Analyze tox results
Do now
Interpret biomolecule and toxicology data with a CER and assess method limitations.
- Hand in
- CER stating which biomolecules are present in each unknown, using Wednesday's data table as evidence and citing comparison to positive and negative controls in the reasoning.
- 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.
Looking at your data from Wednesday, which unknowns are truly positive when you hold them against your controls, and does your toxicology dilution data show that more concentration really caused more effect?
Interpret and toxicology data with a CER and assess method limitations.
- • I can interpret indicator results against controls.
- • I can describe a dose-response trend and its limits.
- How do you decide an unknown is really positive and not just showing the reagent's own color?
- In your toxicology data, what happened to the effect as the concentration went up?
- 1Compare unknown-sample results to your control results.
- 2Write a CER: which biomolecules are present in each unknown?
- 3Analyze the dose-response trend in your toxicology dilution data.
- 4Identify two variables that could produce a .
- 5State one limitation of indicator tests for conclusions.
What did this day actually feel like?
Analyze tox results
We compared unknowns against our controls and wrote a CER on which biomolecules are present in each. Then the toxicology piece, which was a dilution series showing dose response. Same substance, increasing concentration, and you can watch the effect climb.
The idea underneath is that the dose makes the poison. Almost anything is harmless at a low enough concentration and dangerous at a high enough one. That reframed a lot for me, because I had been thinking of chemicals as either safe or not safe.
AT HOME, THE WEEKEND BEFORE MON SEP 21 Submit evidence data Packet day. Data table with controls, dose response description, CER, limitations. The limitations section is now a required part of everything we hand in, and I have stopped resenting it. Writing "my negative control was clean so I trust these results" is a sentence that means something.
Turned in: full week packet → recorded in Class Records
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 dose makes the poison. Almost anything is harmless at a low enough concentration. I had been sorting chemicals into safe and not safe.
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 result becomes evidence only when compared against controls because a color change in can come from interference or , so interpretation depends on the comparison, not the color.
- 0:00Return Wednesday data tables; identify any groups whose showed a color change (class discussion of what that means)
- 0:12Walk through interpretation logic: matched, flat, unknown matches positive = positive result
- 0:25Students interpret their unknown results, noting biomolecules present or absent for each sample
- 0:40Analyze dilution series: describe the dose-response trend in words; identify threshold if visible
- 0:55CER writing: claim (which biomolecules present), evidence (), reasoning (comparison to controls)
- 1:10List two false-positive sources and one limitation of indicator tests; preview Friday submission
- • Your data from Wednesday is only half the story. Today we interpret it. And interpreting data means comparing your unknowns to your controls, not just reading a color.
- • If your changed color too, that is a problem. It tells you something went wrong with your technique or your reagent, and your unknown results may not be valid.
- • We will also look at your dilution series and describe the dose-response relationship. In toxicology, this relationship is the foundation of every limit ever set, from drinking-water standards to medication dosing.
- • Your CER today is your scientific argument about what biomolecules are in each unknown. Evidence comes from the ; reasoning comes from the comparison to controls.
- • An unknown result is interpreted as positive only if it matches the and differs from the .
- • A dose-response relationship shows that as concentration increases, the measured effect increases; a threshold is the concentration below which no measurable effect appears.
- • Common sources of false positives in indicator tests include cross- between tubes, using the wrong reagent concentration, and interference from pigments in the sample.
Unit 1.1 to 1.2: Experimental design in evidence testing; transition to autopsy evidence and biomolecules. · Analyze tox results
Day 4 of this lesson. Open this exact section in myPLTW (find it in Clever, Microsoft sign-in), then do the work below.
Do this: In myPLTW, complete the Lesson 1.1 Investigating the Scene evidence-testing analysis section by entering your interpreted results and the dose-response description.
Mark the Lesson 1.1 analysis section complete in myPLTW.
You collected data Wednesday. By the end of today your CER and dose-response description should both be done.
Completed myPLTW Lesson 1.1 analysis entry and written CER with controls-based interpretation.
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.
