Summary/Review of Chapter 281. Draw the structure of Gly-Ala-Phe-Ala, and indicate the preferred conformation of the amidebonds. Which one is the C-terminal, and which is the N-terminal amino acid?2. What is the definition of isoelectric point? If glycine has an isoelectric point of 5.97, does ithave a net negative or net positive charge at pH=7.0 ?'electric neutral' i.e. same amounts of cation and anion. More negative carboxylate anion at pH 7.0.3. Nearly all natural amino acids are called L-amino acids. Draw a Fischer projection ofphenylalanine, showing the absolute configuration. Is it "R" or "S"?4. Predict the products of the following reactions:
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H3C, N-terminal amino acid, CO2Et Ph CO2H, NH H Ph, CO2H H Ph