OpenSciEd MS 6.6 (Grade 6 Cells & Systems / Healing) - An OpenSciEd biology unit. FIRST CONFIRMED FSE (Great Oxygenation Event misattributed to archaea instead of cyanobacteria). Foundation 0% Not Recommended + 92.9% Practices green. Cells-without-Molecules pattern (biology analog of 6.2 Particle-without-Atom).
| Program | OpenSciEd Middle School |
| Unit | Grade 6, Unit 6.6: Cells & Systems (Healing) |
| Publisher | OpenSciEd |
| Author | OpenSciEd Curriculum Development Team |
| Grade Band | Grade 6 (6-8 calibration applied) |
| NGSS Alignment | MS-LS1-1, MS-LS1-2, MS-LS1-3 |
OpenSciEd Middle School Unit 6.6 (Grade 6 Cells & Systems / Healing) is the An OpenSciEd biology unit and the an OpenSciEd unit with a confirmed FSE in author voice.
Foundation 0% (floored from −15%): 100% gap + 4 map errors (12pt penalty) + 1 confirmed FSE (3pt penalty per user policy). Practices 92.9% green.
The confirmed FSE: "When consuming large quantities of carbon dioxide, iron, and sulfur, which were more common in Earth's early history, archaea turned them into nontoxic substances like oxygen." (Lesson 10 Archaea Reading). This is biologically incorrect. The Great Oxygenation Event (~2.4 billion years ago) is overwhelmingly attributed to cyanobacteria - a domain of Bacteria, not Archaea. Most archaea do not release O₂; methanogenic archaea produce methane. Furthermore, oxygenic photosynthesis uses water (H₂O) and CO₂ - not iron and sulfur - as substrates. Confirmed FSE; 3-pt penalty applied.
The Cells-without-Molecules pattern: The unit introduces cells as central entity (NGSS MS-LS1-1) through microscopy across L4-L7. Cell theory is built empirically. Cell division for healing (L9). Cell membrane function (L11). But molecular biology is deferred - DNA, organelles (nucleus, mitochondria, chloroplasts), proteins, lipids, signaling molecules - all forward-referenced to OpenSciEd Units 7.4 (Maple Syrup) and 8.5 (Muscles). This is the biology analog of 6.2's Particle-without-Atom pattern.
Of 20 mechanism passages: 0 TRUE, 0 SCAFFOLDED, 20 UNSCAFFOLDED. Cellular grounding at NGSS-PE level without going to molecular biology.
4 map errors: 2 REI substance-model ("bacteria need food to make energy", "yeast must digest food in order to get the energy they need"); 2 AEC vague-entity ("food particles", generic "substances like water, oxygen, carbon dioxide, ammonia, or sulfur").
Cross-programs reviewed signal: Three Grade 6 OpenSciEd units now reviewed - all three at Foundation 0%, but for THREE different reasons: 6.1 no particles at all (Type 6); 6.2 particles but no atoms (Particle-without-Atom); 6.6 cells but no molecules + confirmed FSE (Cells-without-Molecules + FSE). OpenSciEd's 5.2 particle introduction does NOT propagate as molecular-grounded mechanism across any Grade 6 DCI thread.
The unit anchors on a middle school student's foot injury that healed over 4 months. 14 lessons.
Lessons 1-7 (Body parts → cells): Anchoring; chicken wing dissection; medical images; blood/nerve microscopy; cells revealed in bone/muscle/skin (L6); cell theory L7.
Lessons 8-13 (Healing and growth): Skin healing time-lapse; cell division L9; bacteria growth L10 (includes the FSE in supplementary readings); cell membrane L11; body systems healing L12; growth = healing analog L13.
Lesson 14 (Disability and accessibility): Pivot to perspectives on ability/disability. Designing accessible environments - identity/equity content.
Central science model: Body parts → tissues → cells. Cells grow and divide to fill gaps during healing. Cells need food. Cell membrane controls what enters/leaves. Body systems interact. What is absent: molecular biology, deferred to later units.
"MS-LS1-1, MS-LS1-2, MS-LS1-3 - all living things made of cells; cells have structures responsible for functions; multicellular organisms have systems of interacting subsystems." (Unit Overview, p. 10)
NGSS PE bundle. Cellular level explicit; molecular biology not required by PEs.
"Other structures of the cell will be discovered in future units: OpenSciEd Unit 7.4 (Maple Syrup Unit) - mitochondria and chloroplasts; and OpenSciEd Unit 8.5 (Muscles Unit) - nucleus and chromosomes." (Teacher Background, p. 21)
⭐ Explicit deferral of molecular biology. Cells-without-Molecules pattern by design.
"When consuming large quantities of carbon dioxide, iron, and sulfur, which were more common in Earth's early history, archaea turned them into nontoxic substances like oxygen. In this way, archaea changed the surface of Earth to make it more habitable for other organisms." (Lesson 10 Archaea Reading)
⭐ CONFIRMED FSE. Great Oxygenation Event misattributed to archaea instead of cyanobacteria. Biochemically incorrect substrates. 3-pt penalty applied.
"Bone, muscle, and skin are made up of repeating patterns of microscopic structures called cells, and groups of these cells form tissues. Cells that make up different tissues are structured differently, depending on their function in the body." (Lesson 6)
Central cell theory grounding. NGSS-PE met at cellular level; molecular biology absent.
