Multiple Choice
Which of the following amino acids is most likely to be found in the interior of a globular protein due to its hydrophobic side chain?
18
views
3. Amino Acids
Amino Acid Groups
Struggling with Biochemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following amino acids is classified as a basic amino acid?
A
Aspartic acid (Asp, D)
B
Leucine (Leu, L)
C
Serine (Ser, S)
D
Lysine (Lys, K)
Verified step by step guidance1
Step 1: Understand the classification of amino acids based on their side chain properties. Amino acids can be categorized as acidic, basic, polar, or nonpolar depending on the chemical nature of their R-group (side chain).
Step 2: Recall that basic amino acids have side chains that are positively charged at physiological pH (around 7.4). This is due to the presence of amine groups that can accept protons (H⁺).
Step 3: Analyze the given amino acids: Aspartic acid (Asp, D) has a carboxylic acid group in its side chain, making it acidic. Leucine (Leu, L) has a nonpolar aliphatic side chain, making it hydrophobic. Serine (Ser, S) has a hydroxyl group in its side chain, making it polar but not basic.
Step 4: Identify Lysine (Lys, K) as the correct answer. Lysine has an ε-amino group in its side chain, which is positively charged at physiological pH, classifying it as a basic amino acid.
Step 5: Conclude that Lysine (Lys, K) is the correct answer because its side chain properties align with the definition of a basic amino acid.
Related Videos
Related Practice
Amino Acid Groups practice set
Problem sets built by lead tutorsExpert video explanations