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Edexcel IAL Biology 7.2 Aerobic and anaerobic glycolysis

Locate glycolysis in the cytoplasm, track ATP and reduced NAD, then distinguish mitochondrial entry from reduction of pyruvate to lactate and NAD regeneration.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
A2

Exam points

  • Identify the cytoplasm as the site of glycolysis from pathway or location evidence.
  • Explain ATP formation by substrate-level phosphorylation during glycolysis.
  • Trace pyruvate reduction to lactate and regeneration of NAD without oxygen.

7.2—Glycolysis in aerobic and anaerobic respiration question 1

[Maximum number: 6]

Animals use aerobic and anaerobic respiration to produce ATP.

*(c) The photograph shows a crocodile (Crocodylus porosus) that lives in saltwater habitats.

Figure for Question 7.2—Glycolysis in aerobic and anaerobic respiration question 1 — Edexcel A-Level Biology A2

An investigation measured the lactate production rate of these crocodiles when they were active.

The graph shows the results of this investigation.

Lactate production rate /μmolmin⁡−1 g−1/ \mu \mathrm{mol} \min ^{-1} \mathrm{~g}^{-1}

Figure for Question 7.2—Glycolysis in aerobic and anaerobic respiration question 1 — Edexcel A-Level Biology A2

Each plotted point on the graph represents a single crocodile.
Discuss the roles of the different types of respiration in these active crocodiles.
Use the information in the graph and your own knowledge to support your answer.

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