Nucleic Acid Building

Overview

Students investigate how nucleic acids are made of smaller components and how symbols and technical terms communicate meaning in scientific texts. They also connect written information to a simple visual model (diagram/table) and practice summarizing a science passage accurately.

Learning intentions

• Students will be able to determine the meaning of domain-specific words and symbols used in a nucleic-acid text.
• Students will be able to integrate technical information from text with a visual representation (diagram/model/table).
• Students will be able to follow a multistep procedure for a paper-based “model-building” task.
• Students will be able to write an accurate summary that reflects the text’s main conclusion, not prior knowledge.

Success criteria

• I can explain what key terms (e.g., nucleotide, base, sugar, phosphate) mean in context.
• I can use the diagram to explain what part comes from the text and what role it plays.
• I can correctly complete the model-building steps in order and record my observations.
• I can write a short summary that accurately states the passage’s main idea.

Curriculum links

• CCSS.ELA-LITERACY.RST.6-8.4 — Determine meaning of symbols, key terms, and domain-specific words in scientific context.
• CCSS.ELA-LITERACY.RST.6-8.7 — Integrate quantitative/technical information in words with a visual version (diagram/model/table).
• CCSS.ELA-LITERACY.RST.6-8.3 — Follow precisely a multistep procedure for an experiment/technical task.
• CCSS.ELA-LITERACY.RST.6-8.2 and CCSS.ELA-LITERACY.WHST.6-8.2a — Determine central ideas and summarize accurately; introduce and organize ideas with formatting/graphics when useful.

Lesson structure (50 minutes)

1. 0–5 min · Launch & purpose. Teacher posts a question: “How can we describe nucleic acids using smaller parts?” Students do a quick think-write: list any terms they already know from the unit.

2. 5–12 min · Mini-lesson on technical language. Teacher distributes a short science passage titled “Nucleic Acids: Components and Roles,” plus a “word-in-context” chart with 6 blanks for key terms and 3 symbols (e.g., “A, T, C, G” as DNA bases; “RNA” as a technical abbreviation). Teacher models how to find meaning using surrounding sentences and the diagram legend. Students highlight one sentence that gives evidence for each meaning they infer.

3. 12–22 min · Text-to-visual integration. Teacher projects or displays a labeled nucleic-acid diagram (nucleotide with sugar/phosphate/base; DNA base letters; simplified strand model). Teacher asks: “Which label(s) in the diagram match each term from the chart?” Students work in pairs to complete a “Match & Explain” section: for each term, write one sentence linking the text definition to what they see in the visual.

4. 22–35 min · Multistep model-building procedure. Teacher explains the paper-based model task and posts the steps on the board:

• Step 1: Identify whether your model represents DNA or RNA using the passage.
• Step 2: Assemble one nucleotide using the provided parts labeled sugar, phosphate, and base.
• Step 3: Select bases according to the base-letter system shown on the diagram legend.
• Step 4: Arrange 2–3 nucleotides in the correct order indicated by the visual (front/back edges marked).
• Step 5: Record what changes between DNA vs RNA in your chart. Students follow the posted steps exactly, assembling and recording data in their lab notebook or worksheet. Teacher circulates for precision in order and correct base/symbol use.

5. 35–42 min · Procedural check & discussion. Teacher asks two targeted questions: “What step helped you use the symbols correctly?” and “What evidence from the diagram supports your component labeling?” Students share one claim and one piece of evidence with a partner, then volunteer answers.

6. 42–49 min · Accurate summary writing. Teacher provides a “Central Idea Summary” template: “The passage explains that ______. This matters because ______. The key components are ______.” Teacher reminds students to use only evidence from the text and their model notes (no guesses). Students write a 4–6 sentence summary.

7. 49–50 min · Exit ticket. Students answer: “Choose one key term/symbol and explain its meaning using evidence from the passage.” Teacher collects quickly.

Resources

• Short science passage handout: “Nucleic Acids: Components and Roles”
• Labeled nucleic-acid diagram (printed or projected) with a legend for base letters
• “Word-in-context” chart (key terms + symbols)
• Paper model kits: nucleotide parts (sugar, phosphate, base cards labeled with A/T/C/G or RNA-relevant base labels as appropriate), tape or fasteners, and order markers
• “Match & Explain” worksheet linking terms to diagram labels
• Central Idea Summary template
• Student notebooks/lab sheets, pencils, highlighters

Assessment

• Formative checks during the mini-lesson: teacher reviews one pair’s inferred meanings and evidence sentence.
• Model-building accuracy: teacher uses a quick checklist for correct order of steps and correct component labeling.
• Exit ticket: determines whether students can explain a symbol/term using text evidence.
• Summary rubric (lightweight): central idea present, evidence-based, components correctly named.

Differentiation

• Support: Provide sentence starters for word-in-context and Match & Explain (e.g., “In the passage, ____ means… because…”).
• Support: Offer a partially completed diagram key for students who need reduced load; require them to finish only the term-to-label connections.
• Extension: For students ready to go further, ask them to add one sentence explaining how structure relates to function using only information from the passage.
• EAL/SEN: Allow bilingual word banks for key terms if available; allow oral rehearsal with a partner before writing the summary.