8 The passage below outlines the structure of the mitochondrion. Complete the passage by using the most appropriate scientific term(s). The mitochondrion is found in eukaryotic cells. It is bound by a double membrane. The outer membrane is permeable to pyruvate, which is the main product of **....................................................................................................................................** . The inner membrane is folded to form **...................................................................................** , which increase the surface area of the membrane. Embedded in the inner membrane are the carrier proteins of the electron transport chain and the protein complex responsible for ATP production, known as **............................................................................................................** . Electron flow leads to the build-up of a large concentration of **...................................................** in the intermembrane space due to the activity of the electron transport chain. The **................................................................................................................** of the mitochondrion, which contains enzymes, is the site of the link reaction and the **................................................................................................................** .

1. passageThe mitochondrion is found in eukaryotic cells. It is bound by a double membrane. The outer membrane is permeable to pyruvate, which is the main product of **glycolysis** . The inner membrane is folded to form **cristae** , which increase the surface area of the membrane. Embedded in the inner membrane are the carrier proteins of the electron transport chain and the protein complex responsible for ATP production, known as **ATP synthase** . Electron flow leads to the build-up of a large concentration of **protons / hydrogen ions / H+** in the intermembrane space due to the activity of the electron transport chain. The **matrix** of the mitochondrion, which contains enzymes, is the site of the link reaction and the **Krebs / TCA / citric acid, cycle** .[6]