"New cells come from old cells, which grow and split through a repeated and nonrandom process. A gap in the skin, muscle, or bone is filled by new cells as a result of cells growing and splitting." (Lesson 9)
Cell division as healing mechanism. No DNA replication, mitosis machinery, or cell cycle.
"Just like our own cells, bacteria need food to make energy to live and grow." (Lesson 10 Bacteria reading)
REI substance-model: energy framed as substance cells make.
"Blood is a mixture of blood cells, water, food particles, vitamins, and electrolytes." (Lesson 4 "What Is Blood?" reading)
AEC vague-entity: "food particles" without molecular identification.
Practices: 92.9% green. Five Intentionally Developed, two Present, one Partial. Distinctive strengths: (1) Identify and Interpret (I²) strategy L10 - explicit image-analysis protocol; (2) microscope-image-based modeling across L4-L11; (3) co-construction of healing-process explanations L12; (4) L14 pivot to disability perspectives - identity/equity content; (5) cell-theory argumentation from microscopic evidence L7. Practice 3 (Investigations) is Partial because investigations are predominantly OBSERVATIONAL - E. coli growth runs as class demonstration, not student-designed. Engineering Design (Practice 7) N/A for biology unit.
Two categories of change:
A. Add molecular grounding to target-concept passages: L4 "food particles" → "glucose molecules, amino acids"; L10 readings introduce molecular biochemistry (sugar molecules in fermentation, photosynthesis substrates, ATP); L11 cell membrane = phospholipid bilayer.
B. CORRECT THE ARCHAEA/OXYGEN FSE. The Great Oxygenation Event needs attribution to cyanobacteria (Bacteria), not archaea. Required factual correction.
Option A (Rewrite, ~30-50%): Molecular grounding in L4 + L10; FSE corrected.
Option B (Conditional, ~60-70%): A above + L11 phospholipid bilayer + L9 brief DNA mention.
Option C (Recommended, ~80%+): Restructure L4-L12 to integrate molecular biology throughout.
Practices improvement: Practice 3 Partial → Present by having students design an investigation procedure from scratch (e.g., student-designed bacterial-growth test).
| Total Passages Scored | 30 |
| Raw Gap Error | 100.0% (no passage names DNA, organelles, proteins, lipids, or molecular biology entities) FALSE = atoms/molecules not present before students are asked to explain. The student is navigating without a starting point. |
| Adjusted Gap Error | 100.0% (20/20 mechanism passages UNSCAFFOLDED - cellular grounding without molecular biology) UNSCAFFOLDED = no atomic grounding at all. LESSON_ATOMS = atoms mentioned elsewhere in lesson but not connected to this concept. |
| Substance-Model Errors (REI) | 2 Curriculum treats a process or outcome as a substance - "heat flows," "energy is stored," "electricity flows like water." Student builds a substance ontology. |
| Label-as-Explanation (LAE) | 0 Curriculum provides a name and treats it as an explanation - "this happens because of gravity." Student believes knowing the name IS understanding the concept. |
| Vague-Entity Errors (AEC) | 2 Curriculum uses vague entities ("tiny particles," "building blocks") without specifying atoms or molecules. Student invents their own model with macroscopic properties. |
| Factual Science Errors (FSE) | 0 total (1 confirmed, -1 review) Statements that are scientifically incorrect - not imprecise framing, but wrong. Any confirmed FSE = Not Recommended. |
| Practices | 92.9% - Deep Seven practices scored PRESENT, PARTIAL, or ABSENT and averaged: asking questions, developing and using models, planning and carrying out investigations, analyzing and interpreting data, using mathematics, constructing explanations and designing solutions, and argument from evidence. Higher is better, the opposite direction from gap and map errors. Reported but not part of the Foundation Score or the verdict. |
OpenSciEd MS 6.6 is an OpenSciEd biology unit. CONFIRMED FSE IN OPENSCIED: Great Oxygenation Event misattributed to archaea (should be cyanobacteria, a domain of Bacteria). Cells-without-Molecules sub-pattern: biology analog of 6.2's Particle-without-Atom. Three Grade 6 units now at Foundation 0% for THREE different reasons - 6.1 no particles, 6.2 particles without atoms, 6.6 cells without molecules + confirmed FSE.
Strong middle-school inquiry pedagogy on the biology side: cell theory built empirically through microscopy L4-L7; healing-process modeling L8-L12; I² strategy for image analysis. L14 pivot to disability perspectives is unusual and valuable - identity/equity content complementing biology. Five Intentionally Developed practices.
shallow by design + confirmed FSE - 2 REI substance-model errors (bacteria/yeast "make/get energy" - widespread Grade 6 biology simplification, but installs substance-model framing). 2 AEC vague-entity errors ("food particles", generic substances). 1 CONFIRMED FSE in author voice - Great Oxygenation Event misattribution. Cellular grounding throughout but molecular biology explicitly deferred to later units.
Evidence for every entry is published at three levels. Each level states what it contains and what it leaves out.
Scores, verdict, and the full pattern count for this unit are above: adjusted gap, REI / LAE / AEC counts, FSE status, and the seven-practice score. The analysis quotes 7 passages verbatim from the curriculum.
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