Protein expression
Do now
Explain how a host cell expresses the inserted gene to produce the target protein.
- Hand in
- Annotated notes tracing transcription and translation of the inserted gene, two yield-affecting conditions, and one piece of expression evidence from sample data.
- 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.
Your bacteria from Wednesday carry the human gene, but a can hold the gene and still make almost no . What has to happen inside the cell for the gene to actually turn into product?
Explain how a host cell expresses the inserted gene to produce the target .
- • You'll be able to describe how a host cell expresses an inserted gene.
- • You'll be able to name a condition that changes yield.
- A cell carries a gene but makes none of its . Name the two steps, in order, that a cell must run to turn a gene into a protein.
- GFP is a that glows green under UV light. Why would scientists attach or use GFP to check whether a gene was expressed?
- 1Read the expression notes in the PLTW course shell and define expression.
- 2Trace and of the inserted gene in the host cell.
- 3Explain why growth conditions can raise or lower how much is made.
- 4Identify one sign that expression worked in the sample data.
- 5Add your expression notes to your Unit 4 PLTW tracker evidence.
What did this day actually feel like?
Protein expression
Getting bacteria to actually make the protein, and confirming they did. Present is not the same as correctly folded and functional.
AT HOME, THE WEEKEND BEFORE TUE DEC 1 Cloning workflow quiz Quiz, then straight on with the workflow still fresh.
Checkpoint. He asked for fifteen minutes a few times this week on the unanswered pile rather than new work, which is the most reasonable homework I have ever been given.
Turned in: WebXam practice → 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.
Getting bacteria to actually make the protein, and confirming they did. Present is not the same as correctly folded and functional.
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: 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.
- 0-10Read expression notes; define expression in own words
- 10-28Trace of inserted gene; annotate promoter role
- 28-45Trace ; annotate ribosome reading human mRNA in bacteria
- 45-58List two growth conditions that affect yield; explain mechanism
- 58-70Identify expression evidence in sample data; write one sign
- 70-80Add notes to tracker; preview Friday quiz topics
- • Your bacteria now carry the recombinant , but carrying DNA is not the same as making .
- • Expression is the process that turns that DNA into a usable product.
- • Today you trace the path from inserted gene to finished and find the levers that control yield.
- • mechanics are central to the Molecular and Genetic Technology domain on the WebXam.
- • Expression requires the inserted gene to have a promoter the host cell recognizes.
- • Temperature, nutrient availability, and inducer concentration each affect mRNA and yield.
- • GFP fluorescence or activity is used as a visible proxy for successful expression.
Plasmids, restriction enzymes, ligase, transformation, protein expression. · expression
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: Open Activity 4.1.2 Factories in myPLTW and trace and of the inserted gene to explain protein expression in the host cell.
Mark the -expression entry complete and attach your annotated expression notes.
should be done (Wednesday); annotated expression notes due today.
Annotated / trace with two yield conditions and one expression sign submitted to the tracker.
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.
Plasmids, restriction enzymes, ligase, transformation, protein expression. · Protein expression
Open Activity 4.1.2 Factories in myPLTW and trace and of the inserted gene to explain protein expression in the host cell.
should be done (Wednesday); annotated expression notes due today.
This is how Mr. Mendoza sees the class keeping pace with PLTW. Be honest, it only helps if it is accurate.
🎯 Explain how a host cell expresses the inserted gene to produce the target .
- Read the expression notes in the PLTW course shell and define expression.
- Trace and of the inserted gene in the host cell.
- Explain why growth conditions can raise or lower how much is made.
- Identify one sign that expression worked in the sample data.
- Add your expression notes to your Unit 4 PLTW tracker evidence.
Notebook check: Annotated notes tracing and of the inserted gene, two yield-affecting conditions, and one piece of expression evidence from sample data.
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 expression notes in the PLTW course shell and define expression. | _______ |
| Trace and of the inserted gene in the host cell. | _______ |
| Explain why growth conditions can raise or lower how much is made. | _______ |
| Identify one sign that expression worked in the sample data. | _______ |
| Add your expression notes to your Unit 4 PLTW tracker evidence. | _______ |
Working solo? Put your own name in "Who" for every row.
- You'll be able to describe how a host cell expresses an inserted gene.
- You'll be able to name a condition that changes yield.
- 1Do thisExplain how a host cell expresses the inserted gene to produce the target protein.
