IB Biology Topic C1.2.17: Differences Between Lipids and Carbohydrates as Respiratory Substrates Notes

Lipids Yield More Energy Per Gram Than Carbohydrates

Lipids yield ~37 kJ/g, while carbohydrates yield ~17 kJ/g.

Lipids have more carbon-hydrogen (C-H) bonds and less oxygen than carbohydrates.

These C-H bonds are highly oxidisable, so they release a lot of energy when broken down in respiration.

Carbohydrates already contain more oxygen, so they are partially oxidised and release less energy per gram.

Hint

More oxidisable hydrogen and carbon means more electrons for the ETC and more ATP per gram.
This is why lipids are ideal for long-term energy storage: they pack more energy into less mass.

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IB Biology Topic C1.2.17: Differences Between Lipids and Carbohydrates as Respiratory Substrates Notes

Lipids Yield More Energy Per Gram Than Carbohydrates

Only Carbohydrates Can Be Respired Anaerobically

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Lipids Yield More Energy Per Gram Than Carbohydrates

Only Carbohydrates Can Be Respired Anaerobically

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C1.2.17: Differences Between Lipids and Carbohydrates as Respiratory Substrates Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Lipids Yield More Energy Per Gram Than Carbohydrates

Only Carbohydrates Can Be Respired Anaerobically

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

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Lipids Yield More Energy Per Gram Than Carbohydrates

Only Carbohydrates Can Be Respired Anaerobically

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

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