Multiple Choice
Where would the leucine side chain most likely be found in a protein dissolved in water?
24
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 best describes a dipeptide?
A
A molecule formed by the linkage of three amino acids
B
A molecule consisting of two peptide bonds and three amino acids
C
A molecule composed of a single amino acid
D
A molecule formed by the linkage of two amino acids via a peptide bond
Verified step by step guidance1
Understand the term 'dipeptide': A dipeptide is a molecule formed when two amino acids are linked together by a single peptide bond. This bond is formed through a condensation reaction where a molecule of water is removed.
Recall the structure of amino acids: Each amino acid has an amino group (-NH₂), a carboxyl group (-COOH), a hydrogen atom, and a unique side chain (R group) attached to a central carbon atom.
Learn how a peptide bond is formed: During the condensation reaction, the carboxyl group (-COOH) of one amino acid reacts with the amino group (-NH₂) of another amino acid, releasing a water molecule (H₂O) and forming a covalent bond between the two amino acids.
Differentiate between dipeptides and other peptides: A dipeptide specifically refers to a molecule formed by two amino acids linked by one peptide bond. Molecules with three amino acids linked by two peptide bonds are called tripeptides, and so on.
Verify the correct answer: Based on the definition and formation process, the correct description of a dipeptide is 'A molecule formed by the linkage of two amino acids via a peptide bond.'
Related Videos
Related Practice
Amino Acid Groups practice set
Problem sets built by lead tutorsExpert video explanations