試題詳解

36. The specific relationship between a legume and its symbiotic Rhizobium species probably depends on

(A) each Rhizobium species having a form of nitrogenase that only works in the appropriate legume host.

(B) destruction of all incompatible Rhizobium species by enzymes secreted from the legume's roots.

(C) each legume being found where the soil has only the Rhizobium specific to that legume.

(D) each legume having a specific set of early nodulin genes.

(E) specific recognition between the chemical signals and signal receptors of the Rhizobium and legume species.