We Have Treated a Protein with Chymotrypsin (Cleaves at Aromatic

question 159

Multiple Choice

We have treated a protein with chymotrypsin (cleaves at aromatic amino acid residues) and have isolated a polypeptide fragment produced during the chymotryptic digestion. The amino acid composition of the polypeptide was found to be amino acid moles/mole polypeptide lysine (lys) 2 glycine (gly) 1 serine (ser) 1 phenylalanine (phe) 1. The N-terminal amino acid, determined by the dansylation procedure, was serine. Treatment of the polypeptide with trypsin (cleaves at basic amino acid residues) gave two dipeptides plus free phenylalanine What is the amino acid sequence of this polypeptide?

• A) ser-gly-lys-phe-lys
• B) gly-lys-ser-lys-phe
• C) ser-gly-lys-lys-phe
• D) phe-lys-gly-ser-lys
• E) ser-lys-gly-lys-phe

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Definitions:

Foster Homes

Residential settings where children who cannot live with their biological parents are placed under the care of a foster family.

Adoptive Homes

Households in which children have been legally adopted and are raised by parents who are not their biological parents.

Social Responsiveness

The capacity of an individual to engage in social interactions by understanding and reciprocating social cues, behaviors, and emotions.

Adopted Children

Children who are legally taken and raised by parents who are not their biological parents, forming a permanent family bond.