Final answer:
The incorrect statement about cellular redox reactions is that they always release oxygen as a byproduct. Cellular redox reactions are key for energy production and involve the transfer of electrons without necessarily releasing oxygen.
Step-by-step explanation:
The statement that is not true of most cellular redox reactions is D. Cellular redox reactions always release oxygen as a byproduct. In cellular redox reactions, electrons are transferred between molecules, which is a process essential for energy production within cells. Cellular redox reactions often involve the transfer of electrons through a number of electron carriers, including some derived from B vitamins. Oxidation refers to the loss of electrons, and reduction is the gain of electrons. These reactions are characterized by the mnemonic OIL RIG. Cellular redox reactions include processes like cellular respiration, where biochemical energy is transformed into ATP, generally not releasing oxygen as a byproduct. Instead, this process is associated with the production of carbon dioxide and water, particularly in the final stages of the electron transport chain.