Purification overview
Do now
Explain why a manufactured protein must be purified and what purity means for a medicine.
- Hand in
- Short exit ticket defining purity and identifying one concrete safety risk of an impure protein medicine.
- Where
- Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
You get two school days for every day you were absent, so this deadline moves with you.
If a batch of comes out of bacteria mixed with thousands of other bacterial proteins, DNA, and cell membrane pieces, what has to be removed before a person can inject it, and why?
Explain why a manufactured must be purified and what means for a medicine.
- • You'll be able to explain why a medicine must be purified.
- • You'll be able to define and a risk of impurity.
- When bacteria are grown to make a human , name two things besides the target protein that end up in the mixture when the cells are broken open.
- Why might a patient's body react badly to a medicine that still has bacterial leftovers in it?
- 1Read the overview notes in the PLTW course shell and define .
- 2List what else is in the cell mixture besides the target .
- 3Explain why an impure medicine could be unsafe.
- 4Preview the steps you will model this week.
- 5Submit a short exit ticket defining and one risk of impurity.
What did this day actually feel like?
Purification overview
ETHICS DAY The problem is separating one protein from thousands of others in the same tube, using whatever makes yours different: size, charge, or what it sticks to.
AT HOME, THE NIGHT BEFORE WED DEC 2 GFP and chromatography Green fluorescent protein, which is the perfect teaching molecule because you can literally see where it is.
Purification stops being abstract when the fraction you want glows.
Turned in: notebook → Lab Notebooks folder
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
The same day, drawn.
The problem is separating one protein from thousands of others in the same tube, using whatever makes yours different: size, charge, or what it sticks to.
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
🛠 Get unstuck · pick your level
🔑 Today's words · 5
Tap a word in the lesson for a plain meaning and one example. Recycled into next week's Do-Now.
Do the work · 80-minute blockfirst 5 min = hook▸
💡 Big idea: A manufactured must be purified because every contaminant left in the mixture gets injected into the patient and can trigger an immune reaction or weaken the drug.
- 0-10Read overview; define in own words
- 10-25List cell-lysate components besides target
- 25-42Explain risk of each contaminant type
- 42-58Preview this week's steps (, SDS-PAGE)
- 58-70Write exit ticket: definition and one impurity risk
- 70-80Submit exit ticket; preview Tuesday diagram
- • Your bacteria made the recombinant , but it is swimming in a soup of thousands of other molecules.
- • Before it can enter a patient, everything else has to be removed.
- • Today you learn what is in that soup and why impurity is not just a quality problem but a problem.
- • and QC connect to the Lab SOPs domain of the 072130 WebXam.
- • Cell lysate contains the target mixed with thousands of other bacterial proteins, DNA, and membrane fragments.
- • Contaminants in a therapeutic can provoke dangerous immune responses in patients.
- • is quantified by the ratio of target to total protein, often confirmed by gel analysis.
GFP, chromatography, SDS-PAGE / gel interpretation, purity and QC. · overview
Day 1 of this lesson. Open this exact section in myPLTW (find it in Clever, Microsoft sign-in), then do the work below.
Do this: Open the - unit tracker in myPLTW for Activity 4.1.3 GFP Protein Purification and read the purification overview notes.
Mark the -overview entry complete and attach your exit ticket.
Cloning unit should be fully closed; this overview opens the - unit.
Exit ticket defining and one impurity risk submitted to the class site.
The official PLTW activity stays inside myPLTW. If myPLTW will not open, use F1 and E1-E3 on this page to complete today's local evidence decision, then make up the official activity when access returns. Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
Check things off as you work, then submit. This tells Mr. Mendoza how you're doing so he can help the class. It does not replace turning in your producible through the submission route shown below.
Use the code Mr. Mendoza gave you, not your name. Saved on this device.
GFP, chromatography, SDS-PAGE / gel interpretation, purity and QC. · Purification overview
Open the - unit tracker in myPLTW for Activity 4.1.3 GFP Protein Purification and read the purification overview notes.
