Workflow notes and controls
Open your materials, follow the steps, then turn in your work.
Outline the recombinant DNA workflow and explain the rationale for each control.
1. Open your materials
Use the materials named in the first step below. Open lesson resources.
2. Start the work
List the workflow steps: cut, ligate, transform, select.
Show all 5 required steps
- List the workflow steps: cut, ligate, transform, select.
- For each step, name the enzyme or reagent used.
- Explain why restriction enzymes cut at specific sequences.
- Identify a positive and a negative control for the experiment.
- Write the safety reason each control is included.
Lost your place? Lost your place? Your notes should list the four steps (cut, ligate, transform, select) with an enzyme or reagent named for each. If you stalled, jump to naming a positive and a negative control, then write the safety reason each control is included.
Check your work before submitting
- You ordered the recombinant DNA workflow correctly.
- You justified a positive and a negative control.
Before lab work: read the safety rules
- No wet chemicals today; this is a notes and diagram session.
- If using physical model components, handle small pieces carefully to avoid choking hazard for younger students in adjacent rooms.
- Keep workspace organized; loose paper fragments from cut-out diagrams should be collected before leaving.
3. Turn in your work
DueCheck Schoology- Hand in
- Recombinant DNA workflow outline with four ordered steps, named enzyme or reagent for each, restriction enzyme specificity explanation, and positive/negative control identification with safety rationale.
How to submit and name your file
Use the submission route shown on today's today's page.
In Schoology, open your course and the assignment for this lesson. Attach your file, select Submit, and check that it appears in the submission.
PDF upload helpYou get two school days for every day you were absent, so this deadline moves with you.
How this lesson connects
Keep using what you learned last class: Genetic engineering can produce medicines we could not otherwise afford or make safely, so its use must be judged by weighing that benefit against the probability and severity of a biosafety failure. Today: Each recombinant DNA step uses a sequence-specific enzyme or reagent so that the insert and vector join correctly, and controls are built in so that you can verify the outcome instead of assuming it.
Optional: listen or watch a unit review▸
Need help? Warm-up, timing, and directions▸
💡 Big idea: Each recombinant DNA step uses a sequence-specific or reagent so that the insert and vector join correctly, and controls are built in so that you can verify the outcome instead of assuming it.
- 0-5 minWarm-up: what does a actually do to DNA?
- 5-20 minList steps and name the or reagent for each
- 20-40 minExplain specificity; sketch a sticky-end diagram
- 40-55 minIdentify positive and negative controls; write rationale for each
- 55-70 minPartner check: can your partner identify all four steps and both controls?
- 70-80 minExit ticket: name the for each step and both controls
- • Today we map the four-step molecular you'll run in a future lab.
- • Cut, ligate, transform, select: each step has a specific molecule doing a specific job.
- • We'll also nail down why controls are not optional: they're how you know your result is real.
- • By the end you'll have a complete reference and a control rationale you can defend.
- • Restriction endonucleases recognize and cut DNA at palindromic sequences, generating compatible sticky ends.
- • DNA seals the nicks between the insert and vector after .
- • selection plates distinguish transformed cells from non-transformed cells.
PLTW connection and today's work
Open Problem 6 in your myPLTW course shell and navigate to the current activity, then outline the recombinant DNA workflow and explain the rationale for each control.
Today's stopping point: The ethics debate is done; workflow notes are an early Problem 6 milestone, so check your activity guide and submit today.
PLTW activity titles identify the course connection. If your account will not open, use the posted materials for today and tell Mr. Mendoza. Do not mark an online activity complete unless you completed it.
Course connection
- Activity 6.1.1 Restriction Enzyme Challenge
Use the turn-in directions at the top of this page. Do not create a second submission unless your teacher asks for one.
Show another explanation or a smaller first step
Need help? Choose a starting point
Finish the assigned lab safely before starting extra practice.
Lesson resources: reading, slides, 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.
Genetic engineering can produce medicines we could not otherwise afford or make safely, so its use must be judged by weighing that benefit against the probability and severity of a biosafety failure.
Each recombinant DNA step uses a sequence-specific or reagent so that the insert and vector join correctly, and controls are built in so that you can verify the outcome instead of assuming it.
A research team lays out its question, variables, controls, sampling plan, measurement record, and analysis before deciding what the data support.
- Which variable is changed or compared?
- Which conditions and measurements must stay consistent?
- Which conclusion is inside the study's evidence boundary?
Define variables, controls, sampling, units, and the analysis plan before interpreting a result; analysis cannot repair biased or inconsistent measurement.
A well-organized classroom study can still be limited by , measurement quality, confounding, and the population represented.
- • Question and variable cards map to the study design.
- • Control and measurement cards map to fair, reproducible data collection.
