Transgenic Plant MCQs

Question 1

Which of the following gene detoxify herbicide bronoxynil?

Accepted Answer

Nitrilase

Answer

Glutathione S-transferase (GST)

Answer

Phosphinothricin acetyl transferase

Answer

All of these

Question 2

For developing herbicide resistance in transgenic plants which of the following approach/(es) is/are used?

Accepted Answer

All of the above

Answer

Target molecule is made insensitive to herbicide

Answer

Target protein is overproduced

Answer

A pathway should be introduced that detoxify the herbicide

Question 3

Which of the following is not a characteristic of a transgenic crop?

Accepted Answer

none of these

Answer

herbicide resistance

Answer

Bt insect resistance toxin

Answer

increased methionine content

Question 4

Phosphinothricin acetyl transferase is encoded by

Accepted Answer

bar gene in Streptomyces spp

Answer

gene bxn in Klebsiella pneumoniae

Answer

both (a) and (b)

Answer

none of these

Question 5

Reducing the expression of pectin methylesterase (PME) has resulted in

Accepted Answer

tomato juice that has higher viscosity

Answer

plants with resistance to bacteria and fungi

Answer

tomato fruit that last longer before they become rotten

Answer

tomato fruit that will not ripen

Question 6

Resistance to sulphonyl urea compounds in transgenic tobacco plant has been developed by the transfer of

Accepted Answer

gene for ALS (acetolactate synthase)

Answer

gene for EPSPS (5-enol-pyruvyl shikimat 3 phosphate synthase)

Answer

gene for GS (glutamine synthase)

Answer

any of the above

Question 7

In transgenic plants that have been manipulated to express patho-genesis-related (PR) proteins all the time it has been shown that

Accepted Answer

these proteins trigger the production of other antimicrobial defenses

Answer

these provide no protection at all against pathogens

Answer

expression of one PR protein provides high levels of protection against many pathogens

Answer

expression of two PR proteins provides some protection against a few pathogens