Recombinant DNA flow
Open your materials, follow the steps, then turn in your work.
Trace how recombinant DNA lets cells manufacture a useful human protein.
1. Open your materials
Use the materials named in the first step below. Open lesson resources.
2. Start the work
Opener: collect your four yeast plates from Tuesday, score what percent of each is covered, and finish the Project 3.2.2 data table before anything else.
Show all 6 required steps
- Opener: collect your four yeast plates from Tuesday, score what percent of each is covered, and finish the Project 3.2.2 data table before anything else.
- Read the recombinant-DNA notes in the PLTW course shell and define plasmid and recombinant DNA.
- Order the steps of inserting a human gene into a plasmid and into a host cell.
- Explain why a bacterial cell can read a human gene and make the protein.
- Name one medicine, such as insulin, made this way.
- Submit a labeled recombinant-DNA flow diagram as PLTW tracker evidence.
Lost your place? Lost your place? Score your four yeast plates and finish the data table first. Then order the steps of getting a human gene into a plasmid and into a host cell.
Check your work before submitting
- You'll be able to sequence the steps of making recombinant DNA.
- You'll be able to explain how a host cell manufactures a human protein.
3. Turn in your work
DueCheck Schoology- Hand in
- Labeled recombinant-DNA flow diagram showing plasmid cutting, gene insertion, host-cell transformation, and a named protein product.
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.
Find this lesson's Schoology assignments
These are existing assignments for your section. Follow the directions in the assignment you are working on; this list does not add new work. Check Schoology for each deadline.
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How this lesson connects
Keep using what you learned last class: Scarcity forces a choice between competing fairness claims, so the allocation rule a board picks determines who is harmed by it. Today: Because the genetic code is shared, inserting a human gene on a plasmid turns a host cell into a manufacturer of the human protein.
Optional: listen or watch a unit review▸
Need help? Warm-up, timing, and directions▸
💡 Big idea: Because the genetic code is shared, inserting a human gene on a turns a host cell into a manufacturer of the human .
- 0-12Plate read: collect Tuesday's four yeast plates, score percent growth on each with the grid, complete the Project 3.2.2 , then bleach and bag the plates
- 12-20Read notes; define and recombinant DNA in own words
- 20-35Order the gene- steps; compare sequence with a partner
- 35-50Explain shared genetic code; annotate why bacteria can read human genes
- 50-60Name a real medicine produced this way; add to diagram
- 60-72Finalize and label flow diagram
- 72-80Submit diagram to tracker; async post if remote
- • Before a medicine can be purified, it has to be made inside a living cell.
- • Recombinant DNA is the blueprint that tells the cell what to build.
- • Today you will diagram the full flow from human gene to medicine.
- • This process sits squarely in the Molecular and Genetic Technology domain of the WebXam.
- • A is a small circular DNA molecule used as a vector to carry a gene into a host cell.
- • Restriction enzymes cut DNA at specific sequences; seals the inserted gene in place.
- • The universal genetic code means bacterial ribosomes can translate human mRNA accurately.
PLTW connection and today's work
Open Activity 4.1.2 Protein Factories in myPLTW for Lesson 4.1 Manufacturing Human Proteins and diagram the full recombinant DNA flow from human gene to protein medicine.
Today's stopping point: Monday debate should be complete; recombinant DNA flow diagram due 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.
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
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.
Scarcity forces a choice between competing fairness claims, so the allocation rule a board picks determines who is harmed by it.
Because the genetic code is shared, inserting a human gene on a turns a host cell into a manufacturer of the human .
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: Human used to be harvested from pigs. How does a vat of E. coli make it instead?
What you already know: Scarcity forces a choice between competing fairness claims, so the allocation rule a board picks determines who is harmed by it.
New idea: Because the genetic code is shared, inserting a human gene on a turns a host cell into a manufacturer of the human .
Visual or model: F1. F1. A lesson illustration or teaching diagram for Recombinant DNA flow. 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 recombinant DNA flow.
- 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: Human used to be harvested from pigs. How does a vat of E. coli make it instead?
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 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.
- • recombinant DNA: Use the lesson context and glossary entry to explain recombinant DNA in your own words.
- • : The process of separating a target molecule, such as a or DNA, away from everything else in a mixture to get a clean sample.
- • : A process that filters waste and excess fluid from blood across a semipermeable membrane, used clinically when the kidneys cannot do this job.
- • HLA: Human antigens, proteins on cell surfaces that mark cells as self, helping the immune system spot foreign cells and guiding transplant matching.
