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Biomolecules: The Four Molecules of Life

Students explore the four macromolecules that make up all living things — carbohydrates, lipids, proteins, and nucleic acids — learning how each is built and the essential job it does in the body.

Grade 9Biochemistry55 minutes1 class period5E ModelExplicit teaching4 StandardsCommon Core
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Lesson at a Glance

Everything you need before the bell rings

Learning Objectives

Students will be able to…

  • ✓Name the four macromolecules.
  • ✓Match each to its function.
  • ✓Give examples of each.
  • ✓Explain why they are carbon-based.
Essential Question

Every living thing — from bacteria to blue whales — is built from just four kinds of large molecules. What are they, and what does each one do?

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Lesson Phases
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Vocabulary Terms
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Standards Aligned
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Interactive Task
Match It · Interactive

Match the Biomolecule

Project this and match each macromolecule to its main function — tap the molecule, then tap what it does.

⚖️ Match each biomolecule to its functionTry it
Biomolecule
Its Function
Tap a molecule, then tap its function!
The Lesson · 5E Model

55 minutes, five moves

Tap any phase to open the teacher moves and student actions.

1

Engage — Built From Four

5 min

All life is built from four kinds of molecules — which four?

👩‍🏫 Teacher Moves

  • Note all living things share a chemistry.
  • Ask what they’re made of.
  • Set the goal: biomolecules.

🎒 Student Actions

  • Consider the shared chemistry.
  • Wonder about it.
  • Predict the four.
2

Explore — Match the Molecules

12 min

Students investigate.

👩‍🏫 Teacher Moves

  • Send students to Match the Biomolecule.
  • Match each pair.
  • Record examples.

🎒 Student Actions

  • Match each pair.
  • Name the function.
  • Record examples.
3

Explain — Four Macromolecules

13 min

Teacher explains.

👩‍🏫 Teacher Moves

  • Explain carbs, lipids, proteins.
  • Explain nucleic acids.
  • Note all are carbon-based.

🎒 Student Actions

  • Explain each.
  • Explain nucleic acids.
  • Note the carbon.
4

Elaborate — Elaborate — In Your Food

12 min

Apply.

👩‍🏫 Teacher Moves

  • Find macromolecules in foods.
  • Explain each one’s role.
  • Connect proteins to enzymes.

🎒 Student Actions

  • Find them in food.
  • Explain roles.
  • Connect to enzymes.
5

Evaluate — Evaluate — Exit Ticket

5 min

Three quick checks.

👩‍🏫 Teacher Moves

  • Hand out the exit ticket.
  • Look for function matches.
  • Collect as formative data.

🎒 Student Actions

  • Name a molecule.
  • Give its job.
  • Give an example.
Standards Alignment

Built to the standards you report on

Aligned to the Next Generation Science Standards (High School Life Science) and Common Core literacy in science.

NGSS
HS-LS1-6

Construct an explanation for how carbon-based molecules are synthesized in organisms.

NGSS
HS-LS1-1

Explain how DNA determines the structure of proteins.

NGSS
HS-LS1-7

Explain how food molecules are used for energy and growth.

CCSS
RST.9-10.4

Determine the meaning of scientific terms and symbols.

Differentiation

One lesson, every learner

Multilingual Learners

ELL / EMERGING READERS
  • Molecule + function cards.
  • Sentence frame: “___ are used for ___.”
  • Sort foods by molecule.

Support & Access

IEP / 504
  • Focus on carbs and proteins.
  • Provide a function chart.
  • Match one pair at a time.

Stretch & Extend

GIFTED / EARLY FINISHERS
  • Explain monomers and polymers.
  • Research enzyme function.
  • Connect molecules to a balanced diet.
Materials

What to gather

  • 📽️Projector / board
  • 📓Science notebooks
  • 💻Match the Biomolecule
  • 🍎Food labels
  • ✏️Pencils
  • 🎫Exit-ticket slips
Vocabulary

Key terms — hover for a quick definition

biomoleculea molecule made by living thingsmacromoleculea large biological moleculecarbohydratea sugar or starch for energylipida fat, oil, or membrane moleculeproteina structural or enzyme moleculenucleic acidDNA or RNAenzymea protein that speeds up reactionsmonomera building-block unit
Evaluate

Exit Ticket

Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.

QUESTION 1
What are the four main macromolecules of life?
Carbohydrates, lipids, proteins, and nucleic acids.
QUESTION 2
Which biomolecule stores genetic information?
Nucleic acids (DNA and RNA).
QUESTION 3
What is one job of proteins in the body?
Building structures (like muscle) or acting as enzymes that speed up reactions.

Going deeper? Monomers to polymers.

Have students explain how small monomers (like amino acids and simple sugars) link into large polymers (proteins and starches). A printable macromolecule sheet is in the Science library.

Study · Flashcards

Study the key terms

Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.

🃏 BiomoleculesFlip
Card 1
Term
Tap to flip →
Meaning
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Practice · Quiz

Check your understanding

A quick self-check with instant feedback, drawn from this lesson’s key terms.

📝 BiomoleculesQuiz
Score: 0
1 / 6
Question 1
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Nice work!

Practice · Worksheet

Printable worksheet

A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.

🖨️ BiomoleculesPrint
Name: ________________________
Date: ____________

Part A · Write the word that matches each meaning

Word bank: biomolecule, carbohydrate, enzyme, lipid, macromolecule, monomer, nucleic acid, protein
  1. a large biological molecule
  2. a structural or enzyme molecule
  3. a fat, oil, or membrane molecule
  4. a sugar or starch for energy
  5. a molecule made by living things
  6. a protein that speeds up reactions
  7. a building-block unit
  8. DNA or RNA

Part B · Show what you learned

  1. What are the four main macromolecules of life?
  2. Which biomolecule stores genetic information?
  3. What is one job of proteins in the body?
Answer key — Part A: 1) macromolecule · 2) protein · 3) lipid · 4) carbohydrate · 5) biomolecule · 6) enzyme · 7) monomer · 8) nucleic acid
Part B: 1) Carbohydrates, lipids, proteins, and nucleic acids. 2) Nucleic acids (DNA and RNA). 3) Building structures (like muscle) or acting as enzymes that speed up reactions.