1). Perhaps one of the most obvious environments for microbial-plant interaction

Question

1). Perhaps one of the most obvious environments for microbial-plant interactions occurs in:

A. oceans B.lakes C.solis D.All of these

2). Diptera (e.g., Aedes aegypti) are susceptible to delta-endotoxins produced by:

A. Bacillus thuringiensis subsp. kurstaki B. Bacillus thuringiensis subsp. thuringiensis

C. Bacillus thuringiensis subsp . moeeisoni D. None of these

3). The growth of Pachycereus pringlei in igneous rocks is made possible by:

A. endophytic bacteria that produce organic acids B.endophytic bacteria that out compete pathogens

C. epiphttic bacteria that produce organic acids D. epiphytic bacteria that out compete pathogens

4) Pseudomonas syringae has surface proteins that act as ice nucleating sites.

A. True B. False

5). Flavonoids secreted from legume roots:

A. attract nitrogen-fixing Rhizobia B. Induce transcription of genes

C. Both A and B D. Neither A nor B

Explanation / Answer

1. Oceans. As it is the most diversed ecosystems.

2. Bacillus thuringiensis subsp. kurstaki

3. Endophytic bacteria that produce organic acids.

4. True.

5. Flavonoids act as signalling molecule for the symboitic relationship between legumes and their nitrogen fixing symbionts, the rhizobia. The main function of flavonoids in these kinds of interactions is to induce transcription of genes. This induction is required for the synthesis of rhizobial molecules, also known as rod factors.

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