5 Questions
What is the first stop in the stepwise cascade of electrons during cellular respiration?
NAD+
What is the molecule at the bottom of the electron transport chain that finally drops the electrons to oxygen?
Water
What is the function of oxygen in the electron transport chain?
To act as a final electron acceptor
Which part of the mitochondria are the molecules of the electron transport chain built into?
The inner membrane
What happens to the energy of electrons during the stepwise cascade in cellular respiration?
It is lost at each step
Study Notes
- Electrons gathered from food molecules "fall" in a stepwise cascade during cellular respiration, losing energy at each step.
- NAD+ is the first stop in the path down the cascade.
- The rest of the cascade consists of an electron transport chain, each link being a molecule, usually a protein.
- With each transfer in the chain, electrons give up a small amount of energy that can be used indirectly to generate ATP.
- The first molecule of the chain accepts electrons from NADH.
- The electrons cascade down the chain, from molecule to molecule.
- The molecule at the bottom of the chain finally "drops" the electrons to oxygen, forming water.
- The overall effect of all this transfer of electrons during cellular respiration is a "downward" trip for electrons from glucose to NADH to an electron transport chain to oxygen.
- Oxygen functions as a final electron acceptor, pulling electrons down the transport chain from fuel molecules.
- The molecules of electron transport chains are built into the inner membranes of mitochondria.
"Take our quiz on Cellular Respiration Electron Transport Chain and learn about the journey of electrons from food to ATP production. Understand the role of NAD+ and oxygen in the cascade, and uncover the molecules involved in the electron transport chain. Test your knowledge on how these processes take place within the mitochondria and how it all contributes to energy production. Get ready to dive into the fascinating world of cellular respiration!"
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