Explain why bacteria are useful in biotechnology
Bacteria reproduce rapidly and can make complex molecules; plasmids and relatively few ethical concerns also make them useful in biotechnology and genetic modification.
Exam scope and assessment notes
Core and Extended · Biology 0970, 2026–2028. Use the stated specimen features and evidence. Diagrams are schematic. Written practice is self-checked; human subject-teacher review, supervised practical competence and cumulative assessment remain pending. Cambridge states that IGCSE 0970 has the same subject content as IGCSE 0610, with 9–1 grading. This StudyForA pathway maps the 2026–2028 syllabus only. This 9–1 graded qualification is available only in a limited number of administrative zones. Confirm that your centre can enter you for this code and exam series with Cambridge International. Cambridge has published a separate syllabus for 2029. StudyForA has not reconciled that version yet; this page supports exams in 2026, 2027 and 2028 only.
Before you begin
- Know that genes are sections of DNA and that organisms use enzymes in cellular processes.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which two Core properties make bacteria useful in biotechnology?
What you will learn
- State two reasons bacteria are useful in biotechnology and genetic modification
- Discuss rapid reproduction, complex-molecule production, plasmids and ethical concerns
Use bacterial properties to produce useful molecules
Bacteria reproduce rapidly, so populations containing a useful genetic change can grow quickly. Bacteria can also make complex molecules, allowing them to produce useful products under suitable conditions. These are the Core reasons required by the syllabus.
Bacteria also contain plasmids, small circular DNA molecules that can be used as vectors in genetic modification. The syllabus also asks students to discuss that there are few ethical concerns over manipulating and growing bacteria compared with some other organisms. These are Supplement points.
Separate advantages from limitations
Rapid reproduction can increase the number of cells carrying a useful gene, but production still depends on nutrient supply, temperature, pH, oxygen where required and waste control. A plasmid can carry inserted DNA, but the cell must also receive and express it for the intended product to be made.
“Few ethical concerns” does not mean no safety, environmental or ethical oversight is needed. Discuss the specific comparison in the question and distinguish ethical concerns from practical conditions for growth.
Pause and explain
What role can a bacterial plasmid have in genetic modification?
Worked example
A bacterium carrying a plasmid with a human-protein gene grows in a fermenter. Explain two reasons bacteria are useful in this process.
Show the worked solution
- Use one Core property and one Supplement feature.
- Connect the property to production.
Answer Bacteria reproduce rapidly, so many cells carrying the plasmid can be produced. Their plasmids can act as vectors carrying the human gene; bacteria can also make the encoded complex molecule.
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Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
State the two Core reasons bacteria are useful in biotechnology and genetic modification.
Give me a hint
Recall reproduction rate and product-making ability.
Compare my reasoning
- Bacteria reproduce rapidly.
- They can make complex molecules.
Bacteria are useful because they reproduce rapidly and can make complex molecules.
Look for these in your work
- Both Core reasons stated
- Terms used accurately
Explain one way plasmids help in genetic modification.
Give me a hint
Describe what may be inserted and what carries it.
Compare my reasoning
- A plasmid is a small circular DNA molecule in bacteria.
- It can act as a vector carrying an inserted gene.
A bacterial plasmid can act as a vector: an inserted gene can be carried in the plasmid into a bacterium.
Look for these in your work
- Plasmid identified as DNA
- Vector role explained
A student says “bacteria have no ethical concerns, so every bacterial process is acceptable.” Improve this discussion.
Give me a hint
Use the syllabus wording and separate ethics from safety and control.
Compare my reasoning
- The syllabus says there are few ethical concerns over their manipulation and growth.
- Safety, containment and product quality still require appropriate control.
There are relatively few ethical concerns over manipulating and growing bacteria, which is one reason they are useful, but this does not mean there are none or remove the need for safety, containment and process controls.
Look for these in your work
- Syllabus point included
- Claim qualified
Common mistakes
- Calling plasmids the bacterial chromosome
- Saying bacteria have no ethical or safety considerations
- Listing rapid reproduction without linking it to production
What can you explain now?
Which two Core properties make bacteria useful in biotechnology?
Compare with the explanation
Rapid reproduction and ability to make complex molecules
Both are named in the Core syllabus.
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Make it stick
What Core properties make bacteria useful, and which two Supplement points add to that explanation?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.