This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.

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3.1.1 The organelle in the diagram is a mitochondrion.
3.1.2 Identify part: *a) A: Outer membrane *b) B: Crista (or inner membrane fold)
3.1.3 The carbohydrate that is broken down during cellular respiration is glucose.
3.1.4 Two differences between aerobic and anaerobic respiration:
| Feature | Aerobic Respiration | Anaerobic Respiration | | :------------------ | :------------------------------------------------ | :-------------------------------------------------- | | Oxygen requirement | Requires oxygen | Does not require oxygen | | Energy yield (ATP) | High (approximately 30-32 ATP per glucose) | Low (2 ATP per glucose) |
3.1.5 The Krebs cycle (or citric acid cycle) occurs in the mitochondrial matrix. During this cycle, acetyl-CoA (derived from pyruvate) combines with a 4-carbon molecule to form a 6-carbon molecule. Through a series of reactions, carbon dioxide is released, and energy-carrying molecules such as ATP, NADH, and FADH2 are produced. The 4-carbon molecule is regenerated to continue the cycle, and the NADH and FADH2 proceed to the electron transport chain to generate more ATP.
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This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.