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Protein Synthesis: From DNA to Protein

Ninth graders trace how a cell turns the instructions in DNA into working proteins — through transcription (DNA to mRNA) and translation (mRNA to protein at the ribosome) — the central process of molecular biology.

Grade 9Molecular Biology55 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…

  • ✓Explain transcription.
  • ✓Explain translation.
  • ✓Describe mRNA and codons.
  • ✓Trace DNA → protein.
Essential Question

DNA holds the instructions for life — but DNA never leaves the nucleus. So how does the cell turn a gene into an actual working protein out in the cell?

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Lesson Phases
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Vocabulary Terms
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Standards Aligned
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Interactive Task
Explore · Interactive

Protein Synthesis Check

Project each item and have students trace the steps. The tool explains transcription, translation, mRNA, and codons.

🧬 Trace DNA to proteinTry it
Answer each question about protein synthesis.
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

Engage — DNA Stays Home

5 min

DNA never leaves the nucleus — so how does it build proteins outside?

👩‍🏫 Teacher Moves

  • Pose the nucleus puzzle.
  • Introduce a messenger.
  • Pose the question.

🎒 Student Actions

  • See the puzzle.
  • Wonder the messenger.
  • Predict the idea.
2

Explore — Explore the Steps

12 min

Students investigate.

👩‍🏫 Teacher Moves

  • Send students to Protein Synthesis Check.
  • Note transcription.
  • Note translation.

🎒 Student Actions

  • Answer them.
  • Note transcription.
  • Note translation.
3

Explain — Transcription & Translation

13 min

Students explain.

👩‍🏫 Teacher Moves

  • Explain DNA → mRNA.
  • Explain mRNA → protein.
  • Explain codons.

🎒 Student Actions

  • Explain transcription.
  • Explain translation.
  • Explain codons.
4

Elaborate — Trace the Path

15 min

Students elaborate.

👩‍🏫 Teacher Moves

  • Trace a gene to a protein.
  • Decode a codon.
  • Connect genes to traits.

🎒 Student Actions

  • Trace the path.
  • Decode a codon.
  • Connect it.
5

Evaluate — Evaluate

5 min

Students conclude.

👩‍🏫 Teacher Moves

  • Explain the two steps.
  • Trace DNA to protein.
  • Hand out the exit ticket.

🎒 Student Actions

  • Explain it.
  • Trace 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

Explain how the structure of DNA determines the structure of proteins.

NGSS
HS-LS3-1

Explain how DNA and genes carry instructions for traits.

NGSS
HS-LS1-6

Explain how large molecules like proteins are built.

NGSS
SEP-2

Developing and using models.

Differentiation

One lesson, every learner

Multilingual Learners

ELL / EMERGING READERS
  • DNA → mRNA → protein flowchart.
  • Sentence frame: “Transcription copies DNA into ___.”
  • Use codon-model beads.

Support & Access

IEP / 504
  • Focus on the two steps.
  • Use a flowchart.
  • Decode a simple codon.

Stretch & Extend

GIFTED / EARLY FINISHERS
  • Decode a full mRNA strand.
  • Explain a mutation’s effect.
  • Model the ribosome.
Materials

What to gather

  • 📽️Projector / board
  • 🧬DNA/RNA models
  • 💻Protein Synthesis Check
  • 📄Codon charts
  • ✏️Pencils
  • 🎫Exit-ticket slips
Vocabulary

Key terms — hover for a quick definition

protein synthesisbuilding proteins from DNA instructionstranscriptioncopying DNA into mRNAtranslationbuilding a protein from mRNAmRNAmessenger RNAcodona three-base mRNA “word”ribosomethe site of translationamino acida building block of proteinsgenea segment of DNA coding for a protein
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 happens during transcription?
A gene’s DNA is copied into mRNA.
QUESTION 2
What is a codon?
A group of three mRNA bases that codes for one amino acid.
QUESTION 3
What is the final product of protein synthesis?
A protein — a chain of amino acids.

Elaborate: mutations.

Have students change one DNA base and trace how it changes the mRNA, the codon, and possibly the protein — seeing how a mutation works. A printable protein-synthesis 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.

🃏 Protein SynthesisFlip
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.

📝 Protein SynthesisQuiz
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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.

🖨️ Protein SynthesisPrint
Name: ________________________
Date: ____________

Part A · Write the word that matches each meaning

Word bank: amino acid, codon, gene, mRNA, protein synthesis, ribosome, transcription, translation
  1. building a protein from mRNA
  2. building proteins from DNA instructions
  3. a segment of DNA coding for a protein
  4. a building block of proteins
  5. messenger RNA
  6. the site of translation
  7. copying DNA into mRNA
  8. a three-base mRNA “word”

Part B · Show what you learned

  1. What happens during transcription?
  2. What is a codon?
  3. What is the final product of protein synthesis?
Answer key — Part A: 1) translation · 2) protein synthesis · 3) gene · 4) amino acid · 5) mRNA · 6) ribosome · 7) transcription · 8) codon
Part B: 1) A gene’s DNA is copied into mRNA. 2) A group of three mRNA bases that codes for one amino acid. 3) A protein — a chain of amino acids.