24 Questions
What is the primary source of energy for living cells?
Oxidation of carbohydrates and lipids
What is the purpose of the redox chain in living cells?
To liberate energy in small, usable amounts
What has the highest electron affinity?
Oxygen
What is the final common pathway for electron transfer in aerobic cells?
Respiratory chain (Electron transport chain)
What is the byproduct of the reaction between hydrogen and oxygen?
Water and energy
What is the purpose of the electron transport chain?
To generate ATP
What is the role of NADH+ and FADH2 in cellular respiration?
To give hydrogen and electrons to the electron transport chain
Why is it necessary to transfer hydrogen in steps through the redox chain?
To prevent damage to living cells
What happens to the protons pumped through Complexes I, III, and IV?
They accumulate in the inter-membrane space, creating a pH gradient
What is the role of Complex V in the electron transport chain?
To generate ATP from ADP and Pi
What is the net result of oxidative phosphorylation from NADH?
3 ATP are generated
What is the effect of inhibitors of the electron transport chain?
They prevent the passage of electrons
What is the site of action for antimycin A?
Complex III
What is the function of F0-F1 channel in ATP synthase?
To allow protons to enter the ATP synthase
What is the effect of uncouplers on oxidative phosphorylation?
They allow oxidation but prevent phosphorylation
What is the net result of oxidative phosphorylation from FADH2?
2 ATP are generated
What is the final acceptor of electrons and protons in the respiratory chain?
Oxygen
Which enzyme complex is also known as ATP synthase?
Complex V
Which coenzyme is associated with Complex II?
FAD
What is formed when electrons combine with oxygen and protons?
Water
Which enzyme is found in Complex I?
NADH dehydrogenase
Which complex contains cytochrome a + a3?
Complex IV
What is the role of cytochrome C oxidase in the electron transport chain?
Transfer electrons to oxygen
What is the result of coupling oxidation and phosphorylation in the electron transport chain?
ATP synthesis
This quiz covers the process of biological oxidation, energy production in living cells, and redox reactions. It explains how energy is derived from the oxidation of carbohydrates, lipids, and proteins, and how it is converted into ATP.
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