Respiration (OCR A-Level Biology A): Flashcards
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What is a respiratory substrate?
What is a respiratory substrate?
Organic molecule used in respiration to release energy
Energy content of triglycerides (kJ g⁻¹)
Energy content of triglycerides (kJ g⁻¹)
39
Why triglycerides yield more energy than carbohydrates
Why triglycerides yield more energy than carbohydrates
More hydrogen atoms, fewer oxygen atoms per molecule
Effect of more hydrogen atoms on ATP production
Effect of more hydrogen atoms on ATP production
More hydrogen atoms = more ATP produced
Function of β-oxidation pathway
Function of β-oxidation pathway
Converts fatty acids into acetyl groups
When are proteins used as respiratory substrates?
When are proteins used as respiratory substrates?
During starvation or prolonged exercise
Definition of respiratory quotient (RQ)
Definition of respiratory quotient (RQ)
Ratio of CO₂ produced to O₂ consumed per unit time
RQ value for glucose
RQ value for glucose
1.0
RQ value for triglycerides
RQ value for triglycerides
0.7
What does RQ > 1 indicate?
What does RQ > 1 indicate?
Mixture of aerobic and anaerobic respiration