Amino Acids Review

Topics: Amino acid / Pages: 2 (346 words) / Published: Nov 12th, 2012
Alanine (ala, A) (neutral, non-polar)

Arginine (arg, R) (basic, polar)

Asparagine (asn, N) (neutral, polar)

Aspartic Acid (asp, D) (acidic, polar)

Cysteine (cys, C) (neutral, slightly polar)

Glutamic Acid (glu, E) (acidic, polar)

Glutamine (gln, Q) (neutral, polar)

Glycine (gly, G) (neutral, non-polar)

Histidine (his, H) (basic, polar)

Isoleucine (ile, I) (neutral, non-polar)

Leucine (leu, L) (neutral, non-polar)

Lysine (lys, K) (basic, polar)

Methionine (met, M) (neutral, non-polar)

Phenylalanine (phe, F) (neutral, non-polar)

Proline (pro, P) (neutral, non-polar)

Serine (ser, S) (neutral, polar)

Threonine (thr, T) (neutral, polar)

Tryptophan (trp, W) (neutral, slightly polar)

Tyrosine (tyr, Y) (neutral, polar)

Valine (val, V) (neutral, non-polar)

Questions 1.) Rank the following amino acids by increasing polarity. (i.e. 1 = more non-polar) ser ; glu ; asp ; lys ; ala ; gln 2.) Which amino acid is most insoluble in water: isoleucine or alanine? 3.) Which amino acid is most soluble in water: lys or ser? 4.) Rank the following according to increasing non-polarity (i.e. 1 = least non-polar, 4 = most non-polar) leu; phe; val; ala

Answers 1.) 1 = ala, 2 = lys, 3 = ser, 4 = glu, 5 = asp, 6 = gln 2.) Isoleucine has more CH’s, therefore more insoluble than alanine 3.) Ser because the alcohol group is more polar than the amine in lys 4.) 1 = ala, 2 = val, 3 = leu, 4 = phe (ranking is based on ↑ # of CH’s)

Principles of Polarity * The greater the electronegativity difference between atoms in a bond, the more polar the bond. Partial negative charges are found on the most electronegative atoms, the others are partially positive. In general, the presence of an oxygen is more polar than a nitrogen because oxygen is more electronegative than nitrogen. * The combination of carbons and hydrogens as in hydrocarbons or in the hydrocarbon portion of a molecule with a

You May Also Find These Documents Helpful

  • Amino Acids
  • Amino Acids
  • Amino acids
  • Amino Acids
  • Amino Acids
  • Electrophoresis of Amino Acids
  • Amino Acid Metabolism
  • Identification of Amino Acids
  • Amino Acid Chromatography
  • 1.05 amino acids