Cellular Respiration and Mitochondrion Overview
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Questions and Answers

What is cellular respiration?

Breaking down of organic compounds (glucose) with the gradual release of energy stored in ATP molecules.

Where does cellular respiration occur?

Mitochondrion

What are the main functions of cellular respiration?

Growth, cell division, digestion, movement

What are the three main groups of reactions in cellular respiration?

<p>Glycolysis, The Krebs Cycle, Oxidative phosphorylation</p> Signup and view all the answers

Where does glycolysis occur?

<p>In the cytoplasm outside the mitochondrion</p> Signup and view all the answers

How many ATP molecules are produced in glycolysis?

<p>4 ATP</p> Signup and view all the answers

What is the initial compound that enters the mitochondrion in the Krebs Cycle?

<p>Pyruvic acid</p> Signup and view all the answers

How many carbon dioxide molecules are removed at each stage of the Krebs Cycle?

<p>Two</p> Signup and view all the answers

What happens to the carbon dioxide formed in the Krebs Cycle?

<p>Leaves the cell as a product of cellular respiration</p> Signup and view all the answers

What do the energy-rich hydrogen atoms released during the Krebs Cycle combine with?

<p>Co-enzyme (NAD)</p> Signup and view all the answers

How many molecules of pyruvic acid are formed from each molecule of glucose during glycolysis?

<p>Two</p> Signup and view all the answers

How many turns of the Krebs Cycle are necessary to change a glucose molecule into 6 carbon dioxide molecules and hydrogen?

<p>Two</p> Signup and view all the answers

What is the net gain of ATP from each glucose molecule during glycolysis?

<p>2 ATP</p> Signup and view all the answers

What is the high-energy compound formed when a glucose molecule is converted to a C6 diphosphate compound?

<p>C6 diphosphate compound</p> Signup and view all the answers

What happens to the C6 diphosphate compound during glycolysis?

<p>Broken up into two molecules of a C3 compound (PGAL)</p> Signup and view all the answers

What happens to the high-energy hydrogen atoms in the C3 compounds during glycolysis?

<p>Removed and transferred to a co-enzyme, NAD</p> Signup and view all the answers

How many high-energy hydrogen atoms are removed during glycolysis for the formation of ATP molecules?

<p>FOUR</p> Signup and view all the answers

What is the fate of the two molecules of pyruvic acid remaining at the end of glycolysis?

<p>Further breakdown into carbon dioxide and water in the Krebs Cycle</p> Signup and view all the answers

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