Photosynthesis and cellular respiration provide energy for life - - PowerPoint PPT Presentation

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Nov 28, 2023 524 likes •742 views

Photosynthesis and cellular respiration provide energy for life Breathing supplies oxygen to our cells for use in cellular respiration and removes carbon dioxide Cellular respiration banks energy in ATP molecules The human body uses energy

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Photosynthesis and cellular respiration provide energy for life

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Breathing supplies oxygen to our cells for use in cellular respiration and removes carbon dioxide

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Cellular respiration banks energy in ATP molecules

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The human body uses energy from ATP for all its actvivites

Kilocalories (kcal)- An Energy unit, the

quantity of heat required to raise the temperature of 1 kilogram (kg) of water by 1 degree Celsius. degree Celsius.

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Cells tap energy from electrons “falling” from organic fuels to oxygen

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Redox reaction occurring simultaneously

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Overview: Cellular respiration occurs in three main stages

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Glycolysis harvests chemical energy by

xidizing glucose to pyruvate

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Energy investment phase

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Energy payoff phase

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Pyruvate is chemically groomed for the citric acid cycle

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The citric acid cycle completes the oxidation of organic molecules, generating many NADH and FADH2 molecules

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Most ATP production occurs by

xidative phosphorylation

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Certain poisons interrupt critical events in cellular respiration

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Review: Each molecule of glucose yields many molecules of ATP

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Fermentation enables cells to produce ATP without oxygen

Lactic Acid Fermentation Alcohol Fermentation

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Glycolysis evolved early in the history

f life on earth
Glycolysis is the universal energy-harvesting

process of life

Significant levels of O2 did not accumulate in

the atmosphere until about 2.7 billions years the atmosphere until about 2.7 billions years ago

For almost a billion years, prokaryotes must

have generated ATP exclusively from glycolysis, because it does not require O2

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Cells use many kinds of organic molecules as fuel for cellular respiration

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