Cloning unit should be fully closed; this overview opens the - unit.
This is how Mr. Mendoza sees the class keeping pace with PLTW. Be honest, it only helps if it is accurate.
🎯 Explain why a manufactured must be purified and what means for a medicine.
- Read the overview notes in the PLTW course shell and define .
- List what else is in the cell mixture besides the target .
- Explain why an impure medicine could be unsafe.
- Preview the steps you will model this week.
- Submit a short exit ticket defining and one risk of impurity.
Exit ticket: Short exit ticket defining and identifying one concrete risk of an impure medicine.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Use the checklist just below and upload by 11:29 PM for full credit. Absent with an excused absence? You get two school days for every day you were absent, so this deadline moves with you.
| Task | Who |
|---|---|
| Read the overview notes in the PLTW course shell and define . | _______ |
| List what else is in the cell mixture besides the target . | _______ |
| Explain why an impure medicine could be unsafe. | _______ |
| Preview the steps you will model this week. | _______ |
| Submit a short exit ticket defining and one risk of impurity. | _______ |
Working solo? Put your own name in "Who" for every row.
- You'll be able to explain why a medicine must be purified.
- You'll be able to define and a risk of impurity.
- 1Do thisExplain why a manufactured protein must be purified and what purity means for a medicine.
- 2Use this resource
- 3Submit thisExit ticket: Short exit ticket defining purity and identifying one concrete safety risk of an impure protein medicine.
- 4Submit it here
- 1Open the drop folder.
- 2Sign in with your district Microsoft account, not a personal one.
- 3Upload the file, named Lastname_Firstname__Assignment Title.
- 4Your own upload panel says Uploaded with a green check: that is your receipt.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Genetics of Disease (Medical Interventions) › GFP, chromatography, SDS-PAGE / gel interpretation, purity and QC. › Exit ticketOpen the drop folder
Learn it · deck, reading, and vocabulary▸
The deck carries the prior idea forward, lets you inspect an analogy, maps the rule to biology, and ends with the same evidence decision and exit ticket used on this page.
Generated from this lesson's canonical data with a red-team citation check.
An inserted gene only yields after the cell transcribes and translates it, so growth conditions that speed or slow those steps become control points that decide how much protein you get.
A manufactured must be purified because every contaminant left in the mixture gets injected into the patient and can trigger an immune reaction or weaken the drug.
A library keeps a master plan protected while working copies guide production at different stations.
- Why protect the master copy?
- What information moves?
- Where can an error change the final product?
Stored information can be copied, read, and converted into a functional product.
Genes are regulated biological sequences, not conscious instructions, and one gene rarely determines a whole trait alone.
- • Master plan maps to DNA.
- • Working copy maps to RNA.
- • Production output maps to or a regulated cell function.
Driving question: If a batch of comes out of bacteria mixed with thousands of other bacterial proteins, DNA, and cell membrane pieces, what has to be removed before a person can inject it, and why?
What you already know: An inserted gene only yields after the cell transcribes and translates it, so growth conditions that speed or slow those steps become control points that decide how much protein you get.
New idea: A manufactured must be purified because every contaminant left in the mixture gets injected into the patient and can trigger an immune reaction or weaken the drug.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Purification overview. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled testing, treatment, or biological process and identify where evidence limits the decision.
- Observe or measure the relevant feature in overview.
- Organize the observation with a stable evidence ID.
- Apply this rule: Stored information can be copied, read, and converted into a functional product.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: If a batch of comes out of bacteria mixed with thousands of other bacterial proteins, DNA, and cell membrane pieces, what has to be removed before a person can inject it, and why?
What the evidence supports: E1-E3 and F1 support the daily take-home when the response meets the stated success criteria.
What it cannot prove: The package does not support claims beyond this lesson's or any real patient diagnosis.
- • GFP: Green fluorescent , taken from a jellyfish, that glows green under blue or ultraviolet light and is used to tag and watch cells or genes.
