The Specific Relationship Between a Legume and Its Mutualistic Rhizobium

question 21

Multiple Choice

The specific relationship between a legume and its mutualistic Rhizobium strain probably depends on

• A) each legume having a chemical dialogue with a fungus.
• B) each Rhizobium strain having a form of nitrogenase that works only in the appropriate legume host.
• C) each legume being found where the soil has only the Rhizobium specific to that legume.
• D) specific recognition between the chemical signals and signal receptors of the Rhizobium strain and legume species.
• E) destruction of all incompatible Rhizobium strains by enzymes secreted from the legume's roots.

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