Multiple choice The __________ consist of six isoprene units. sesterterpenes triterpenes tetraterpenes polyterpenes Reveal answer Fill a bubble to check yourself B Correct answer Explanation Triterpenes consist of six isoprene units and have the molecular formula C30H48. The linear triterpene squalene, the major constituent of shark liver oil, is derived from the reductive coupling of two molecules of farnesyl pyrophosphate.