12 1 respiration

Respiration is a chemical reaction that takes place in living cells. It releases energy from glucose.

Living organisms use the energy released during respiration in many ways, including:

Variables that would need to be controlled in an investigation into the effect of temperature on respiration in yeast include: (Avoid saying 'amount')

An increase in temperature would cause an increase in the rate of respiration in yeast cells. This trend would continue until around 40°C, above which the rate of respiration would slow down due to denaturing enzymes.

Aerobic respiration is a cellular reaction that uses oxygen to break down nutrients in order to release energy.

The word equation for aerobic respiration is: glucose + oxygen → carbon dioxide + water

The reactants in aerobic respiration are glucose and oxygen.

The balanced chemical equation for aerobic respiration is: C6H12O6 + 6O2 → 6CO2 + 6H2O

Anaerobic respiration is the chemical reaction in cells that breaks down nutrient molecules to release energy in the absence of oxygen.

False. Anaerobic respiration releases much less energy per glucose molecule than aerobic respiration.

The word equation for anaerobic respiration in yeast is: glucose → alcohol + carbon dioxide

The balanced chemical equation for anaerobic respiration in yeast is: C6H12O6 → 2C2H5OH + 2CO2

The word equation for anaerobic respiration in muscles is: glucose → lactic acid

The oxygen debt is the oxygen required to remove the build up of lactic acid in muscle cells after anaerobic respiration.

The body deals with the oxygen debt in several ways: