National 5BiologySQARevision NotesUnit 1: Cell BiologyRespirationComparing Aerobic Respiration and Fermentation

Comparing Aerobic Respiration and Fermentation (SQA National 5 Biology): Revision Note

Exam code: X807 75

Cara Head

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Cara Head

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Comparing aerobic respiration & fermentation

Feature

Fermentation (anaerobic)

Aerobic respiration

Shared first stage

Glucose → two pyruvate (yields a net gain of 2 ATP)

Glucose → two pyruvate (yields a net gain of 2 ATP)

Oxygen availability

Unavailable

Available

Where respiration begins

Cytoplasm

Cytoplasm

Where the pathway is completed

Cytoplasm

Mitochondria

Products

In animals: lactate

In plants & yeast: carbon dioxide and ethanol

Carbon dioxide and water

ATP generated in total

Two ATP molecules

Yields a large number of ATP molecules

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    Cara Head

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    Cara graduated from the University of Exeter in 2005 with a degree in Biological Sciences. She has fifteen years of experience teaching the Sciences at KS3 to KS5, and Psychology at A-Level. Cara has taught in a range of secondary schools across the South West of England before joining the team at SME. Cara is passionate about Biology and creating resources that bring the subject alive and deepen students' understanding