51. Resistance to sulphonylurea compounds in transgenic tobacco plant has been developed by the transfer of

A. gene for EPSPS (5-enol-pyruvyl shikimate 3 phosphate synthase)
B. gene for ALS (acetolactate synthase)
C. gene for GS (glutamine synthase)
D. any of the above

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

A. these provide no protection at all against pathogens
B. expression of one PR protein provides high levels of protection against many pathogens
C. expression of two PR proteins provides some protection against a few pathogens
D. these proteins trigger the production of other antimicrobial defenses

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