Lesson 1: Respiration
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What is “cellular respiration?”
• Cellular respiration is an exothermic reaction which is continuously occurring in living cells. • Energy released supplies all energy needed for living processes.
What type of reaction is respiration?
• Exothermic • Releases energy
What is the energy released/ transferred from respiration used for?
• It is used for all living processes: • Chemical reactions to build larger molecules ie. building up amino acids –> proteins. • Muscle contraction (movement) • To keep warm.
What is the difference between aerobic and anaerobic respiration?
• Aerobic (with oxygen.) • Anaerobic (without oxygen.)
What is the symbol equation for respiration?
C₆H₁₂O₆ + 6O₂ –> 6CO₂ + 6H₂O
Which releases more energy: aerobic/ anaerobic respiration? Why…?
• Aerobic • The glucose molecule has been fully oxidised.
What is the word equation for anaerobic respiration in muscle cells?
Glucose –> lactic acid
Why is less energy released in anaerobic respiration?
• As the oxidation of glucose is incomplete in anaerobic respiration.
What is the word equation for anaerobic respiration in plant and yeast cells?
• glucose –> Carbon dioxide + ethanol
What is anaerobic respiration in yeast cells known as?
• Fermentation
Why does fermentation have economic importance?
• It is used in the manufacture of bread and alcoholic drinks.