CIE A Level Biology復習筆記12.2.5 Aerobic Respiration: The Krebs Cycle
Aerobic Respiration: Outline of the Krebs Cycle
- The Krebs cycle (sometimes called the citric acid cycle) consists of a?series of enzyme-controlled reactions
- Acetyl CoA (2C) enters?the circular pathway via the?link reaction
- 4 carbon (4C) oxaloacetate accepts the 2C acetyl fragment from acetyl CoA to form citrate (6C)
- Citrate is then converted back to oxaloacetate?through a series of small reactions
The regeneration of oxaloacetate
Aerobic Respiration: The Krebs Cycle
The steps in the Krebs cycle
- Oxaloacetate is regenerated?in the Krebs cycle through a series of reactions
- Decarboxylation of citrate
- Releasing?2 CO2?as waste gas
- Dehydrogenation of citrate
- Releasing H atoms that reduce coenzymes NAD and FAD
- 8H + 3NAD + FAD →?3NADH + 3H+?+ FADH2
- Substrate-level phosphorylation
- A phosphate is transferred from one of the intermediates to ADP, forming?1 ATP
The Krebs cycle
Exam Tip
It is a good idea to learn the Krebs cycle in detail. You may be asked to name the important molecules in the Krebs cycle like oxaloacetate. It is also worth noting how the?number of carbon atoms?in the substrate molecule changes as the cycle progresses.
轉載自savemyexams
以上就是關于【CIE A Level Biology復習筆記12.2.5 Aerobic Respiration: The Krebs Cycle】的解答，如需了解學校/賽事/課程動態，可至翰林教育官網獲取更多信息。
往期文章閱讀推薦：
MIT官方發布【2026年夏季推薦閱讀書單】！橫跨科學/人文/經濟...
全網破防！ALevel CIE數學M1疑似錯題？經濟P2難度飆升？5月6日大考考情分析必看！
翰林AMC8視頻課重磅上線！
國際競賽真題資源免費領取
