Interpretation:
The name of two polar and two non-polar amino acids should be determined.
Concept introduction:
Proteins are
They polymerise by peptide linkage to form dipeptide, oligopeptide and polypeptide molecules. Each peptide bond formation is a condensation reaction that occurs with the elimination of water molecule.
Answer to Problem 42A
Polar amino acids: Serine and Cysteine
Non-Polar amino acids: Glycine, Valine
Explanation of Solution
Polar amino acid is directed towards the outside of the protein because of the hydrophilic properties of side chain whereas the nonpolar amino acid is directed towards the inside of protein (R group repelled by water) because of the hydrophobic nature.
Nonpolar amino acids are: Glycine, Valine
The structure of glycine:
Glycine is nonpolar as it is neutral species; also nonpolar hydrogen is linked as shown below:
The structure of Valine:
Valine is nonpolar as it is neutral species; also nonpolar group is linked as shown below:
Polar amino acids are: Serine and Cysteine
The structure of Serine is:
Serine is polar amino acid as it consists of polar R group:
The structure of cysteine is:
Serine is polar amino acid as it consists of polar R group:
Chapter 23 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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