Biomolecules electron carriers

Electron carriers Biomolecules, such as NAD and NADP that act to transport energy within cells... 

In addition to its role as an intermediate in cholesterol biosynthesis, isopentenyl pyrophosphate is the activated precursor of a huge array of biomolecules with diverse biological roles (Fig. 21-48). They include vitamins A, E, and K plant pigments such as carotene and the phytol chain of chlorophyll natural rubber many essential oils (such as the fragrant principles of lemon oil, eucalyptus, and musk) insect juvenile hormone, which controls metamorphosis dolichols, which serve as lipid-soluble carriers in complex polysaccharide synthesis and ubiquinone and plastoquinone, electron carriers in mitochondria and chloroplasts. Collectively, these molecules are called isoprenoids. More than... 

Hydrogen (H) is present in all biomolecules, linked to C, N, O and S, Removal of H is equivalent to oxidation when the H is combined with Oj by operation of the electron transport chain of respiring cells, ATP is generated. In most biological reactions, H participates as the ion H + e" the coenzymes NADH and NADPH are carriers of H + 2e (equivalent to a hydride ion). Reactions involving Hj are rare (see Hydrogen metabolism). 

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