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Chapter 17: Problem 15

For each of the following metabolic pathways, describe where in the cell it occurs and identify the starting material and end product(s): a. Citric acid cycle b. Glycolysis c. Oxidative phosphorylation d. Fatty acid synthesis

Short Answer

Expert verified
The citric acid cycle which occurs in the mitochondrial matrix converts Acetyl CoA into CO2 and NADH. Glycolysis takes place in cytoplasm, and it converts glucose into pyruvate, ATP and NADH. Oxidative phosphorylation, located in mitochondria, uses NADH and FADH2 to produce ATP and water. Fatty acid synthesis occurs in the cytoplasm, starting with acetyl-CoA and malonyl-CoA, and forming saturated fatty acid, palmitate.

Step by step solution

01

Citric Acid Cycle

The Citric acid cycle, also known as the Krebs cycle occurs in the matrix of the mitochondria in a cell. It starts with the compound called Acetyl-CoA, which combines with oxaloacetate to produce citrate. This cycle ends with the production of Carbon dioxide (CO2) and Reduced forms of NADH and FADH2.
02

Glycolysis

Glycolysis takes place in the cytoplasm of the cell. It starts with a glucose molecule, which is converted, through a series of enzymatic reactions into two molecules of pyruvate. The process produces ATP (adenosine triphosphate) and NADH, which are forms of energy.
03

Oxidative Phosphorylation

Oxidative phosphorylation occurs within the mitochondria. The starting materials are NADH and FADH2, which are produced during the citric acid cycle. The end products are ATP and water.
04

Fatty Acid Synthesis

Fatty acid synthesis happens in the cytoplasm of the cell. The process starts with acetyl-CoA and malonyl-CoA. The end product is palmitate, a saturated fatty acid.

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