Energy and Respiration

Front

What is the primary need for energy in living organisms?

Back

All living organisms need a constant supply of energy to stay alive, which is required for work, active transport, movement, and anabolic reactions.

Front

What is ATP and why is it considered the universal energy currency?

Back

ATP (adenosine triphosphate) is a small, soluble molecule that provides a short-term store of chemical energy for cells. It is used in all organisms and can be reused for different reactions.

Front

How is ATP synthesized?

Back

ATP is synthesized through substrate-linked phosphorylation and chemiosmosis.

Front

What is substrate-linked phosphorylation?

Back

It is the process where a phosphate group is directly transferred from a substrate molecule to ADP to form ATP, using energy from another chemical reaction.

Front

What is chemiosmosis?

Back

Chemiosmosis involves a proton gradient across a membrane, where energy released by moving protons down the gradient is used to synthesize ATP via ATP synthase.

Front

What are the two types of ATP synthesis?

Back

1. Substrate-linked phosphorylation 2. Chemiosmosis.

Front

What is the role of the sodium-potassium pump in active transport?

Back

The sodium-potassium pump uses ATP to transport sodium out of the cell and potassium into the cell against their concentration gradients.

Front

What is the significance of ATP hydrolysis?

Back

ATP hydrolysis releases energy that can be used for various cellular processes, and it can be carried out quickly and easily by the enzyme ATPase.

Front

What are the benefits of ATP being a stable molecule?

Back

ATP does not break down unless a catalyst (ATPase) is present, preventing energy wastage.

Front

What happens during the hydrolysis of ATP?

Back

ATP is broken down into ADP (adenosine diphosphate) and inorganic phosphate (Pi), releasing energy.