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Lipid Structure Labeling Worksheet

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Lipid Structure Labelling Worksheet

Lipid molecules illustration

🧬 Part 1: Lipid Structure Labelling

1. Label the triglyceride molecule below:

Triglyceride Structure

A: _________________ (backbone molecule)

B: _________________ (type of chain - 3 present)

C: _________________ (type of bond linking components)

2. Label the phospholipid molecule below:

Phospholipid Structure

D: _________________ (backbone molecule)

E: _________________ (hydrophilic head group)

F: _________________ (hydrophobic chains - 2 present)

G: _________________ (bonds connecting fatty acids to backbone)

3. Complete the following statements about lipid polarity:

The phosphate head of a phospholipid is _________________ (hydrophilic/hydrophobic).

The fatty acid tails of a phospholipid are _________________ (hydrophilic/hydrophobic).

A triglyceride molecule is overall _________________ (polar/non-polar).

📝 Part 2: Structure and Function

4. Explain why phospholipids are suitable for forming cell membranes:
5. State two functions of triglycerides in living organisms:
6. Compare the number of fatty acid chains in triglycerides and phospholipids:

Triglycerides: _______ fatty acid chains

Phospholipids: _______ fatty acid chains

Explain why this difference is important: ________________________________

🔬 Part 3: Multiple Choice

7. Which molecule forms the backbone of both triglycerides and phospholipids?

Glucose

Glycerol

Phosphate

Amino acid

8. What type of bond links fatty acids to glycerol?

Hydrogen bond

Ionic bond

Ester bond

Peptide bond

9. Which properties make triglycerides good energy storage molecules? (Select all that apply)

High energy content per gram

Insoluble in water

Easily broken down

Contain phosphate groups

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