Which of the following tripeptides would be expected to be the most hydrophobic?

Question

Which of the following tripeptides would be expected to be the most hydrophobic? Lys-Tyr-Gly Lys-Tyr-AIa Gly-Tyr-AIa Asp-Tyr-Ala Asp-Tyr-Gly Ion exchange chromatography utllizes onion exchange resins to bind: Proteins of high molecular weight insoluble proteins Positively charged proteins negatively charged proteins Proteins that are eluted first out of a gel filtration chromatography column are. Electrically neutral Negatively charged Of higher molecular weight Of lower molecular weight Which of the following amino acids would be last to elute at high pH from an anion-exchange column? lysine alanine glutamic acid asparagine glycine Which statement is not true about the peptide bond? Peptide bond is longer than the typical carbon-nitrogen bond. Rotation is restricted about the peptide bond The peptide bond has partial double bond character The carbonyl oxygen and the amide hydrogen are most often in a trans configuration with respect to one another T

Explanation / Answer

6) Gly-Tyr-Ala : these contain the most hydrophobic amino acids so most likely to be most hydrophobic

7) anion exchange resins bind negatively charged proteins, cation exchange binds positively charged proteins.

8) Gel filteration chromatography is based on size of proteins.

So the larger proteins will elute first [Higher molecular weight proteins]

9) Glutamic acid will be last to elute due to acidic nature.

10) Peptide bond is shorter than C-N bond due to parital double bond character , so false statement is peptide bond is longer than C-N bond.

11) the primary structure of protein describes the specific sequence of amino acids.

12) side chains are alernatively arranged, so false statement is (b)

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