Glycolysi1 - without the use of the electron transport...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Glycolysis During glycolysis, glucose (C 6 ) is broken down to two molecules of pyruvate (C 3 ). (Note that compounds that end in "___ate" can be called "___ic acid". For example, lactate is lactic acid and malate is malic acid.) Glycolysis occurs in the cytoplasm ( cytosol ) and does not require oxygen. There are ten steps in glycolysis and each one is catalyzed by a specific enzyme. A brief summary of these reactions is presented here. 2 ATP molecules are used to phosphorylate and activate compounds that will eventually become converted to pyruvate (or pyruvic acid ) (see diagram below). Two hydrogen atoms are removed by NAD + forming 2 NADH (see diagram). Additional phosphorylation results in intermediate 3-carbon molecules with 2 phosphate groups. Four ATP are produced by substrate-level phosphorylation . Recall that substrate-level phosphorylation is the production of ATP using energy from other high-energy compounds but
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: without the use of the electron transport system in the mitochondria. The net yield of ATP in glycolysis is 2 for each glucose molecule (2 are used but 4 are produced). Some bacteria have alternative energy-producing reactions. Two of these are the pentose phosphate pathway and the Entner-Doudoroff pathway. Formation of Acetyl CoA Pyruvate produced by glycolysis (see above) enters the mitochondrion and is converted to acetyl CoA by the reaction below. The remainder of the reactions of cellular respiration occur in the mitochondrion . pyruvate (C 3 ) → acetyl CoA (C 2 ) + CO 2 During this step, NADH is produced from NAD + + 2H (oxidation). This step must occur twice for each glucose molecule because each glucose molecule produces two pyruvate molecules in glycolysis (above). The two-carbon compound produced is attached to Coenzyme A to produce acetyl CoA....
View Full Document

This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

Page1 / 2

Glycolysi1 - without the use of the electron transport...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online