A Level Biology: Lesson 221.

Cellular Respiration: Anaerobic Respiration

Task 1. Check Where this Lesson fits into your Exam Specification!

Task 2. Watch the Revision Notes Lesson in Full.

00:00 Introduction - link to learnbiology.net

00:40 Learning Outcomes

01:16 Two Types of Respiration

02:04 Anaerobic Respiration

02:43 Alcoholic (Ethanol) fermentation

03:41 Lactate (lactic acid) fermentation

04:41 Summary


Check Your Spec!

★ AQA Specification Reference: - 3.5.2 Respiration (A-level only) Respiration produces ATP. Glycolysis is the first stage of anaerobic and aerobic respiration. It occurs in the cytoplasm and is an anaerobic process. If respiration is only anaerobic, pyruvate can be converted to ethanol or lactate using reduced NAD. The oxidised NAD produced in this way can be used in further glycolysis.


★ CIE Specification Reference: - 12.2 Respiration: Respiration is the process whereby energy from complex organic molecules is transferred to ATP. Some organisms and some tissues are able to respire in both aerobic and anaerobic conditions. When yeast and plants respire under anaerobic conditions, they produce ethanol and carbon dioxide as end-products; mammalian muscle tissue produces lactate when oxygen is in short supply. j) distinguish between respiration in aerobic and anaerobic conditions in mammalian tissue and in yeast cells, contrasting the relative energy released by each (a detailed account of the total yield of ATP from the aerobic respiration of glucose is not required). k) explain the production of a small yield of ATP from respiration in anaerobic conditions in yeast and in mammalian muscle tissue.


★ Edexcel (Biology A – Salters-Nuffield) Specification Reference: - Topic 7: Run for your Life: 7.4. Understand the roles of glycolysis in aerobic and anaerobic respiration, including the phosphorylation of hexoses, the production of ATP, reduced coenzyme, pyruvate and lactate (details of intermediate stages and compounds are not required). 7.7 Understand what happens to lactate after a period of anaerobic respiration in animals.


★ Edexcel (Biology B) Specification Reference: - Topic 5: Energy for Biological Processes. 5.5 Anaerobic respiration. Know that anaerobic respiration is the partial breakdown of hexoses (glucose) to produce a limited yield of ATP in the absence of oxygen. ii Understand the difference in ATP yields from one molecule of hexose sugar in aerobic conditions compared with anaerobic conditions. iii Understand how lactate as a by-product of anaerobic respiration affects mammalian muscle contraction. iv Understand how anaerobic respiration in plants results in ethanol formation.


★ OCR (Biology A) Specification Reference: - 5.2.2 Respiration. Respiration is the process whereby energy stored in complex organic molecules is transferred to ATP. ATP provides the immediate source of energy for biological processes. (i) the process of anaerobic respiration in Eukaryotes. To include anaerobic respiration in mammals and yeast and the benefits of being able to respire Anaerobically. Why anaerobic respiration produces a much lower yield of ATP than aerobic respiration.

★ OCR (Biology B) Specification Reference: - 4.1.1 Cellular respiration. An outline of the process of anaerobic respiration in muscle cells and in yeast. To include an appreciation that anaerobic respiration produces a much lower yield of ATP than aerobic respiration.


★ WJEC Specification Reference: - 2.1 component 1. Energy for Life (3) Respiration releases chemical energy in biological processes. (e) The breakdown of glucose under anaerobic conditions.


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