Extremadura PAU Biology Practice Questions - Extremadura PAU Biology Examination - UEx (Biología 2o Bachillerato 2026) Exam

Which chemical feature distinguishes unsaturated fatty acids from saturated fatty acids?

The presence of branched hydrocarbon chains with aldehyde functional groups. The presence of phosphate groups attached to the glycerol backbone. The complete absence of carboxylic acid functional groups at the terminal carbon. The presence of one or more carbon-carbon double bonds (C=C) in the hydrocarbon tail.

Correct Answer:

The presence of one or more carbon-carbon double bonds (C=C) in the hydrocarbon tail.

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