Amino Acids Review

Topics: Amino acid, Essential amino acid, Proteinogenic amino acids Pages: 3 (346 words) Published: November 12, 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)

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

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 functional...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Amino Acids Essay
  • Amino acids Essay
  • Essay about Amino Acids
  • Identification of Amino Acids Essay
  • Characteristics and Properties of Amino Acids Essay
  • Titration: Identification of an Unknown Amino Acid Biochemistry Essay
  • Determination of an Unknown Amino Acid from Titration Essay

Become a StudyMode Member

Sign Up - It's Free