OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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What does 'anaerobic' mean?

  1. "Without energy"

  2. "With air"

  3. "With oxygen"

  4. "Without oxygen"

The correct answer is: "Without oxygen"

'Anaerobic' refers to processes that occur in the absence of oxygen. This term is commonly used in the context of respiration, where cells can generate energy without relying on oxygen. Anaerobic respiration is particularly important in certain organisms and conditions, such as in muscle cells during intense exercise or in the metabolic processes of some bacteria and yeasts. The correct answer highlights the significance of oxygen levels in cellular processes. While aerobic respiration—occurring in the presence of oxygen—allows for more efficient energy production, anaerobic processes fulfill the energy needs of organisms when oxygen is scarce or unavailable.

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