Not breathing! Respiration is the process of releasing energy from food molecules Bacteria and Fungi carry out: - Aerobic respiration ( การหายใจแบบใช้ ออกซิเจน ) - with the presence of oxygen - Anaerobic respiration ( การหายใจแบบไม่ใช้ ออกซิเจน ) -without the presence of oxygen.
Glucose can be respired (used to provide energy) in a similar way to respiration in most other organisms: C 6 H 12 O 6 6O 2 6CO 2 6H 2 O Energy Glucose Oxygen Carbon dioxide Water +++ Cell
If there isn’t enough oxygen available, then fungi can respire anaerobically, still using glucose for example: The energy output from anaerobic respiration is much smaller than for aerobic respiration. C 6 H 12 O 6 2CO 2 2C 2 H 5 OH Energy Glucose Carbon dioxide Ethanol + + Cell
Some bacteria and fungi can produce lactic acid ( กรด น้ำนม ) as a by-product ( ผลิตผลพลอยได้ ) of anaerobic respiration. C 6 H 12 O 6 2CH 3 CH(OH)COOH Energy Glucose Lactic Acid + Cell
Bacteria releasing energy from food molecules Bacteria may undertake either aerobic or anaerobic respiration (depending on the species, and the environment) and may produce alcohol or lactic acid as a by- product.
The special term fermentation ( การหมักดอง ) is used to describe anaerobic respiration of carbohydrates ( คาร์โบไฮเดรต ) to produce an alcohol or acid.
Yeast fermentation produces the ethanol ( เอทา นอล ) which may be used in alcoholic beverages ( แอลกอฮอล์ ). Yeast fermentation produces the carbon dioxide ( ก๊าซคาร์บอนไดออกไซด์ ) that makes bread rise - the alcohol evaporates during baking of the bread. Silage ( อาหารสัตว์ ) is also a product of fermentation, the acid produced preserves surplus grass ( หญ้า ).