1. Topic 8.2 Cellular Respiration (AHL)

5. How does this work?

29. Anaerobic Respiration
Depending on the presence of oxygen, the process of respiration can continue in one of two ways – Anaerobic or Aerobic
Glucose
NO O2
With O2
Glycolysis
Anaerobic Respiration
Cytoplasm
Aerobic Respiration
Mitochondria
Pyruvate
2 ATP
Animals:
Lactic Acid
Plants:
Ethanol and CO2
CO2 and H2O
36-38 ATP
Oxygen acts as a “key” molecule during the next stage, the link reaction. Without oxygen present, we can not enter the mitochondria.

30. Anaerobic respiration produces ethanol and carbon dioxide in yeast (and many other organisms.) This can go on to be processed into biofuel or alcoholic beverages.
Anaerobic respiration produces Lactic Acid in humans, rather than ethanol.
The production of lactic acid can build up in the blood of people as they work, leading to acidification of the blood and cramping.

71. This respirometer measures the amount of oxygen consumed by the seeds.
Respirometers provide a way to measure the amount of cellular respiration occurring in a scenario.
This respirometer measures the amount of oxygen consumed by the seeds.
Use of oxygen and production of CO2 leads to no change in volume, but the CO2 is absorbed by the alkali, so the volume of gas in the respirometer decreases.
The liquid plug prevents CO2 from moving between chambers, and pressure changes will lead to movement of the oil towards the chamber that has less pressure.
Seeds performing respiration
Potassium Hydroxide solution absorbs carbon dioxide in the atmosphere.

90. Fermentation Inquiry
Research one of the following types of popular foods and understand the role of fermentation in the creation of said food:
Key Components:
Starting Raw Material – Reactants of Respiration
General Process
Length of Time in Production
Named Bacteria
End Products of Respiration
Potential Foods:
Tempeh
Chocolate
Kimchi
Kombucha
Yogurt
Kefir
Natto
Masato