How Is the Ug99 Strain of Wheat Stem Rust Fungus

question 39

Multiple Choice

How is the Ug99 strain of wheat stem rust fungus spreading around the world?  

• A)spores are carried by birds
• B)viral vectors carried in insects
• C)imported infected wheat
• D)wind dispersal of spores
• E)an infected plant touches another plant

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Definitions:

Nucleophilicity

A property of chemical species that reflects their tendency or ability to donate an electron pair to an electrophile to form a chemical bond.

Basicity

A measure of the ability of a compound to accept protons.

Nucleophilicity

A measure of a molecule or ion's strength as a nucleophile, or its ability to donate an electron pair to an electrophile.

Basicity

A measure of a substance's ability to donate electrons or accept protons, commonly applied in the context of acids and bases.