The pigment ?-carotene (below) is a tetraterpene consisting of 8isoprene units. ?-carotene has one unusual head-to-head bondbetween isoprene units in which C-4 carbons of two isoprene unitsare bonded to each other. Mark that bond in the structure. It willappear green when you highlight it.
The pigment beta-carotene (below) is a tetraterpene consisting of 8 isoprene units. beta-carotene has one unusual head-to-head bond between isoprene units in which C-4 carbons of two isoprene units are bonded to each other. Mark that bond in the structure. It will appear green when you highlight it.
