Summary
Biological molecules are essential components of living organisms, each with specific roles and structures.
- Glycerol — a basic unit of oils and fats, forming the backbone of triglycerides. Example: Glycerol combines with fatty acids to form triglycerides.
- Amino acids — building blocks of proteins, linked by peptide bonds. Example: Proteins are composed of chains of amino acids.
- Enzymes — biological catalysts that speed up chemical reactions, such as breaking down proteins. Example: Proteolytic enzymes like pepsin break down proteins into amino acids.
- Simple sugars — basic units of carbohydrates, forming polysaccharides like starch and glycogen. Example: Glucose is a simple sugar that forms glycogen.
- DNA base pairing — specific pairing of nitrogenous bases in DNA. Example: Adenine pairs with Thymine, and Guanine pairs with Cytosine.
Exam Tips
Key Definitions to Remember
- Glycerol is the backbone of triglycerides.
- Amino acids are the building blocks of proteins.
- Enzymes are biological catalysts.
- Simple sugars are the basic units of carbohydrates.
Common Confusions
- Amino acids are not the building blocks of carbohydrates.
- Fatty acids are not directly the basic units of glycogen.
Typical Exam Questions
- What is the basic unit of oils?
Glycerol - What pairs with Adenine in DNA?
Thymine - What does the Biuret test detect?
Proteins
What Examiners Usually Test
- Understanding of basic units of biological molecules.
- Knowledge of enzyme functions and specificity.
- Ability to identify complementary base pairing in DNA.