Final answer:
NAD+/NADH and NADP/NADPH are molecules involved in energy-carrying reactions in cells. NAD+ and NADH are involved in cellular respiration, while NADP+ and NADPH play a role in photosynthesis.
Step-by-step explanation:
NAD+/NADH and NADP/NADPH are molecules involved in energy-carrying reactions in cells.
NAD+ and NADH are involved in cellular respiration. NAD+ accepts electrons and hydrogen ions and becomes reduced to NADH. NADH carries these electrons to the electron transport chain, where they are used to generate ATP.
NADP+ and NADPH play a role in photosynthesis. NADP+ accepts electrons and hydrogen ions, becoming reduced to NADPH. NADPH carries these electrons to the Calvin cycle, where they are used to convert carbon dioxide into sugars.