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02 - Food consumption and energy Why do we eat food GET...

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Food consumption and energy Why do we eat food? - GET ENERGY Why do we need energy? - Nearly all metabolic reactions require energy (ATP)
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How can cells convert food energy to ATP? - All cells make ATP by breaking down organic compounds - Glucose is the major energy source - Extract energy from glucose by aerobic respiration
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Overview of aerobic respiration 1. Glycolysis (Glucose Æ Pyruvate) 2. Krebs cycle (Pyruvate Æ Carbon dioxide) 3. Electron transfer reaction (NADH and FADH 2 Æ ATPs) Glycolysis Krebs cycle Electron transfer reaction 36 ATP + 2 GTP 36 6
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1. Glycolysis - Break down 1 glucose (6-carbon) into 2 pyruvate (3 carbon) - Take place in cytoplasm Net yield: 2 ATP 2 NADH End product: 2 pyruvate Glucose P -Glucose 2 pyruvate
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GDP GTP 2. Krebs cycle - Breaks down pyruvate into carbon dioxide - Occurs at the inner compartment of the mitochondria - Produces NADH and FADH 2 Preparatory steps: - One C atom stripped from pyruvate and releases as CO 2 - The remaining two carbon atoms form acetyl-CoA - NAD + picks up hydrogen and electrons and forms NADH 4C
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