Unit 1.1 to 1.2: Experimental design in evidence testing; transition to autopsy evidence and biomolecules. · Analyze tox results
In myPLTW, complete the Lesson 1.1 Investigating the Scene evidence-testing analysis section by entering your interpreted results and the dose-response description.
You collected data Wednesday. By the end of today your CER and dose-response description should both be done.
This is how Mr. Mendoza sees the class keeping pace with PLTW. Be honest, it only helps if it is accurate.
🎯 Interpret and toxicology data with a CER and assess method limitations.
- Compare unknown-sample results to your control results.
- Write a CER: which biomolecules are present in each unknown?
- Analyze the dose-response trend in your toxicology dilution data.
- Identify two variables that could produce a .
- State one limitation of indicator tests for conclusions.
CER: CER stating which biomolecules are present in each unknown, using Wednesday's as evidence and citing comparison to positive and negative controls in the reasoning.
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 |
|---|---|
| Compare unknown-sample results to your control results. | _______ |
| Write a CER: which biomolecules are present in each unknown? | _______ |
| Analyze the dose-response trend in your toxicology dilution data. | _______ |
| Identify two variables that could produce a . | _______ |
| State one limitation of indicator tests for conclusions. | _______ |
Working solo? Put your own name in "Who" for every row.
- I can interpret indicator results against controls.
- I can describe a dose-response trend and its limits.
- 1Do thisInterpret biomolecule and toxicology data with a CER and assess method limitations.
- 2Use this resource
- 3Submit thisCER: CER stating which biomolecules are present in each unknown, using Wednesday's data table as evidence and citing comparison to positive and negative controls in the reasoning.
- 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. Principles of Biomedical Technology (Principles of Biomedical Science) › Unit 1.1 to 1.2: Experimental design in evidence testing; transition to autopsy evidence and biomolecules. › CEROpen 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.
Indicator tests produce valid evidence only when positive and negative controls confirm the reagents work, so cross- must be prevented because a is invisible without controls.
A result becomes evidence only when compared against controls because a color change in can come from interference or , so interpretation depends on the comparison, not the color.
A detective board holds observations, possible explanations, and one next question.
- Which notes are direct observations?
- Which notes are explanations?
- What new evidence would separate the explanations?
Keep observations separate from explanations, then collect the evidence that can distinguish the options.
Biomedical investigations use controlled procedures and validated measurements, not intuition alone.
- • Board notes map to E1-E3.
- • Possible explanations map to the decision options.
- • The next question maps to the evidence-based action.
Driving question: Looking at your data from Wednesday, which unknowns are truly positive when you hold them against your controls, and does your toxicology dilution data show that more concentration really caused more effect?
What you already know: Indicator tests produce valid evidence only when positive and negative controls confirm the reagents work, so cross- must be prevented because a is invisible without controls.
New idea: A result becomes evidence only when compared against controls because a color change in can come from interference or , so interpretation depends on the comparison, not the color.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Analyze tox results. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled observation or evidence sequence before choosing an explanation.
- Observe or measure the relevant feature in Analyze tox results.
- Organize the observation with a stable evidence ID.
- Apply this rule: Keep observations separate from explanations, then collect the evidence that can distinguish the options.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: Looking at your data from Wednesday, which unknowns are truly positive when you hold them against your controls, and does your toxicology dilution data show that more concentration really caused more effect?
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.
- • : A molecule produced by living things that carries out life's functions, including carbohydrates, lipids, proteins, and nucleic acids.
- • : A large biological molecule built from smaller units, with the four main classes being carbohydrates, lipids, proteins, and nucleic acids.
- • toxicology: The science of how chemicals and other substances cause harm to living things, including the dose at which they become dangerous.
- • : A group of similar cells working together to perform a shared function, such as muscle, nerve, or .
- • : A careful medical examination of a body after death to find the , study disease, and gather evidence.
- • : The specific injury or disease that directly led to a person dying, such as a heart attack or massive blood loss.
- • : The classification of how a death came about, falling into categories such as natural, accident, suicide, homicide, or undetermined.
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.
An unknown result is interpreted as positive only if it matches the and differs from the .
