Differences in Fermentation Between Cell Types
The second stage of fermentation differs between plant/fungal cells and animal cells. This distinction is crucial for answering Nat 5 Biology respiration questions and understanding the word equation for fermentation in animal cells.
Plant and Fungal Cells (Alcoholic Fermentation):
- Pyruvic acid is broken down into ethanol and carbon dioxide
- The process is irreversible
- No additional ATP is produced
Animal Cells (Lactic Acid Fermentation):
- Pyruvic acid is broken down into lactate (lactic acid)
- The process is reversible
- No additional ATP is produced
Highlight: In animal cells, once enough oxygen becomes available, lactate can be converted back to pyruvic acid for aerobic respiration.
Example: The fermentation equation for plant cells is: Glucose → Ethanol + Carbon dioxide + ATP
Example: The word equation for fermentation of yeast (a fungal cell) is the same as for plant cells.
Understanding the structure of ATP is essential for comprehending how energy is stored and utilized in cells. ATP consists of an adenosine molecule bonded to three phosphate groups. When energy is needed, the bond between the second and third phosphate groups is broken, releasing energy and converting ATP to ADP (adenosine diphosphate).
This detailed explanation of respiration and fermentation provides a comprehensive overview for students studying enzymes used in respiration a level Biology and helps answer Nat 5 Biology respiration questions. It also clarifies the differences between aerobic and anaerobic respiration, which is crucial for understanding cellular energy production in various organisms and conditions.
