Energy can also be transported by other carrier molecules. Energy produced by exergonic reactions can be stored in electrons. These electrons are captured by electron carriers (a common one is nicotinamide adenine dinucleotide, NAD⁺).

Figure 1: Electron Cariers image taken from Biology, 5th ed. Audesirk

As well as electrons Hydrogen atoms are often picked up as well.

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Basic facts: http://homepages.ius.edu/GKIRCHNE/biomolec.htm