Ch. 26 - Amino Acids, Peptides, and ProteinsWorksheetSee all chapters
All Chapters
Ch. 1 - A Review of General Chemistry
Ch. 2 - Molecular Representations
Ch. 3 - Acids and Bases
Ch. 4 - Alkanes and Cycloalkanes
Ch. 5 - Chirality
Ch. 6 - Thermodynamics and Kinetics
Ch. 7 - Substitution Reactions
Ch. 8 - Elimination Reactions
Ch. 9 - Alkenes and Alkynes
Ch. 10 - Addition Reactions
Ch. 11 - Radical Reactions
Ch. 12 - Alcohols, Ethers, Epoxides and Thiols
Ch. 13 - Alcohols and Carbonyl Compounds
Ch. 14 - Synthetic Techniques
Ch. 15 - Analytical Techniques: IR, NMR, Mass Spect
Ch. 16 - Conjugated Systems
Ch. 17 - Aromaticity
Ch. 18 - Reactions of Aromatics: EAS and Beyond
Ch. 19 - Aldehydes and Ketones: Nucleophilic Addition
Ch. 20 - Carboxylic Acid Derivatives: NAS
Ch. 21 - Enolate Chemistry: Reactions at the Alpha-Carbon
Ch. 22 - Condensation Chemistry
Ch. 23 - Amines
Ch. 24 - Carbohydrates
Ch. 25 - Phenols
Ch. 26 - Amino Acids, Peptides, and Proteins
Sections
Proteins and Amino Acids
L and D Amino Acids
Polar Amino Acids
Amino Acid Chart
Acid-Base Properties of Amino Acids
Isoelectric Point
Additional Practice
Amino Acid Nomenclature
LearnAdditional Practice
Next SectionL and D Amino Acids

What's a protein? Proteins are polypeptides that have some biological function.

Concept #1: Peptides and Polypeptides

Concept #2: Standard Amino Acids

The 20 most common amino acids all share the following traits:

  • A. They are α-amino acids 
  • B. They have an L-(S)-configuration at the chiral carbon
Next SectionL and D Amino Acids
Additional Problems
Which of the following statements about peptide bonds are true? (a) A tripeptide contains three amino acid residues. (b) Peptide bonds are amide linkages. (c) A tetrapeptide contains five amino acid residues. (d) Peptides are polymers of proteins. (e) Peptide bond formation is a hydrolysis reaction.
What does the primary structure of a protein refer to? (i) The orientation of the side chains in three-dimensional space. (ii) The a-amino acid sequence in the polypeptide chain. (iii) The presence of cross-links with disulfide bonds. (iv) The presence of an alpha helix.
The following compound is a(n) _____.a. monomer for polystyreneb. industrial solventc. amino acidd. vitamin