- • scaffold: A supportive framework, such as an engineered structure in repair or a base molecule in chemistry, that other parts build onto or grow within.
- • transplant: The transfer of a healthy organ, , or cells from a donor into a patient to replace a part that has failed.
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.
Stored information can be copied, read, and converted into a functional product.
Limit: Genes are regulated biological sequences, not conscious instructions, and one gene rarely determines a whole trait alone.
You can sequence the steps of making recombinant DNA.
Limit: E3 defines the classroom product or success criterion. It is not independent scientific evidence and cannot justify a 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 recombinant DNA flow supports before submitting the notebook record named on today's page.
- • Judge the three approaches against the function you must restore, the patient's needs, and each one's failure modes.
- • Pick the approach with the best-presented comparison chart, since a clear write-up shows which option is strongest.
- • Stop short of calling your pick clinic-ready, because a classroom comparison shows no testing or regulatory approval.
Response: State one choice, cite at least two evidence IDs, explain the rule that connects them, and add one limitation. Submit it as the notebook record.
Claim ceiling: Today's evidence supports a classroom claim about recombinant DNA flow. 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 recombinant DNA flow.
- • 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 think the bacterium must be modified to understand human DNA.. The trap: Nothing about the bacterium's reading machinery is changed. The genetic code is effectively universal, so the same codon means the same amino acid in both. What is engineered is the delivery, the , not the interpretation.
Labeled recombinant-DNA flow (insulin example):
- Step 1, Isolate the gene: Cut the human insulin gene out of human DNA using a restriction enzyme such as EcoRI, which leaves sticky ends.
- Step 2, Cut the plasmid: Use the SAME restriction enzyme to open the bacterial plasmid, so its sticky ends match the gene's sticky ends.
- Step 3, Insert the gene: DNA ligase seals the human insulin gene into the plasmid. The result is recombinant DNA, meaning DNA combined from two sources.
- Step 4, Transform the host: Take up the recombinant plasmid into a host cell such as E. coli. The transformed bacterium now carries the human gene.
- Step 5, Manufacture the protein: The bacterium reads the inserted gene using the same genetic code all cells share, transcribes it to mRNA, and translates it into human insulin protein. Grow the culture and the bacteria make insulin in bulk.
Named product: human insulin (used to treat diabetes).
Why a bacterium can read a human gene: the genetic code is nearly universal, so the codons in the human gene mean the same amino acids inside the bacterial cell.
(Tip: label the restriction enzyme as the same tool in Step 1 and Step 2, since matching sticky ends is the part graders look for.)
This model shows the level of evidence and organization needed to complete: Completes the recombinant-DNA flow diagram: a labeled sequence showing a plasmid cut open, a human gene inserted, a host cell transformed, and the named human protein produced.
- Date and label the entry.
- Record the procedure, observation, or design decision clearly.
- End with what the evidence means and the next step.
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: Attach the diagram to your PLTW tracker, and turn it in on Schoology under the Unit 4 Recombinant DNA Flow assignment.
- 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 Recombinant DNA flow. 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.
Play the cold open at the start of the unit to set the scene. Each recording is AI-generated and simulated (fictional callers, no real people or student data).
Classroom documents for this lesson are posted in Schoology. Open Clever, then Schoology, and find each one by the name shown on its card.
Use this for optional reserve or extra-credit work after the required class lesson is complete.
Placement rationale
Matched Organ failure overview and by path:Medical-Interventions/Unit-4_When-Organs-Fail/4.2_Organ-Failure; keywords:organ failure, kidney, dialysis. Score 146. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Use this for optional reserve or extra-credit work after the required class lesson is complete.
Placement rationale
Matched Organ failure overview and by path:Medical-Interventions/Unit-4_When-Organs-Fail/4.2_Organ-Failure; keywords:organ failure, kidney. Score 142. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Use this for optional reserve or extra-credit work after the required class lesson is complete.
Placement rationale
Matched Organ failure overview and by path:Medical-Interventions/Unit-4_When-Organs-Fail/4.2_Organ-Failure; keywords:kidney, renal. Score 138. 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 recombinant DNA flow. It cannot prove causation, diagnose a real patient, or justify action outside this room.
Restriction enzymes cut both the plasmid and the human gene. Why does that matter for joining them?
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. This lesson has more than one, and they cover different skills.
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 Notebook check.
Go 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.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
MedlinePlus: Organ TransplantationYou'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.
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