Week 2: Week 2 Content
Grade 7 Science | Rosche | Kairos Academies
**Scientists Like Us:** In this lesson, you'll work as a team of scientists investigating [topic-specific content]. Every scientist brings unique perspectivesβyour ideas matter!
**Community Connection:** This phenomenon affects our community in [topic-specific content]. You'll investigate how scientists use evidence to understand [topic-specific content] in places like ours.
**Progress Checkpoint:** You've completed [topic-specific content]. Next up: [topic-specific content].
**Pair-Share:** First, think about [topic-specific content] on your own (1 min). Then share with your partner (2 min). Finally, we'll discuss as a class.
Accessibility & Learning Support
- Need text read aloud? Chrome: Right-click then "Read aloud" | Edge: Click speaker icon in address bar
- Working from home? Look for the HOME ALTERNATIVE boxes at each station
- Need extra support? Click the green "Need help?" buttons for hints and sentence starters
- Stuck? Look for the red "Stuck?" boxes with step-by-step help
NGSS Standards Covered This Week
MS-LS1-2 (Primary)
What it means: Develop and use a model to describe the function of a cell as a whole and ways the parts of cells contribute to the function.
In student language: I can create models showing how specialized cells have structures that match their specific jobs.
3-Dimensional Learning
| Dimension | What You'll Practice |
|---|---|
| SEP-2 Developing & Using Models | Design a specialized cell model |
| DCI LS1.A Structure & Function | How cell structure relates to specialized function |
| CCC-6 Structure & Function | Connect specialized cell parts to cell jobs |
Success Criteria - How You'll Know You've Got It
Target 1: Explain that cells with the same DNA can become different types
Self-check: Can I explain WHY a muscle cell and neuron look different even though they have identical DNA?
Target 2: Identify how cell structure relates to specialized function
Self-check: Can I explain HOW a neuron's long extensions help it send signals quickly?
Target 3: Describe the hierarchy: cells β tissues β organs β systems
Self-check: Can I trace the organization from a single muscle cell up to the whole muscular system?
Why This Matters to YOU:
You have over 200 cell types with identical DNA! Brain cells send signals at 268 mph, red blood cells squeeze through tiny vessels, and muscle cells contract with force. Cell specialization explains your body's incredible abilities.
The Phenomenon: Same DNA, Different Jobs
Consider this puzzling fact:
- A neuron (nerve cell) has long, branching extensions and can send electrical signals at 268 mph
- A red blood cell is shaped like a flattened disc and has NO nucleus at all
- A muscle cell is long and filled with fibers that can contract with force
- All three cells came from the same person and have IDENTICAL DNA
If they all have the same genetic instructions, why do they look and act so completely different?
Focus Question: Why do different body parts look and act so differently if they all came from one cell?
Learning Targets
By the end of this week, you will be able to:
Vocabulary
Cognate Strategy: Many science words look similar in English and Spanish β use your Spanish to learn science!
| Term | Spanish | Definition |
|---|---|---|
| specialized cell | celula especializada | A cell with a specific job and structure to match |
| tissue | β | A group of similar cells working together |
| organ | organo | Different tissues working together (like your heart) |
| gene expression | expresion genetica | When genes are "turned on" to make proteins |
| neuron | neurona | A nerve cell that sends electrical signals |
| epithelial tissue | tejido epitelial | Tissue that covers and lines surfaces (skin, mouth, intestines) |
Worked Example
Step-by-Step Problem Solving
Problem Scenario
Review the problem scenario and work through each step below.
Practice These Vocabulary Terms
Meet the Scientist: Shinya Yamanaka
Shinya Yamanaka is a Japanese stem cell researcher who won the 2012 Nobel Prize in Physiology or Medicine for a revolutionary discovery: he found that you can reverse cell specialization! Using just four specific genes, Yamanaka showed he could take a fully specialized adult cell (like a skin cell) and "reprogram" it back into a stem cell - an unspecialized cell capable of becoming ANY cell type.
The Discovery: Scientists used to think cell specialization was permanent - once a cell became a nerve cell, it could never become a muscle cell. Yamanaka proved this wrong! He identified four "reprogramming factors" that, when activated, could erase a cell's specialization. These induced pluripotent stem cells (iPSCs) can then be instructed to become any cell type needed. This means a skin cell from a patient could become a heart cell, liver cell, or brain cell to replace damaged tissue!
Why This Matters: Yamanaka's work has opened revolutionary doors for medicine. Imagine growing replacement organs from a patient's own cells to fix damaged hearts, livers, or brains - without the risk of rejection! This is tissue engineering. His work also helps researchers understand HOW gene expression controls specialization, which directly connects to Week 2 concepts. Scientists are now using iPSCs to test new medicines and understand genetic diseases. This is one of the most promising areas in modern medicine!
