Question 1:

The correct answer is B. A gene for herbicide resistance being transferred into the crop plant from another species.

Explanation:
Genetic engineering involves directly manipulating an organism's DNA, often by transferring a gene from one species to another (transgenic technology).

• A. Plants being grown hydroponically – This is a growing method without soil; not genetic engineering.

• B. A gene for herbicide resistance being transferred into the crop plant from another species – This is a direct example of genetic engineering (e.g., Roundup Ready crops).

• C. Crop plants being grown without the use of chemical pesticides – This could be organic farming or integrated pest management, not genetic engineering.

• D. Plants being grown over several generations to produce larger fruit – This is selective breeding, not genetic engineering.

Thus, B is correct.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

The correct answer is A. They have plasmids.

Explanation:
Bacteria are widely used in genetic engineering primarily because they contain plasmids — small, circular DNA molecules separate from the bacterial chromosome. Plasmids can be easily cut with restriction enzymes and foreign genes can be inserted into them (recombinant DNA), then taken up by bacteria for replication and expression.

• A. They have plasmids – Correct; plasmids act as vectors for gene insertion.

• B. Cell wall present – True but not specifically useful for genetic engineering (plant cells also have cell walls).

• C. Lack of a nucleus – True for prokaryotes, but not the main reason; the lack of a nucleus does not directly enable gene insertion.

• D. Lack of a vacuole – True but irrelevant to their use in genetic engineering.

Thus, A is the best answer.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

The correct answer is C. Restriction enzyme.

Explanation:
Restriction enzymes (restriction endonucleases) are used to cut DNA at specific recognition sequences. In genetic engineering, they are used to cut out (isolate) a gene, such as the human insulin gene, from a chromosome.

• A. Ligase – Joins DNA fragments together (used after cutting).

• B. Recombinase – Involved in recombination, but not the standard enzyme for cutting out a gene initially.

• C. Restriction enzyme – Correct; cuts DNA at specific sites to remove the gene.

• D. Hydrolase – A broad class of enzymes that break bonds with water; not specific for cutting DNA at recognition sequences in genetic engineering.

Thus, C is correct.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

Correct Answer: A

Diagram labels:

• Structure 1: Bacterial DNA (nucleoid / circular chromosome) – contains essential genetic information.

• Structure 2: Plasmids – small, circular loops of extra-chromosomal DNA; used as vectors in genetic engineering.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

The correct answer is D. To provide complementary ‘sticky ends’.

Explanation:
Using the same restriction enzyme to cut both the bacterial plasmid and the human insulin gene ensures that the DNA fragments produced have complementary sticky ends (single-stranded overhangs). This allows the insulin gene to be inserted into the plasmid in the correct orientation, where it can be sealed by DNA ligase.

• A. To save money – Not the primary biological reason.

• B. The laboratory only has one type – Not necessarily true, and not the scientific reason.

• C. To save time – Time saving is a side effect, not the key reason.

• D. To provide complementary sticky ends – Correct; this is essential for successful gene insertion.

Thus, D is correct.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

The correct answer is ligase.

Explanation:
After the plasmid and the insulin gene have been cut with the same restriction enzyme (creating complementary sticky ends), DNA ligase is used to join (seal) the insulin gene into the plasmid by forming covalent bonds between the sugar-phosphate backbones.

• Ligase – Correct; it acts like "molecular glue."

• Restriction enzyme – Used to cut DNA, not to join it.

• Glue – Not a standard biological term for this process.

• Recombinase – Involved in recombination, but in basic genetic engineering diagrams, ligase is the standard answer for inserting the gene into the plasmid.

Thus, ligase is the correct word to complete the sentence.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

The correct answer is D. Complementary base pairing of DNA of gene and plasmid.

Explanation:
In a recombinant plasmid, the inserted gene (e.g., insulin gene) and the plasmid DNA are both double-stranded DNA. The “sticky ends” produced by the same restriction enzyme have complementary DNA base sequences, allowing them to hydrogen-bond through complementary base pairing (A with T, G with C). This holds the gene and plasmid together temporarily before DNA ligase seals the sugar-phosphate backbone permanently.

• A. Glue – Not a biological term for this.

• B. The enzyme ligase – Ligase seals the backbone after base pairing, but the joining at point A/B is due to complementary base pairing, not ligase itself.

• C. Complementary base pairing of RNA of gene and plasmid – Incorrect; it’s DNA-DNA base pairing, not RNA.

• D. Complementary base pairing of DNA of gene and plasmid – Correct.

Thus, D is correct.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

The correct answer is B. industrial fermenters.

Explanation:
For industrial production of insulin (or other recombinant proteins), bacteria containing the recombinant plasmid are grown in large industrial fermenters (also called bioreactors). These provide controlled conditions (temperature, pH, oxygen, nutrients) for large-scale growth and maximum yield of the desired product (insulin).

• A. test tubes – Used for small-scale laboratory experiments, not industrial production.

• B. industrial fermenters – Correct; they are used for mass production.

• C. petri dishes – Used for culturing bacteria on solid media, typically for isolation, not bulk production.

• D. conical flasks – Used in labs for small-scale liquid cultures, not industrial scale.

Thus, B is correct.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

The correct answer is D. Some religions believe that man has no right to manipulate the course of nature.

Explanation:
The question asks for something that is not an advantage of using genetically engineered insulin. Options A, B, and C are all advantages:

• A – No ethical issues concerning use of animals (compared to extracting insulin from slaughtered animals).

• B – No side effects from animal insulin (e.g., allergic reactions due to differences from human insulin).

• C – No risk of transferring infections (e.g., mad cow disease or other animal-borne pathogens).

Option D refers to a religious or ethical objection to genetic engineering. This is not an advantage; it is a potential disadvantage or criticism of the technology.

Thus, D is correct.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

The correct answer is C. Biodiversity is reduced.

Explanation:
When crop plants are engineered to produce their own insecticide (e.g., Bt toxin), they kill not only harmful pests but also non-target insects such as beneficial pollinators (bees, butterflies) and natural pest predators. Over time, this can reduce biodiversity in the farmland ecosystem, which is a disadvantage to the environment. It may also lead to insecticide-resistant pests.

• A. Sales of chemical insecticides are reduced – This would be an advantage for some (cost saving), not a disadvantage.

• B. Moth that lays its eggs in the crop plant dies – This is the intended effect (killing pests), so it is an advantage for the farmer.

• C. Biodiversity is reduced – Correct; this is a clear environmental disadvantage.

• D. Crop plant grows bigger – This would be an advantage, not a disadvantage.

Thus, C is correct.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.