Genetic Engineering Story Board: Steps to Produce Insulin Using Bacteria
Diagram illustrating the steps of genetic engineering to produce insulin, showing gene extraction from an animal cell, insertion into bacterial DNA, bacterial reproduction, and insulin extraction for human use.
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Show Answer Key & Explanations
Step-by-step solution for: Genetic modification KS3 Activate Science
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Show Answer Key & Explanations
Step-by-step solution for: Genetic modification KS3 Activate Science
The image you've uploaded is a "Genetic Engineering Story Board ANSWERS" that illustrates the process of genetically engineering bacteria to produce insulin, a common example in biotechnology. Below is a detailed explanation of each step, along with an analysis of the process and its significance.
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This storyboard demonstrates how scientists use recombinant DNA technology to make bacteria produce human insulin, which is then used to treat diabetes. This is a classic application of genetic engineering.
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#### Step 1: Isolation of the Insulin Gene
- Visual: An animal cell (likely a human or pancreatic cell) is shown with genetic information being extracted.
- Explanation: The gene responsible for producing insulin is isolated from an animal cell (often a human or pig cell). This gene contains the instructions to make the insulin protein.
> 📌 *Note:* In real-world applications, this gene is typically obtained through molecular cloning techniques using PCR or cDNA libraries.
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#### Step 2: Removal of Bacterial DNA
- Visual: A bacterial cell with its DNA removed.
- Explanation: DNA is extracted from a bacterium (usually *Escherichia coli*), which will serve as the host organism. This bacterial DNA includes a plasmid, a small circular piece of DNA that can replicate independently.
> 🔬 Plasmids are ideal vectors (carriers) for inserting foreign genes because they can be easily manipulated and replicated in bacteria.
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#### Step 3: Insertion of the Insulin Gene into Bacterial DNA
- Visual: The insulin gene is inserted into the plasmid.
- Explanation: The insulin gene is spliced into the bacterial plasmid using restriction enzymes (molecular scissors) and DNA ligase (molecular glue). This creates recombinant DNA — a new DNA molecule combining genetic material from different sources.
> 🧬 This modified plasmid now carries the human insulin gene and can be introduced into bacteria.
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#### Step 4: Transformation of Bacteria
- Visual: The recombinant plasmid is placed back into a bacterial cell.
- Explanation: The modified plasmid is inserted into a bacterial cell via a process called transformation. The bacterium now has the ability to read and express the human insulin gene.
> ⚙️ This step is crucial: the bacteria must take up the foreign DNA and incorporate it into its system.
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#### Step 5: Reproduction and Protein Production
- Visual: Bacteria divide and produce insulin molecules.
- Explanation: As the genetically modified bacteria reproduce, they copy the insulin gene and produce insulin protein. Each new bacterial cell inherits the recombinant plasmid and continues making insulin.
> 💡 Because bacteria reproduce rapidly, large quantities of insulin can be produced efficiently and cost-effectively.
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#### Step 6: Harvesting and Use of Insulin
- Visual: A syringe injecting insulin into a person.
- Explanation: Once enough insulin is produced, it is harvested, purified, and administered to humans who need it (e.g., people with Type 1 diabetes).
> 🩺 This method replaced earlier methods of extracting insulin from animal pancreases, which were less effective and could cause allergic reactions.
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| Step | Action |
|------|--------|
| 1 | Extract insulin gene from animal cell |
| 2 | Remove plasmid from bacteria |
| 3 | Insert insulin gene into plasmid |
| 4 | Introduce recombinant plasmid into bacteria |
| 5 | Bacteria multiply and produce insulin |
| 6 | Collect insulin and administer to patients |
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- Medical Impact: Genetically engineered insulin is identical to human insulin, reducing side effects.
- Scalability: Bacteria grow quickly, enabling mass production.
- Cost-Effective: Cheaper than traditional extraction methods.
- Ethical Advantage: Avoids reliance on animal tissues.
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- Recombinant DNA: Combining DNA from different organisms.
- Vector: Plasmid used to carry foreign DNA into host cells.
- Transformation: Uptake of foreign DNA by bacteria.
- Gene Expression: The bacterial machinery reads the human gene and produces the protein.
---
The storyboard correctly illustrates the process of producing human insulin using genetically modified bacteria. By inserting the human insulin gene into bacterial plasmids, scientists enable bacteria to produce insulin on a large scale, which is then harvested and used to treat diabetes.
