#Question id: 158
#Unit 1. Molecules and their Interaction Relevant to Biology
At the isoelectric pH of a tetrapeptide:
#Question id: 159
#Unit 1. Molecules and their Interaction Relevant to Biology
The chirality of an amino acid results from the fact that its alpha carbon:
#Question id: 160
#Unit 1. Molecules and their Interaction Relevant to Biology
Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________.
#Question id: 161
#Unit 1. Molecules and their Interaction Relevant to Biology
Two amino acids of the standard 20 contain sulfur atoms. They are:
#Question id: 162
#Unit 1. Molecules and their Interaction Relevant to Biology
All of the amino acids that are found in proteins, except for proline, contain a(n):
#Question id: 163
#Unit 1. Molecules and their Interaction Relevant to Biology
Which of the following statements about cystine is correct?