#Question id: 179
#Unit 1. Molecules and their Interaction Relevant to Biology
The average molecular weight of the 20 standard amino acids is 138, but biochemists use 110 when estimating the number of amino acids in a protein of known molecular weight. Why?
#Question id: 180
#Unit 1. Molecules and their Interaction Relevant to Biology
Which of the following statements about aromatic amino acids is correct?
#Question id: 181
#Unit 1. Molecules and their Interaction Relevant to Biology
Titration of valine by a strong base, for example NaOH, reveals two pK’s. The titration reaction occurring at pK2 (pK2 = 9.62) is:
#Question id: 182
#Unit 1. Molecules and their Interaction Relevant to Biology
Which amino acid is least likely to participate in acid-base catalysis?
#Question id: 183
#Unit 1. Molecules and their Interaction Relevant to Biology
At pH 7.0, converting a glutamic acid to gamma-carboxyglutamate, will have what effect on the overall charge of the protein containing it?
#Question id: 184
#Unit 1. Molecules and their Interaction Relevant to Biology
What is the approximate charge difference between glutamic acid and alpha-ketoglutarate at pH 9.5?