1 ). Amino acids fall into four groups:...
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This document was uploaded on 11/03/2011 for the course BIOLOGY MCB2010 at Broward College.

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