- • : A lab technique that separates a mixture into its parts based on how fast each component travels through a material like paper or a gel.
- • : The step in a separation method where a solvent washes the target molecule off a column or material so it can be collected in pure form.
- • : A specific whose presence signals a particular cell type, disease, or biological state, used to identify or track it.
- • : How free a sample is from contaminating substances, often given as the percentage of the sample that is the intended compound.
- • QC: Quality control, the routine checks and known samples used in a lab to confirm tests and instruments are working correctly and giving reliable results.
Use it now: Choose one decision option. Cite E1 and E3, then explain how the rule connects the evidence to your choice.
Go further, optional: The source links below are optional enrichment. Every fact required for today's local evidence decision appears in this lesson package.
Cell lysate contains the target mixed with thousands of other bacterial proteins, DNA, and membrane fragments.
Limit: E1 supplies context or an observation; it does not by itself establish the explanation.
A manufactured must be purified because every contaminant left in the mixture gets injected into the patient and can trigger an immune reaction or weaken the drug.
Limit: E2 is a teaching statement or comparison and must be checked against the task evidence.
You'll be able to explain why a medicine must be purified.
Limit: E3 supports only the result or product criterion named here; it cannot justify a broader clinical or causal claim.
PLTW-GEND-2026-12-01 · Simulated classroom evidence scenario
Your role: medical interventions team member
Decision: Your team must decide what the evidence from overview supports before submitting the exit response named on the lesson page.
- • Select the option best supported by E1-E3.
- • Select a reasonable alternative and name the evidence it would require.
- • Delay the claim because the evidence does not distinguish the options.
Response: State one choice, cite at least two evidence IDs, explain the rule that connects them, and add one limitation. Submit it as the exit response.
Claim ceiling: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about overview. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Reason for review: Your team must decide what the evidence from overview supports before submitting the exit response named on the lesson page.
Context: A medicine is only as safe as it is pure, because whatever rides along with the target protein gets injected into the patient too.
- • T1: Read the overview notes in the PLTW course shell and define .
- • T2: List what else is in the cell mixture besides the target .
- • T3: Explain why an impure medicine could be unsafe.
- • T4: Preview the steps you will model this week.
- • T5: Submit a short exit ticket defining and one risk of impurity.
- • E1: Cell lysate contains the target mixed with thousands of other bacterial proteins, DNA, and membrane fragments.
- • E2: A manufactured must be purified because every contaminant left in the mixture gets injected into the patient and can trigger an immune reaction or weaken the drug.
- • E3: You'll be able to explain why a medicine must be purified.
Measurements: Use only the measurements, units, graph, or counts supplied in today's task. No additional patient measurement is implied.
Figure finding: Teaching diagram for overview. Trace the labeled testing, treatment, or biological process and identify where evidence limits the decision. This is a teaching model, not patient or experimental data.
Uncertainty: This is a composite classroom scenario. Missing history, measurements, or confirmation tests remain unknown and limit the conclusion.
Mean = sum of values / number of values. Median = middle ordered value. Range = maximum - minimum.
For 2, 4, 4, and 10: mean = 20 / 4 = 5, median = 4, and range = 10 - 2 = 8.
Mean, median, and range keep the measurement unit. Order the values before finding the median.
Calculate the requested summary for today's supplied values, then write what it reveals and what it hides.
Students often think Students assume that if bacteria were engineered to make the target , the protein comes out clean because that is what the cells were told to produce.. The trap: The engineered is a tiny fraction of everything inside the cell. Breaking the cells open releases all of the bacterium's own proteins, DNA, and membranes at the same time, so the target starts out badly outnumbered and must be separated, not just harvested.
Definition of purity: purity is how much of the total protein in my sample is actually the target protein, rather than other proteins and cell parts. High purity means almost all of it is the protein I want.
What else is in the mixture: besides my target protein, the cell lysate contains thousands of other bacterial proteins, DNA, and broken membrane fragments.
One safety risk of impurity: if a protein medicine still contains bacterial contaminants, those contaminants can trigger a dangerous immune reaction in the patient, so an impure dose is not just less effective, it can be unsafe.