- • The conclusion card maps to a bounded claim supported by the analysis.
Driving question: You have a human gene, an empty bacterial , and a plate of E. coli. In what order do you cut, ligate, transform, and select, and how would a plate prove which cells actually took up your gene?
What you already know: Genetic engineering can produce medicines we could not otherwise afford or make safely, so its use must be judged by weighing that benefit against the probability and severity of a biosafety failure.
New idea: Each recombinant DNA step uses a sequence-specific or reagent so that the insert and vector join correctly, and controls are built in so that you can verify the outcome instead of assuming it.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Workflow notes and controls. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled system, test, or design relationship and identify which evidence should trigger revision.
- Observe or measure the relevant feature in today's lesson.
- Organize the observation with a stable evidence ID.
- Apply this rule: Define variables, controls, sampling, units, and the analysis plan before interpreting a result; analysis cannot repair biased or inconsistent measurement.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: You have a human gene, an empty bacterial , and a plate of E. coli. In what order do you cut, ligate, transform, and select, and how would a plate prove which cells actually took up your gene?
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.
- • recombinant DNA: Use the lesson context and glossary entry to explain recombinant DNA in your own words.
- • : A bacterial that cuts DNA at a specific sequence, leaving clean or sticky ends used to splice genes together.
- • : An that joins two pieces of DNA together by sealing the gap in their backbone, vital in genetic engineering.
- • : A small, circular piece of DNA that lives apart from a bacterium's main and is used in the lab to carry a chosen gene into a cell.
- • : A bacterial cell treated so its membrane can take up foreign DNA from its surroundings, a key step in genetic engineering.
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.
Molecular workflows use controls and complementary separation or detection steps to evaluate a target, while each band, fraction, or remains limited by method resolution and sample quality.
Limit: A band, selected , or fluorescent fraction alone does not prove identity, , correct sequence, biological activity, or clinical suitability.
Define variables, controls, sampling, units, and the analysis plan before interpreting a result; analysis cannot repair biased or inconsistent measurement.
Limit: A well-organized classroom study can still be limited by , measurement quality, confounding, and the population represented.
You ordered the recombinant DNA correctly.
Limit: E3 defines the classroom product or success criterion. It is not independent scientific evidence and cannot justify a clinical or causal claim.
PLTW-BFH-2027-05-03 · Simulated classroom evidence scenario
Your role: biomedical design team member
Decision: Your team must decide what the evidence from today's lesson supports before submitting the pre-lab readiness record named on today's page.
- • Cut the human gene and the wherever you need, since a slices DNA like scissors.
- • Selection alone cannot separate a that resealed empty from one carrying your gene, so this lacks a confirming step.
- • Order the steps so the cuts its own recognition site, making sticky ends that can seal.
Response: State one choice, cite at least two evidence IDs, explain the rule that connects them, and add one limitation. Submit it as the pre-lab readiness record.
Claim ceiling: Today's evidence supports a classroom claim about today's lesson. It cannot prove causation, diagnose a real patient, or justify action outside this room.
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.
- • The solution must address the stated need in today's lesson.
- • The decision must be supported by E1-E3.
- • The final product must make the success criteria visible.
- • Complete the work inside the 80-minute block.
- • Use only supplied or teacher-approved materials and evidence.
- • Do not trade , accessibility, or privacy for speed.
- • and evidence quality: must pass before scoring other criteria.
- • User need and effectiveness: highest scored criterion.
- • Time, cost, and ease of use: compare only after and effectiveness pass.
Test evidence: For each option, record the E1-E3 result that supports or fails each criterion. Do not assign a score without a named observation.
- Version or option tested
- Criterion met or missed
- Evidence ID and result
- Revision made
- Reason for the revision
- Need and user
- Criteria and constraints
- Chosen option and evidence
- Test result
- Revision and reason
Students often think Students often think a chops DNA anywhere, like scissors cutting paper wherever you press.. The trap: Restriction enzymes are sequence-specific, not random. Each recognizes one short palindromic sequence and cuts only there, which is exactly why they generate matching sticky ends on the insert and the vector so the two pieces can anneal. If the cut were random, the ends would not match and DNA would have nothing clean to seal.
Workflow, in order:
1. Cut: A restriction enzyme (for example, EcoRI) cuts both the human gene source and the plasmid vector at the same recognition site.
2. Ligate: DNA ligase seals the insert into the cut plasmid, joining the sugar-phosphate backbone.
3. Transform: Competent bacterial cells take up the recombinant plasmid during heat shock.
4. Select: Cells are plated on antibiotic agar so only those carrying the resistance plasmid survive.
Why restriction enzymes cut at specific sequences: They recognize a specific short palindromic sequence and cut only there, producing matching sticky ends so the insert and vector fit together predictably.
