Q: Which equation best represents the integration of T-DNA into the plant genome during Agrobacterium-mediated transformation?

$$\text{Plant Genome} + \text{T-DNA} \rightarrow \text{Transgenic Plant Genome}$$

Question 1

Which of the following best describes a genetically modified organism (GMO)?

Accepted Answer

An organism whose genome has been modified in some way by human intervention.

Question 2

The Ti plasmid from Agrobacterium tumefaciens is commonly used in plant genetic engineering because:

Accepted Answer

It can transfer a segment of DNA (T-DNA) into the plant cell genome.

Question 3

Which of the following is a major advantage of Bt-expressing plants?

Accepted Answer

They are more resistant to insect damage due to the expression of a bacterial toxin.

Question 4

Golden Rice was engineered to address which two nutritional deficiencies?

Accepted Answer

Vitamin A and iron

Question 5

Which equation best represents the integration of T-DNA into the plant genome during Agrobacterium-mediated transformation?

Accepted Answer

$$	ext{Plant Genome} + 	ext{T-DNA} ightarrow 	ext{Transgenic Plant Genome}$$

Question 6

AquaBounty salmon grow faster than wild-type salmon because:

Accepted Answer

Their growth hormone gene is controlled by enhancer elements that are active year-round.

Question 7

Which of the following is a potential environmental concern associated with Bt-expressing plants?

Accepted Answer

Bt plants may harm beneficial insects in the environment.

Question 8

Roundup Ready crops are genetically engineered to:

Accepted Answer

Resist glyphosate by expressing a bacterial ESPS enzyme.

Question 9

Which of the following is a plausible consequence of widespread use of Roundup Ready crops?

Accepted Answer

Weeds may become resistant to glyphosate, requiring more herbicide use.

Question 10

In the context of gene therapy, which vector is most likely to be used for delivering a therapeutic gene to human cells?

Accepted Answer

Adenoviral vector

Question 11

Which of the following best explains why Golden Rice grains are yellow?

Accepted Answer

They contain beta-carotene, a precursor to vitamin A.

Question 12

Which of the following is a reason for societal opposition to genetically modified crops?

Accepted Answer

GM crops are perceived as unsafe or unnatural by some groups.

Question 13

Which of the following is a multi-step process required to create a transgenic plant using Agrobacterium tumefaciens?

Accepted Answer

Infect plant cells with Agrobacterium, transfer T-DNA, integrate T-DNA into plant genome, regenerate plant from tissue culture.

Question 14

Which formula best represents the relationship between the number of genetically modified crops and the percentage of global arable land planted with them?

Accepted Answer

$$	ext{GM Crop Area} = \frac{	ext{Total GM Crops}}{	ext{Total Arable Land}} 	imes 100\%$$

Question 15

Which of the following is a plausible reason why farmers are forced to buy new seeds each year for GM crops?

Accepted Answer

Seed companies enforce contracts that prohibit saving and replanting seeds.

Question 16

Which of the following best describes the function of a 'reporter' construct in genetic engineering?

Accepted Answer

It is used to visualize gene expression by linking a detectable marker to a gene of interest.

Question 17

Which of the following is a plausible outcome if insects become resistant to Bt toxin in GM crops?

Accepted Answer

Farmers will need to use alternative insecticides or new GM seeds.

Question 18

Which of the following best explains why the approval process for AquaBounty salmon took over 20 years?

Accepted Answer

There were concerns about environmental impact and food safety.

Question 19

Which of the following is a correct statement about the use of CRISPR in genetic modification?

Accepted Answer

CRISPR is used to selectively edit genes within an organism's genome.

Genetically Modified Organisms: Plants and Animals – Mechanisms, Applications, and Societal Impacts 22

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