Question

1. _________________ is a series of reaction in which pyruvate is broken down into carbon dioxide.
2. krebs cycle is also called ________________ cycle.
3. the electron transport chain produces ________atp.
4. ______________________ is a type of anaerobic respiration that occurs when there is not enough oxygen available.
5. yeasts produce this product during fermentation: ______________________,
6. humans undergo _____________________ fermentation when muscles do not have enough oxygen.

Explanation:

1. The Krebs cycle (or citric acid cycle) is the series of reactions where pyruvate is broken down into carbon dioxide.
2. The Krebs cycle is also known as the citric acid (or tricarboxylic acid - TCA) cycle.
3. The electron transport chain produces around 32 - 34 ATP (the exact number can vary slightly in different contexts, but a common answer is 32 or 34; sometimes 28 - 32 is also used, but 32 is a typical response for this kind of question).
4. Fermentation (specifically lactic acid fermentation in muscle cells or alcoholic fermentation in yeast, but in general, fermentation is the anaerobic respiration here) is the type of anaerobic respiration when oxygen is low.
5. Yeasts produce ethanol (and carbon dioxide) during fermentation.
6. Humans undergo lactic acid fermentation when muscles lack oxygen.

Answer:

1. Krebs cycle (or Citric Acid Cycle)
2. Citric Acid (or TCA - Tricarboxylic Acid)
3. 32 (or 34, or a range like 28 - 34; 32 is a common answer)
4. Fermentation (or more specifically Lactic Acid Fermentation or Alcoholic Fermentation depending on context, but Fermentation is the general term here)
5. Ethanol (and Carbon Dioxide, but Ethanol is the main product asked here)
6. Lactic Acid