Biofuels Are Mainly Produced by

Multiple Choice

Biofuels are mainly produced by

A) the breakdown of cell wall biopolymers into sugars that can be fermented.
B) plants that convert hemicellulose into gasoline.
C) the genetic engineering of ethanol-generating genes into plants.
D) transgenic crops that have cell walls containing ethylene.
E) plants that are easy to grow in arid environments.