Genetics of Disease (Medical Interventions)

Unit 4: Unit 4 When Organs Fail (Synthesis)MI 4Biotechnology Research and Experiments

Trace A Recombinant Protein Workflow

Order the steps of making a human protein with recombinant DNA: gene to plasmid to host cells to expression to purification.

Builds on (2 levels back)inferred · high confidence

Observation vs. inference: Forensic work starts by separating what was seen from what is concluded.
Evidence identity: Labels, photos, and logs keep evidence tied to the right source.

Prerequisites are inferred: pending teacher review.

Re-learn the skill with worked practice and clear examples.

The recombinant protein workflow runs in order: gene to plasmid, plasmid into host cells (transform), host cells express the protein, then purify it.

Step 1: Read the workflow figure

The five numbered boxes show the order: copy the gene, insert it into a plasmid, transform host cells, express the protein, purify it.

Step 2: Why this order

You can't transform cells until the gene is in a plasmid, and you can't express the protein until the cells have the gene. Purifying comes last, after the protein exists.

Step 3: Name the next step

To pick the next step, find where you are in the order and read the box to its right.

Practice

Use the workflow. The lab has just inserted the gene of interest into a plasmid (step 2). What is the NEXT step?

Approved

Recombinant protein workflow in five ordered steps, left to right. Step 1 copy the gene of interest. Step 2 insert the gene into a plasmid, a small circular DNA vector. Step 3 transform host cells by putting the plasmid into bacteria. Step 4 express the protein as the host cells read the gene and build the protein. Step 5 purify the protein by separating it from everything else.

A.Purify the protein
B.Transform the host cells with the plasmid
C.Copy the gene of interest again
D.Express the protein before any cells have the gene

Show the worked solution ▾

Answer: B. Transform the host cells with the plasmid

Step 1: Find your place: The figure shows step 2 is insert into plasmid. You are right after that box.
Step 2: Read the next box: Step 3 is transform: put the plasmid into host cells.

Why it's right: After the gene is in the plasmid (step 2), the next step is transforming host cells with it (step 3).

Why the others miss:

A: Purifying is step 5; it comes after the protein is made.
C: The gene was already copied in step 1.
D: Cells cannot express the protein until they have been transformed with the gene.

Aligned to BMT: order the recombinant protein workflow · reading level ~grade 9

Where you'd see this

In Unit 4 When Organs Fail (Synthesis), this skill turns class evidence into a result another person can check.

Careers that use this

Bioprocess Technician: Uses trace a recombinant-protein workflow to make a decision from evidence without overclaiming.

Video library

Watch: Trace A Recombinant Protein Workflow

Genetic Engineering

Amoeba Sisters · 8 min

Guided notes

Fill these in as you work through the lesson.

Big idea: To make a human protein in the lab, scientists put the gene into a plasmid, transform host cells with it, let the cells express (build) the protein, then purify it. The order matters.

Key terms: write the meaning

Gene of interest (the DNA instructions for the wanted protein):
Plasmid (vector) (small circular DNA that carries the gene into cells):
Transform (put the plasmid into host cells):
Express (the cells read the gene and build the protein):
Purify (separate the protein from everything else):

The rule

First copy the gene of interest. Next insert it into a . Then the host cells. The cells (build) the protein, and finally you it.

Check yourself

What is a plasmid used for in this workflow?
Why must you transform the host cells BEFORE the protein can be expressed?
What is the last step, and why is it needed?

Work one example

The lab has just inserted the insulin gene into a plasmid. Using the workflow, name the very next step and explain what happens after it until you have pure protein.