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DNA Structure

Ninth graders build up the structure of DNA piece by piece, from the nucleotide to the famous double helix, and see how its shape lets it store and copy the instructions for life.

Grade 9DNA Structure55 minutes1 class period5E ModelExplicit teaching4 StandardsNGSS
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Lesson at a Glance

Everything you need before the bell rings

Learning Objectives

Students will be able to…

  • ✓Describe the double helix.
  • ✓Identify a nucleotide.
  • ✓Explain base pairing.
  • ✓Match each DNA part.
Essential Question

A single molecule holds the full set of instructions to build and run a living thing. What is DNA made of, and how does its shape store the code of life?

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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 DNA Part

Project this and match each part of DNA to what it is — tap a term, then tap its description.

🔗 Match each DNA part to what it isTry it
Term
What it is
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The Lesson · 5E Instructional Model (Engage · Explore · Explain · Elaborate · Evaluate)

55 minutes, five moves

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

1

Hook — The Code of Life

5 min

Every cell holds a two-meter strand of DNA coiled inside it. What is it made of?

👩‍🏫 Teacher Moves

  • Show a DNA model.
  • Ask what it stores.
  • Set the goal.

🎒 Student Actions

  • Observe.
  • Guess.
  • Get ready.
2

Use — Match the Part

12 min

Students match each DNA term to its meaning.

👩‍🏫 Teacher Moves

  • Send students to Match the DNA Part.
  • Match each pair.
  • Note the structure.

🎒 Student Actions

  • Match.
  • Say.
  • Note it.
3

Modify — Pair the Bases

13 min

Students apply the base-pairing rules.

👩‍🏫 Teacher Moves

  • Write a short base sequence.
  • Pair each base (A-T, C-G).
  • Check the match.

🎒 Student Actions

  • Write.
  • Pair.
  • Check.
4

Create — Build a Strand

15 min

Students model a DNA segment.

👩‍🏫 Teacher Moves

  • Draw the backbone.
  • Add four base pairs.
  • Label the parts.

🎒 Student Actions

  • Draw.
  • Add.
  • Label.
5

Reflect — Shape Stores Code

5 min

Students reflect on how structure stores information.

👩‍🏫 Teacher Moves

  • How do bases pair?
  • Why is the backbone important?
  • Complete the exit ticket.

🎒 Student Actions

  • Say it.
  • Say it.
  • Complete the exit ticket.
Standards Alignment

Built to the standards you report on

Aligned to the Next Generation Science Standards (High School Life Science).

NGSS
HS-LS1-1

Construct an explanation based on evidence for how the structure of DNA determines the structure of proteins.

NGSS
HS-LS3-1

Ask questions to clarify relationships about the role of DNA and chromosomes in coding the instructions for traits.

NGSS
MS-LS3-1

Develop and use a model to describe why structural changes to genes may affect the proteins that result.

CCSS
RST.9-10.4

Determine the meaning of symbols, key terms, and domain-specific words and phrases in a science text.

Differentiation

One lesson, every learner

Multilingual Learners

ELL / EMERGING READERS
  • Part + description cards.
  • Sentence frame: “A pairs with ___ .”
  • Match one pair at a time.

Support & Access

IEP / 504
  • Start with the backbone and bases.
  • Use a paper DNA-ladder model.
  • Match one part fully before the next.

Stretch & Extend

GIFTED / EARLY FINISHERS
  • Add RNA vs DNA differences.
  • Explain antiparallel strands.
  • Transcribe a strand into mRNA.
Materials

What to gather

  • 📽️Projector / board
  • 🧬DNA model / kit
  • 💻Match the DNA Part
  • 🧶Pipe-cleaner strands
  • ✏️Pencils
  • 🎫Exit-ticket slips
Vocabulary

Key terms — hover for a quick definition

DNAthe molecule that stores genetic instructions in living thingsnucleotidethe building block of DNA: a sugar, a phosphate, and a basedouble helixthe twisted-ladder shape of a DNA moleculebaseone of four chemicals (A, T, C, G) that spell the genetic codebase pairtwo bases joined across the strands: A-T and C-Gbackbonethe sugar-phosphate sides of the DNA laddergenea segment of DNA that codes for a traitcomplementarythe way each base pairs with only its matching base
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 three parts of a nucleotide?
A sugar, a phosphate group, and a nitrogen base.
QUESTION 2
How do the bases pair in DNA?
Adenine pairs with thymine (A-T) and cytosine pairs with guanine (C-G).
QUESTION 3
Why is the double-helix structure useful for storing information?
The paired bases hold the code securely and let DNA be copied exactly when a cell divides.

Create: build a strand.

Have students draw the sugar-phosphate backbone, add four correctly paired bases (A-T, C-G), and label each part of the strand. A printable DNA-structure worksheet 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.

🃏 DNA StructureFlip
Card 1
Term
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Meaning
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Practice · Quiz

Check your understanding

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

📝 DNA StructureQuiz
Score: 0
1 / 6
Question 1
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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.

🖨️ DNA StructurePrint
Name: ________________________
Date: ____________

Part A · Write the word that matches each meaning

Word bank: backbone, base, base pair, complementary, DNA, double helix, gene, nucleotide
  1. one of four chemicals (A, T, C, G) that spell the genetic code
  2. two bases joined across the strands: A-T and C-G
  3. a segment of DNA that codes for a trait
  4. the way each base pairs with only its matching base
  5. the twisted-ladder shape of a DNA molecule
  6. the sugar-phosphate sides of the DNA ladder
  7. the molecule that stores genetic instructions in living things
  8. the building block of DNA: a sugar, a phosphate, and a base

Part B · Show what you learned

  1. What are the three parts of a nucleotide?
  2. How do the bases pair in DNA?
  3. Why is the double-helix structure useful for storing information?
Answer key — Part A: 1) base · 2) base pair · 3) gene · 4) complementary · 5) double helix · 6) backbone · 7) DNA · 8) nucleotide
Part B: 1) A sugar, a phosphate group, and a nitrogen base. 2) Adenine pairs with thymine (A-T) and cytosine pairs with guanine (C-G). 3) The paired bases hold the code securely and let DNA be copied exactly when a cell divides.