MCQ
Q.
The souring of milk to curd is an example of
Correct Answer: C
The correct answer is Fermentation.
Key Points
- The name of the process which converts milk into curd is lactic fermentation and in this process, the lactose sugar of the milk is converted into lactic acid by lactic acid bacteria.
- The acid thus produced curdles the milk and gives it a sour taste.
- During the fermentation process, lactose fermenting bacteria utilize lactose of milk to gain energy.
- Fermentation is an enzyme-catalyzed, the metabolic process whereby organisms convert starch or sugar to alcohol or an acid anaerobically releasing energy.
- The science of fermentation is called “zymology”.
- Types of Fermentation
- Homo fermentation: only one type of product formation
- Hetero fermentation: more than one product formed
- Examples of Products Formed by Fermentation
- Beer, Wine, Yogurt, Cheese, Certain sour foods containing lactic acid, including sauerkraut, kimchi, and pepperoni.
- Bread leavening by yeast.
- Sewage treatment.
- Some industrial alcohol production
Additional Information
| Saponification |
The process of making soap is called Saponification. Saponification is the hydrolysis of an ester with NaOH or KOH to give alcohol and sodium or potassium salt of the acid.
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| Putrefaction | Putrefaction involves the decomposition of proteins, breakdown of the tissues, and liquefaction of the organs. |
| Esterification | Esterification is the chemical process that combines alcohol (ROH) and an organic acid (RCOOH) to form an ester (RCOOR) and water. |
