Which of the following statements about the pathogen-specific response is true?
A. The pathways involved always trigger the hypersensitive response.
B. The pathogen is recognized by its avr gene product.
C. There is never a gene-for-gene response.
D. If the R gene product is not triggered, no disease will occur.
E. Avr and R gene pairs have been cloned in species pathogenized by microbes, fungi, and insects.
B. The pathogen is recognized by its avr gene product.
A hypersensitive response in a plant will be initiated if an R gene (from the plant) binds to an avr gene (from the pathogen). This response is called the "gene for gene hypothesis".
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