Is ethanol really a viable alternative to petroleum-based fuels?

Explanation:

Ethanol fuel has been lauded as a viable alternative to petroleum-based fuels, offering not only less pollution to the environment, but also a sustainable source of energy. ... Most vehicles run on mixtures of gas and ethanol; this mixture is common at most gas stations across the country

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.