Connection to Grade 7: This week, you learned that different genes are turned "on" to create specialized cells. Yamanaka showed that if you turn the RIGHT genes back "on," you can undo specialization! His work proves that gene expression truly controls cell identity, and that understanding this process could revolutionize medicine.
"I believe that scientific research is essential for the progress of medicine and human health. Stem cells offer hope for many diseases." - Shinya Yamanaka
Science in St. Louis: Regenerative Medicine
Washington University Medical Center leads regenerative medicine research. Scientists at WashU, BJC HealthCare, and St. Louis Children's Hospital engineer replacement tissues using stem cellsβheart valves, cartilage, and 3D-bioprinted organs. This cutting-edge work creates local jobs for tissue engineers and biomedical researchers working on cell specialization concepts you're learning today.
Equity Challenge: Access to Regenerative Medicine
Tissue-engineered organs cost thousands to millions of dollars, making them accessible primarily to wealthy patients. Communities with lower incomes lack access to these treatments. St. Louis researchers are working to make regenerative medicine more affordable and accessibleβaddressing both the science and justice of healthcare innovation.
Building on Week 1
Last week you learned that ALL cells have the same basic structures (cell membrane, cytoplasm, nucleus). This week you'll discover how cells with the SAME DNA become specialized for different jobs!
| Week 1 Concept | Week 2 Extension |
|---|---|
| All cells have organelles | Specialized cells have MORE of certain organelles |
| Basic cell structures | Specialized structures for specialized jobs |
| Plant vs animal cells | 200+ types of specialized human cells! |
Interactive Simulation: Gene Expression Essentials
How to Use This Simulation:
- Click the "Expression" tab at the top of the simulation
- Watch how genes turn ON and OFF to create different proteins
- Observe the transcription process: DNA β mRNA β Protein
- Try adding "positive transcription factor" - see how it activates the gene!
- Notice: Same DNA can make different proteins by turning different genes on/off
- Connect to cell specialization: This is HOW cells with identical DNA become different cell types!
Need help getting started with the simulation?
If the simulation won't load:
- Try refreshing your browser (Ctrl+R or Cmd+R)
- Make sure you're connected to Wi-Fi
- Ask Mr. Rosche for help if it still doesn't work
What to observe:
- Gene = section of DNA that codes for ONE protein
- Transcription factors turn genes ON or OFF like light switches
- Different proteins = different cell structures and functions
- This explains why a neuron looks/acts different from a muscle cell - different genes are ON!
Need extra support? Click here for hints and sentence starters
Structure-Function Connections:
- Long shape = good for carrying signals or contracting
- Flat/disc shape = more surface area for absorption/exchange
- Lots of mitochondria = needs lots of energy
- Large storage area = stores materials (like fat or water)
Sentence Starters:
- "The neuron's long extensions help it..."
- "Red blood cells don't need a nucleus because..."
- "Muscle cells have many mitochondria because..."
- "Structure matches function when..."
Word Bank:
surface area, energy, ATP, oxygen, hemoglobin, axon, signal, contract, protection, absorption
Stuck? Click here for step-by-step help
Try these steps in order:
- Pick ONE cell type (like neurons)
- Look at its SHAPE - is it long? round? flat?
- Look at its SPECIAL PARTS - does it have extensions? extra organelles?
- Think about its JOB - what does this cell DO?
- Connect: How does the shape/parts help it do its job?
- Watch: Search "Specialized Cells"
COMPLETE THE STATION 1 FORM BELOW
Analyze specialized cells and connect structure to function.
[EMBED G7.C1.W2 Station 1 Form Here]
Form ID: ________________
Learning Support Tracker
I do + You watch
We do together
You do + I check
Guided Practice (You Fill In):
"First, I notice _____ [you identify the specialized structure]. The evidence from the simulation is _____ [you describe what you observed]. This connects to CCC: Structure & Function because _____ [you explain the relationship]."
Use the 5-step process from Week 1:
- Read the scenario carefully
- Identify the cell structure involved
- Connect structure to function
- Find evidence in the simulation
- Explain with CCC connection
Station 2 - Tissue Organization
20 Points | ~15 Minutes
Your Mission: Learn How Cells Organize Into Body Parts
Levels of Organization (Smallest to Largest):
Example: Muscle cell β Muscle tissue β Heart (organ) β Circulatory system β You!