This model shows the level of evidence and organization needed to complete: Completes the purification overview: a short exit ticket defining purity and naming one concrete safety risk of an impure protein medicine.
- Name the prompt or task.
- Answer it directly with the key evidence.
- Check that the response matches the requested format.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Submit your exit ticket to the class site before leaving class.
- CER:
- Claim, Evidence, Reasoning: make a claim, back it with evidence, explain your reasoning.
- SOP:
- Standard Operating Procedure, the exact steps to follow (especially in a lab).
- Tracker:
- Your PLTW progress log where you record completed evidence.
- myPLTW:
- The PLTW course site where you do the online activities. Find it in Clever with your Microsoft sign-in, right next to Schoology.
Tap the speaker to hear a term. Add two of these to your notebook glossary with a definition and an example in your own words.
Pick just 2 or 3 words from today and make them yours: write what each one means in your own words, name the context clue or evidence that helped, then give one example from what you actually did in Purification overview. Try your own words first; the glossary is there if you get stuck. This is voluntary and counts as extra credit, so keep it short.
Saved on this device. Show Mr. Mendoza or add these to your notebook glossary to claim the extra credit.
Classroom documents for this lesson are posted in Schoology. Open Clever, then Schoology, and find each one by the name shown on its card.
Open this when the class reaches this activity and use it to complete the required lesson artifact.
Placement rationale
Matched and quality control by path:Medical-Interventions/Unit-4_When-Organs-Fail/4.1_Manufacturing-Human-Proteins; keywords:protein purification, gfp, . Score 150. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Open this when the class reaches this activity and use it to complete the required lesson artifact.
Placement rationale
Matched and quality control by path:Medical-Interventions/Unit-4_When-Organs-Fail/4.1_Manufacturing-Human-Proteins; keywords:protein purification, gfp, . Score 150. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Use this if you were absent, got stuck, or need another pass before you submit the lesson artifact.
Placement rationale
Matched and quality control by path:Medical-Interventions/Unit-4_When-Organs-Fail/4.1_Manufacturing-Human-Proteins; keywords:gfp, . Score 142. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
How to get there: open Clever and sign in with your Microsoft (district) account. Both myPLTW and Schoology are in Clever. Do the activity in myPLTW. Turn the work in on this site or hand it to Mr. Mendoza, because that is the step that counts as submitted. Schoology only shows your report-card grade later.
Check yourself · commit, then reveal▸
Claim ceiling for this check: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about overview. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
A lab reports their protein prep is '30 percent pure.' What does that number mean, and is it ready to inject?
Write an answer and pick a confidence to unlock the key.
Fast retrieval with instant answers, not the commit-then-reveal check above. Try each from memory first: write what you remember about the earlier units, then check yourself here.
Go further and get help▸
What today's skills lead to. These are real health-science careers this course builds toward. Tap one to see, on the US Department of Labor's O*NET site, what the job actually involves, what it pays, and how fast it is growing.
The bench work needs equipment you do not have at home. Do the thinking half now: read the procedure, write your prediction, and set up your data table so it is ready.
Back in class. Ask Mr. Mendoza for the class data set, or for a bench slot to run it yourself. Do not submit a Exit ticket with invented numbers.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
Genetic Science Learning Center: Genetics basics and proteinsYou've passed Unit 2, so the optional extra-credit track is open. Complete reserved-unit work from home, including virtual labs, for extra credit. Each item shows its correct submission route.
Open the extra-credit track- CompleteEvery required part of the artifact is present, nothing left blank.
- AccurateThe science and the data are correct and match the evidence.
- Scientific reasoningYou explain your claim with evidence and reasoning (CER), not just an answer.
- Professional communicationClear, organized, labeled, and written the way a clinician or scientist would.
- SubmittedTurned in the right way, on the class site or handed to Mr. Mendoza in class, and confirmed. Not in Schoology: that is where the report-card grade appears later.