Summary
Proteins are essential biological molecules made up of amino acids that perform a variety of functions in living organisms.
- Protein — large molecules composed of one or more long chains of amino acids. Example: Enzymes, which speed up chemical reactions in the body.
- Amino Acids — building blocks of proteins, containing an amino group, a carboxyl group, and a unique side chain. Example: Glycine, the simplest amino acid.
- Enzymes — proteins that act as biological catalysts to accelerate chemical reactions. Example: Amylase, which helps break down starch into sugars.
- Peptide Bonds — chemical bonds that link amino acids together in a protein chain. Example: The bond between glycine and alanine in a dipeptide.
Exam Tips
Key Definitions to Remember
- Proteins are large molecules made of amino acids.
- Amino acids are the building blocks of proteins.
- Enzymes are proteins that speed up reactions.
- Peptide bonds link amino acids in proteins.
Common Confusions
- Confusing proteins with carbohydrates.
- Thinking all proteins are enzymes.
Typical Exam Questions
- What are proteins made of? Proteins are made of amino acids.
- How do enzymes function in the body? Enzymes act as catalysts to speed up chemical reactions.
- What is a peptide bond? A peptide bond is a chemical bond linking amino acids in a protein.
What Examiners Usually Test
- Understanding of protein structure and function.
- Ability to identify examples of proteins and enzymes.
- Knowledge of how amino acids form proteins.