Topic 3 Cellular Respiration: Mitochondria and Chemiosmosis

Question 1

• Outer membrane, intermembrane space (H+ build up), inner membrane (ETC), and mitochondrial matrix (Krebs) are involved in cell respiration

Answer 1

Mitochondria

Question 2

1. Mechanism of ATP generation which occurs when energy is stored in the form of a proton concentration gradient

Answer 2

Step 1 of Chemiosmosis

Question 3

2. Krebs Cycle produces NADH/FADH2 which are oxidized and causes H+ to be transported from mitochondrial matrix to intermembrane space. A pH and electrical charge gradient are created and ATP synthase uses the kinetic energy from the flow of this gradient to create ATP
   - Remember: higher H+ concentration is more acidic pH

Answer 3

Step 2 of Chemiosmosis

Question 4

• RNA nucleotide
• Unstable due to 3 phosphates in ATP being negatively charged and repel. When one phosphate group is removed via hydrolysis, a more stable ADP results. The change from less stable molecule to more always releases energy
• Provides energy for all cells by transferring phosphate from ATP to another molecule

Answer 4

ATP (Adenosine triphosphate)