Transgenic Plant
Which of the following has been widely used to provide resistance against plant viruses?

Virus resistance genes from bacteria
Expression of virus coat protein genes in transgenic plants
Expression of anti-virus genes in vectors that transmit viruses
Expression of ribonuclease (RNase) genes in host plants

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

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

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Transgenic Plant
Low temperatures induce the expression of many cold-induced genes. Transgenic plants with improved cold tolerance have been produced by

increasing evaporative cooling from leaf surfaces
expressing a gene for production of antifreeze (ethylene glycol) in plants
expressing the protein that activates expression of these genes all the time in plants
cooling plants using the Peltier effect

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Transgenic Plant
Transgenic plants

are used to produce human antibodies
contain foreign genes in their cells
both (a) and (b)
are plants that differ in geographical locations

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