ATP

What does ATP stand for and why is it important for cells?

ATP stands for Adenosine Triphosphate and it serves as the primary energy currency of the cell.

What are the three main components of ATP?

Adenine (a nitrogenous base), Ribose (a five-carbon sugar), and three phosphate groups.

What makes the bonds between the phosphate groups in ATP high-energy?

The electrostatic repulsion between the negatively charged phosphate groups.

How is energy released from ATP?

Energy is released when the terminal phosphate group is removed by hydrolysis, converting ATP into ADP and an inorganic phosphate.

What is the chemical reaction that represents the hydrolysis of ATP?

ATP + H2O → ADP + Pi + Energy.

What are some cellular processes powered by the energy released from ATP?

Muscle contraction, active transport across membranes, synthesis of macromolecules, and nerve impulse transmission.

What are the three mechanisms through which ATP is regenerated from ADP and Pi?

Cellular respiration, photosynthesis, and substrate-level phosphorylation.

Where does cellular respiration mainly take place and what is its predominant method for ATP synthesis?

In the mitochondria, with oxidative phosphorylation as the predominant method.

What happens during glycolysis?

Glycolysis converts one glucose molecule into two pyruvate molecules, generating a small amount of ATP and NADH.

What converts pyruvate into before it enters the Krebs Cycle?

Pyruvate is converted into acetyl-CoA.

What is primarily produced during the Krebs Cycle?

Electron carriers NADH and FADH2, and a small amount of ATP through substrate-level phosphorylation.

What is the main function of the Electron Transport Chain?

It transfers electrons from NADH and FADH2 through protein complexes, driving the pumping of protons to create a protongradient for ATP synthesis.

What enzyme synthesizes ATP during oxidative phosphorylation?

ATP synthase.

In which part of the mitochondria does the Electron Transport Chain occur?

In the inner mitochondrial membrane.