Limit: E1 supplies context or an observation; it does not by itself establish the explanation.
A result becomes evidence only when compared against controls because a color change in can come from interference or , so interpretation depends on the comparison, not the color.
Limit: E2 is a teaching statement or comparison and must be checked against the task evidence.
I can interpret indicator results against controls.
Limit: E3 supports only the result or product criterion named here; it cannot justify a broader clinical or causal claim.
PLTW-PBT-2026-09-18 · Simulated classroom evidence scenario
Your role: biomedical investigator
Decision: Your team must decide what the evidence from Analyze tox results supports before submitting the claim-evidence-reasoning 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 claim-evidence-reasoning response.
Claim ceiling: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Analyze tox results. 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 Analyze tox results supports before submitting the claim-evidence-reasoning response named on the lesson page.
Context: A result means nothing on its own; it becomes evidence only when you compare it to controls and account for what could have faked it, because interpretation, not observation, is where science happens.
- • T1: Compare unknown-sample results to your control results.
- • T2: Write a CER: which biomolecules are present in each unknown?
- • T3: Analyze the dose-response trend in your toxicology dilution data.
- • T4: Identify two variables that could produce a .
- • T5: State one limitation of indicator tests for conclusions.
- • E1: An unknown result is interpreted as positive only if it matches the and differs from the .
- • E2: A result becomes evidence only when compared against controls because a color change in can come from interference or , so interpretation depends on the comparison, not the color.
- • E3: I can interpret indicator results against controls.
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 Analyze tox results. Trace the labeled observation or evidence sequence before choosing an explanation. 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.
= final volume / sample volume. New concentration = starting concentration / dilution factor.
Mix 1 mL of sample to a final volume of 10 mL. The is 10. A 100 mg/mL starting sample becomes 10 mg/mL.
Use the same volume units before dividing. Concentration keeps its original concentration unit.
Apply the same setup to one supplied dilution or dose. Show the factor, new value, units, and a reasonableness check.
Students often think Students think a dose-response means any dose causes an effect, so they assume even the smallest concentration must do something measurable.. The trap: That is a trap because most dose-response relationships have a threshold, a concentration below which no effect appears; the effect rises with dose only above that threshold, so low concentrations can read as zero and still be part of the trend.
Claim: Water Sample B is contaminated with coliform bacteria.\nEvidence: On the coliform indicator plate, Sample B produced pink colonies with a metallic sheen, matching the positive control that was inoculated with a known coliform strain, while the negative control plate (sterile buffer) stayed clear with no colonies. In the dilution series, the undiluted sample grew a dense lawn, the 1:10 dilution grew about 40 colonies, and the 1:100 dilution grew about 5 colonies.\nReasoning: A plate counts as positive only if it matches the positive control and differs from the negative control, and Sample B did both, so the pink metallic colonies are evidence of coliforms rather than a stray color. The steady drop in colony count as the sample was diluted is a dose-response pattern, which shows the colonies came from bacteria carried in the sample and not from contamination introduced during plating. Together the control comparison and the dilution trend make the positive reading trustworthy.\nLimitation: This indicator plate confirms that coliform bacteria are present but does not identify the exact species or prove the water is unsafe to drink, so it cannot stand alone as a public-health conclusion and would need a confirmatory test.
This model shows the level of evidence and organization needed to complete: A claim-evidence-reasoning paragraph interpreting an indicator-plate result against controls, using the data table as evidence and citing the dose-response pattern, with a stated method limitation.
- Write one defensible claim.
- Choose specific evidence that supports the claim.
- Explain the scientific rule that connects the evidence to the claim.
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: Upload your CER and annotated data table to the tracker by end of 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 Analyze tox results. 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.
Hand-picked readings and interactives for this lesson, from authoritative open organizations and PLTW's own public course outline.
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 Analyze tox results. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
An unknown and the negative control both turn slightly orange with Benedict's, while the positive control turns deep orange. Is the unknown positive for sugar? Explain.
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.
Today is individual work you can do from home: complete the same target above, then submit your CER.
Open the drop folderTurn 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.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
Khan Academy: macromolecules- 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.