Question

Below is an amino acid chain of 5 amino acids with the R groups labelled 1-5. Answer

the following questions based on the below image (amino acid 1 and 3 are repeated) (15 points)
a. What are the 4 amino acids present in the above chain assuming 1 and 3 are the same?
b. List the above amino acids as Nonpolar, Polar Acidic, Polar Basic or Polar Neutral
c. Which side of the amino acid (right or left) is the C-Terminus?

Answer 1

a: The four amino acids present in the above chain are:

• Alanine (Ala)
• Arginine (Arg)
• Aspartic acid (Asp)
• Serine (Ser)

B: The classification of the above amino acids as nonpolar, polar acidic, polar basic, or polar neutral are:

• Alanine: Nonpolar
• Arginine: Polar basic
• Aspartic acid: Polar acidic
• Serine: Polar neutral

C: The side of the amino acid is Right side

Note that The C-terminus of an amino acid chain is the side that has a free carboxylic acid group (-COOH). So, the C-terminus is on the right side of the image of the amino acid chain.