Controls:
- Positive control: cells given a plasmid known to carry the resistance gene; they should grow on antibiotic agar, confirming the transformation and plates worked.
- Negative control: cells given no plasmid, plated on antibiotic agar; they should NOT grow. If they do, the antibiotic failed or the plate is contaminated.
Safety reason for controls: The negative control catches contamination and confirms the antibiotic is actually killing non-transformed cells, so we do not mistakenly release or misidentify untreated bacteria.
| Step | Enzyme or reagent | Purpose |
|---|---|---|
| Cut | Restriction enzyme (EcoRI) | Cut gene and plasmid at the same site |
| Ligate | DNA ligase | Seal insert into the plasmid |
| Transform | Competent cells, heat shock | Move plasmid into bacteria |
| Select | Antibiotic agar | Keep only transformed cells |
This model shows the level of evidence and organization needed to complete: Completes the pre-lab workflow outline: four ordered recombinant DNA steps with the enzyme or reagent for each, an explanation of restriction enzyme specificity, and a positive and negative control with safety rationale.
- Identify the purpose, hazards, and required controls.
- Write the procedure in a usable order.
- Confirm materials, measurements, and waste handling before starting.
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 workflow notes on Schoology today.
- 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 Workflow notes and controls. 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 Molecular biology and cloning by path:Biomedical-Innovations/Problem-6_Molecular-Biology/00_Problem-Overview; keywords:molecular biology, recombinant dna. Score 146. 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 Molecular biology and cloning by path:Biomedical-Innovations/Problem-6_Molecular-Biology/6.1_Molecular-Biology; keywords:recombinant dna, cloning. Score 142. 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 Molecular biology and cloning by path:Biomedical-Innovations/Problem-6_Molecular-Biology/6.1_Molecular-Biology; keywords:recombinant dna, cloning. Score 142. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Sign in to Clever with your district Microsoft account to open Schoology or myPLTW. Follow today's posted steps. If myPLTW will not open, use the posted alternative and tell Mr. Mendoza. Turn in your completed work through the Schoology assignment.
Practice: try a question, then check your answer▸
Claim ceiling for this check: Today's evidence supports a classroom claim about today's lesson. It cannot prove causation, diagnose a real patient, or justify action outside this room.
After transformation you spread cells on a plate with an antibiotic. Only the plasmid carries the antibiotic-resistance gene. What does it mean if a colony grows, and why is this a control rather than just a growth step?
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.
Missed class or ready for more?▸
Run this before you touch the bench. It is built from the real lab procedure, so the decisions you make here are the ones you will make with the equipment in your hands.
I can name the procedure's purpose and the evidence I will record. I can state today's specific hazards and the control for each. If this deck does not name them, I ask Mr. Mendoza before I touch anything. My data table is ready before materials are handled.
Finish the checklist before you handle any material.
- • No wet chemicals today; this is a notes and diagram session.
- • If using physical model components, handle small pieces carefully to avoid choking hazard for younger students in adjacent rooms.
- • Keep workspace organized; loose paper fragments from cut-out diagrams should be collected before leaving.
- 1Before materials are handled, identify the purpose, variables or comparison, controls, measurement units, and stop-work condition.
- 2List the workflow steps: cut, ligate, transform, select.
- 3For each step, name the enzyme or reagent used.
- 4Explain why restriction enzymes cut at specific sequences.
- 5Identify a positive and a negative control for the experiment.
- 6Write the safety reason each control is included.
- 7Record each result in the prepared table before interpreting it. Mark missing, repeated, or invalid results truthfully.
- 8Complete the named cleanup and waste route, remove PPE safely, wash hands when required, and confirm the station is ready for the next group.
| Trial or sample ID | Independent condition | Measured result with units | Observation before interpretation | Quality-control note |
|---|---|---|---|---|
Before the procedure, predict the result and cite the rule behind the prediction.
After the procedure, compare the result with the prediction and name one limitation or source of uncertainty.
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.
Complete a virtual cloning : select a , cut and ligate the on screen, and record the predicted recombinant product.
Learn.Genetics virtual labsUse the submission route shown on today's today's page.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
Learn.Genetics (University of Utah): cloning and recombinant DNAYou'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.
- SubmittedGo to Schoology to turn this in. Submit one PDF. Put your first and last name in the document header. Name the file: FirstName LastName - Assignment Title - YYYY-MM-DD.pdf. If you cannot get in, see Mr. Mendoza. Do not skip the work.
- Error analysis and method · counts doubleName a specific limit of the method and how it moved your result, and compare what you predicted to what happened. "Human error" does not count; say what about the procedure or instrument caused it.
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