26.8b-Carotene is a tetraterpene because it has 40 carbon atoms. The tail-to-tail linkage is at the midpointof the molecule and connects two 20-carbon fragments.26.9Isopentenyl pyrophosphate acts as an alkylating agent toward farnesyl pyrophosphate. Alkylation isfollowed by loss of a proton from the carbocation intermediate, giving geranylgeranyl pyrophos-phate. Hydrolysis of the pyrophosphate yields geranylgeraniol.
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