This is a prime example of biotechnology's power to solve medical challenges through genetic engineering.
Let me know if you'd like a simplified version for students or want to explore other applications!
---
🔬 Overview:
This storyboard demonstrates how scientists use recombinant DNA technology to make bacteria produce human insulin, which is then used to treat diabetes. This is a classic application of genetic engineering.
---
✔ Step-by-Step Explanation:
#### Step 1: Isolation of the Insulin Gene
- Visual: An animal cell (likely a human or pancreatic cell) is shown with genetic information being extracted.
- Explanation: The gene responsible for producing insulin is isolated from an animal cell (often a human or pig cell). This gene contains the instructions to make the insulin protein.
> 📌 *Note:* In real-world applications, this gene is typically obtained through molecular cloning techniques using PCR or cDNA libraries.
---
#### Step 2: Removal of Bacterial DNA
- Visual: A bacterial cell with its DNA removed.
- Explanation: DNA is extracted from a bacterium (usually *Escherichia coli*), which will serve as the host organism. This bacterial DNA includes a plasmid, a small circular piece of DNA that can replicate independently.
> 🔬 Plasmids are ideal vectors (carriers) for inserting foreign genes because they can be easily manipulated and replicated in bacteria.
---
#### Step 3: Insertion of the Insulin Gene into Bacterial DNA
- Visual: The insulin gene is inserted into the plasmid.
- Explanation: The insulin gene is spliced into the bacterial plasmid using restriction enzymes (molecular scissors) and DNA ligase (molecular glue). This creates recombinant DNA — a new DNA molecule combining genetic material from different sources.
> 🧬 This modified plasmid now carries the human insulin gene and can be introduced into bacteria.
---
#### Step 4: Transformation of Bacteria
- Visual: The recombinant plasmid is placed back into a bacterial cell.
- Explanation: The modified plasmid is inserted into a bacterial cell via a process called transformation. The bacterium now has the ability to read and express the human insulin gene.
> ⚙️ This step is crucial: the bacteria must take up the foreign DNA and incorporate it into its system.
---
#### Step 5: Reproduction and Protein Production
- Visual: Bacteria divide and produce insulin molecules.
- Explanation: As the genetically modified bacteria reproduce, they copy the insulin gene and produce insulin protein. Each new bacterial cell inherits the recombinant plasmid and continues making insulin.
> 💡 Because bacteria reproduce rapidly, large quantities of insulin can be produced efficiently and cost-effectively.
---
#### Step 6: Harvesting and Use of Insulin
- Visual: A syringe injecting insulin into a person.
- Explanation: Once enough insulin is produced, it is harvested, purified, and administered to humans who need it (e.g., people with Type 1 diabetes).
> 🩺 This method replaced earlier methods of extracting insulin from animal pancreases, which were less effective and could cause allergic reactions.
---
🎯 Summary of the Process:
| Step | Action |
|------|--------|
| 1 | Extract insulin gene from animal cell |
| 2 | Remove plasmid from bacteria |
| 3 | Insert insulin gene into plasmid |
| 4 | Introduce recombinant plasmid into bacteria |
| 5 | Bacteria multiply and produce insulin |
| 6 | Collect insulin and administer to patients |
---
🌟 Why Is This Important?
- Medical Impact: Genetically engineered insulin is identical to human insulin, reducing side effects.
- Scalability: Bacteria grow quickly, enabling mass production.
- Cost-Effective: Cheaper than traditional extraction methods.
- Ethical Advantage: Avoids reliance on animal tissues.
---
❗ Key Concepts in Genetic Engineering:
- Recombinant DNA: Combining DNA from different organisms.
- Vector: Plasmid used to carry foreign DNA into host cells.
- Transformation: Uptake of foreign DNA by bacteria.
- Gene Expression: The bacterial machinery reads the human gene and produces the protein.
---
✔ Final Answer:
The storyboard correctly illustrates the process of producing human insulin using genetically modified bacteria. By inserting the human insulin gene into bacterial plasmids, scientists enable bacteria to produce insulin on a large scale, which is then harvested and used to treat diabetes.
This is a prime example of biotechnology's power to solve medical challenges through genetic engineering.
Let me know if you'd like a simplified version for students or want to explore other applications!
Parent Tip: Review the logic above to help your child master the concept of genetic engineering worksheet.
