• Energy stored in food
• Amount of energy needed to raise the temperature of 1 gram of water 1 degree Celsius

• The process that releases energy from food in the presence of oxygen

• "in air"
• Pathways of cellular respiration that require oxygen are said to be________.
• The Krebs cycle and electron transport chain are both _______ processes.

• "without air"
• Glycolysis is said to be ______.

• "sugar-breaking"
• involves many chemical steps that transform glucose
• 1 molecule of glucose, 6-carbon compound, is transformed into 2 molecules of pyruvic acid, a 3-carbon compound

• an electron carrier
• nicotinamide adenine dinucleotide

krebs cycle

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• pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions
• British biochemist demonstrated its existence in 1937

matrix

[image]

• the innermost compartment of the mitochondrion
• the site of the Krebs cycle reactions

• In the absence of oxygen, _________ releases energy from food molecules by producing ATP.