Four Main Tissue Types in Your Body:
| Tissue Type | Function | Examples |
|---|---|---|
| Epithelial | Covers & lines surfaces | Skin, mouth lining, intestine lining |
| Connective | Supports & connects | Bone, blood, tendons, fat |
| Muscle | Movement | Heart muscle, arm muscles, stomach muscles |
| Nervous | Communication (signals) | Brain, spinal cord, nerves |
Key Concept: Organs Contain Multiple Tissue Types
Your HEART (an organ) contains:
- Muscle tissue - to pump blood
- Nervous tissue - to control heart rate
- Connective tissue - for structure and support
- Epithelial tissue - lining blood vessels
Organs need DIFFERENT tissue types working TOGETHER!
Need extra support? Click here for memory tricks
Memory Tricks for Tissue Types:
- Epithelial = "Epi" means "on top of" - it COVERS things!
- Connective = It CONNECTS and supports (like bones connect to muscles)
- Muscle = Think "muscular" - for MOVEMENT
- Nervous = Your "nerves" - for COMMUNICATION/signals
Organization Reminder:
Tissue = Similar cells working together
Organ = Different tissues working together
System = Different organs working together
Sentence Starters:
- "Cells organize into tissues when..."
- "An organ needs multiple tissue types because..."
- "The heart contains muscle tissue for ___ and nervous tissue for ___"
COMPLETE THE STATION 2 FORM BELOW
Learn the organization hierarchy and tissue types.
[EMBED G7.C1.W2 Station 2 Form Here]
Form ID: ________________
Station 3 - Design a Specialized Cell
25 Points | ~20 Minutes (Highest Value!)
Engineering Challenge: Be a Cell Designer!
Your Challenge:
Design a specialized cell for a specific job in the body. Choose ONE:
- Option A: A cell that absorbs nutrients from food (intestine)
- Option B: A cell that detects light (eye/retina)
- Option C: A cell that produces a hormone (gland - like insulin from pancreas)
- Option D: A cell that fights bacteria (immune system - white blood cell)
Your design must explain HOW the structure helps the function!
Design Requirements:
- Choose your cell's job and list what it needs to DO (at least 3 requirements)
- Design the SHAPE - explain WHY this shape helps
- Choose ORGANELLES - which ones would your cell need MORE of? Why?
- Add SPECIAL FEATURES - what unique structure would help it do its job?
- Identify LIMITATIONS - what can't your design show about real cells?
Example: Intestinal Absorption Cell
- Job: Absorb nutrients from digested food
- Shape: Tall column with finger-like projections (villi) on top - increases surface area for absorption!
- Extra Organelles: Lots of mitochondria - needs energy to actively transport nutrients
- Special Feature: Microvilli (tiny finger-like bumps) increase surface area even more
- Limitation: My design doesn't show how signals tell the cell what to absorb
Need extra support? Click here for design tips
Design Process:
- Start with the JOB - what does this cell need to DO?
- Think about CHALLENGES - what makes this job hard?
- Design SOLUTIONS - what structure/shape would help?
- Remember: Structure MUST match function!
Common Structure-Function Solutions:
- Need to absorb/detect? β Increase surface area (flat or with projections)
- Need lots of energy? β Many mitochondria
- Need to make proteins? β Many ribosomes
- Need to send signals far? β Long extensions
- Need to move/squeeze? β Flexible shape, contractile fibers
Sentence Starters:
- "I chose _____ because this cell needs to..."
- "The shape helps by..."
- "This cell would need many _____ organelles because..."
- "One limitation is that my design doesn't show..."
COMPLETE THE STATION 3 FORM BELOW
Design your specialized cell with structure matching function!
[EMBED G7.C1.W2 Station 3 Form Here]
Form ID: ________________
Exit Ticket - Specialization Integration
23 Points | ~15 Minutes
Show What You Learned
Question Types:
- 3 NEW - Gene expression, structure-function, organization levels
- 1 SPIRAL (Week 1) - Organelle function review
- 1 INTEGRATION - Connect organelles to whole cell specialization
- 1 SEP-1 - Generate scientific questions about specialization
Total: 6 questions, 23 points
Remember:
This week introduced SPIRAL questions! You'll have one question reviewing Week 1 cell structures. Starting next week (Week 3), you'll review content from BOTH previous weeks.
COMPLETE THE EXIT TICKET BELOW
This is your final assessment for Week 2. Take your time!
[EMBED G7.C1.W2 Exit Ticket Form Here]
Form ID: ________________
Enrichment & Extension
Optional deep dives for early finishers.
Optional content if you finish early or want to go deeper.
Scientist Spotlight
Research a scientist who contributed to this week's topic area and describe their key findings.
Environmental Justice Connection
Explore how this week's science concepts connect to environmental justice issues in our community.