- 2Use this resource
- 3Submit thisNotebook check: Annotated notes tracing transcription and translation of the inserted gene, two yield-affecting conditions, and one piece of expression evidence from sample data.
- 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) › Plasmids, restriction enzymes, ligase, transformation, protein expression. › Notebook checkOpen 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.
A recombinant can be mass-produced because puts the into cells, selection keeps only the cells that took it, and separates the protein from debris, so each step sets up the next.
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 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: Your bacteria from Wednesday carry the human gene, but a can hold the gene and still make almost no . What has to happen inside the cell for the gene to actually turn into product?
What you already know: A recombinant can be mass-produced because puts the into cells, selection keeps only the cells that took it, and separates the protein from debris, so each step sets up the next.
New idea: 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.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Protein expression. 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 expression.
- 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: Your bacteria from Wednesday carry the human gene, but a can hold the gene and still make almost no . What has to happen inside the cell for the gene to actually turn into product?
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 found in bacteria that copies itself separately from the main and is often used to carry genes in the lab.
- • : DNA made by joining genetic material from two different sources, often to insert a chosen gene into a cell so it makes a useful .
- • : An that joins two pieces of DNA together by sealing the gap in their backbone, vital in genetic engineering.
- • : The process by which a bacterial cell takes up foreign DNA, such as a , from its surroundings and begins using those new genes.
- • expression: The process of turning a gene on so its DNA instructions are used to make RNA and , deciding when and where a gene is active.
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.
Expression requires the inserted gene to have a promoter the host cell recognizes.
Limit: E1 supplies context or an observation; it does not by itself establish the explanation.
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.
Limit: E2 is a teaching statement or comparison and must be checked against the task evidence.
You'll be able to describe how a host cell expresses an inserted gene.
Limit: E3 supports only the result or product criterion named here; it cannot justify a broader clinical or causal claim.
PLTW-GEND-2026-11-30 · Simulated classroom evidence scenario
Your role: medical interventions team member
Decision: Your team must decide what the evidence from expression supports before submitting the notebook record 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 notebook record.
Claim ceiling: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about expression. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
= 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.
- • The solution must address the stated need in expression.
- • 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 believe that once a cell contains a gene, it automatically makes the matching , so having the gene equals having the protein.. The trap: Having the gene is not the same as expressing it. The gene must have a promoter the host recognizes, and then it must be transcribed to mRNA and translated to . Growth conditions can turn that output up or down. If you equate gene with protein, you cannot explain why identical cells make different amounts.
What expression means: expression is the cell reading the inserted gene and using it to build the target protein.
Tracing the steps:
1. Transcription: the host cell's machinery copies the inserted gene into mRNA, but only if the gene has a promoter the host cell recognizes.
2. Translation: ribosomes read the mRNA and assemble the amino acid chain that folds into the target protein.
Two conditions that change yield:
- Temperature: too high or too low can slow the cell or cause the protein to misfold, lowering usable yield.
- Inducer concentration: adding the right amount of inducer can switch the gene on strongly, raising protein output.
Evidence expression worked: in the sample data, the cells glowed green under UV light. Because GFP fluorescence is a visible proxy for the protein being made, the glow tells me the inserted gene was expressed.
This model shows the level of evidence and organization needed to complete: Completes the expression task: annotated notes tracing transcription and translation of the inserted gene, two conditions that change yield, and one piece of expression evidence from sample data.
- 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: Add your expression notes to your Unit 4 PLTW tracker and submit to the class site.
- 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 Protein expression. 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.
Use this if you were absent, got stuck, or need another pass before you submit the lesson artifact.
Placement rationale
Matched and cloning by path:Medical-Interventions/Unit-4_When-Organs-Fail/4.1_Manufacturing-Human-Proteins; keywords:, pglo. 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 and cloning by path:Medical-Interventions/Unit-4_When-Organs-Fail/4.1_Manufacturing-Human-Proteins; keywords:, pglo. Score 138. 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 cloning by path:Medical-Interventions/Unit-4_When-Organs-Fail/4.1_Manufacturing-Human-Proteins; keywords:, pglo. Score 138. 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 expression. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Two bacterial cultures carry the identical GFP gene, but one glows brightly and the other barely glows. Their DNA sequences are the same. Give one reason the amount of protein could differ.
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 Notebook check 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: CloningYou'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.