Which of the following amino acids contains two stereocenters? isoleucinc prolin

Question

Which of the following amino acids contains two stereocenters? isoleucinc proline phenylalanine Glutamine What are the R/S designations of the two stereocenters of isolcucine? 2R.3R 2R.3S 2S, 3R 2S.3S What are the R/S designations of the two stereocenters of L-threonine? 2R, 3R 2R.3S 2S.3R 2S.3S Which of the following is a definition of the isoelectric point of an amino acid? The pH at which an amino acid has no net charge the pH at which the alpha-NH_2 group is completely protonated The melting point of on amino acid The conductivity of a 1 M solution of an amino acid in water

Explanation / Answer

14. answer: a

15. from the structure

answer:d. 2s, 3s

16. answer: 2s,3R

17. answer: a

at isoelectric point , there is no net charge for aminoacids.

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