1 / 12

Cellular Respiration Chemical Pathways Section 9-1

Cellular Respiration Chemical Pathways Section 9-1. Flora Biology I. Chemical Energy and Food. Lots of energy present in food (glucose/other compounds) Ex: 1 gram glucose = 3811 calories Calorie – amount of energy required to raise one gram of water, one Celsius degree

niveditha
Download Presentation

Cellular Respiration Chemical Pathways Section 9-1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Cellular RespirationChemical PathwaysSection 9-1 Flora Biology I

  2. Chemical Energy and Food • Lots of energy present in food (glucose/other compounds) • Ex: 1 gram glucose = 3811 calories • Calorie – amount of energy required to raise one gram of water, one Celsius degree • Cells release the energy in glucose and other food compounds

  3. Overview of Cellular Respiration • “reverse photosynthesis” • 6O2 + C6H12O6 → 6CO2 + 6H2O + energy • Cellular respiration – process of breaking down glucose and other food molecule in the presence of “oxygen” • Figure 9-2 (page 222)

  4. Cellular Respiration

  5. Glycolysis • Glycolysis – one molecule of glucose is broken in half, producing two molecules of pyruvic acid and a 3-carbon compound • See figure 9-3(page 223)

  6. Glycolysis • Key concepts: • Occurs in the cytoplasm of cell • No oxygen required for glycolysis to occur • Glucose is broken down into two 3-carbon pyruvates (pyruvic acid) • Net production of 2 ATP, 2 NADH, and 2 pyruvate molecules

  7. Fermentation • Cellular respiration will NOT occur (Krebs and ETC) if oxygen is not present • If oxygen is not present, fermentation will occur • Fermentation – releasing of energy from food molecules by producing ATP in the absence of oxygen

  8. 2 Types of Fermentation • Alcoholic • Lactic acid

  9. Alcoholic Fermentation • Pyruvic acid + NADH → alcohol + CO2 + NAD • Causes bread to rise • “anaerobic” – no oxygen present

  10. Lactic Acid Fermentation • Pyruvic acid is converted into lactic acid • Pyruvic acid + NADH → lactic acid + NAD • Ex: muscle cells • Not enough ATP produced to lack of oxygen • Cells begin to produce ATP by lactic acid fermentation

More Related