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Dairy Product Science: Delving into the Chemical and Biological Processes Involved in Dairy Production

Description: Dairy Product Science: Delving into the Chemical and Biological Processes Involved in Dairy Production
Number of Questions: 15
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Tags: dairy science chemistry biology food production
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What is the primary protein found in milk?

  1. Casein

  2. Albumin

  3. Globulin

  4. Lactoferrin


Correct Option: A
Explanation:

Casein is the predominant protein in milk, accounting for approximately 80% of the total protein content.

Which enzyme is responsible for the hydrolysis of lactose into glucose and galactose during milk digestion?

  1. Lactase

  2. Amylase

  3. Protease

  4. Lipase


Correct Option: A
Explanation:

Lactase is the enzyme that breaks down lactose, the sugar found in milk, into its component sugars, glucose and galactose.

What is the process by which milk is converted into yogurt?

  1. Fermentation

  2. Pasteurization

  3. Homogenization

  4. Ultrafiltration


Correct Option: A
Explanation:

Yogurt is produced through fermentation, a process in which bacteria convert lactose into lactic acid, resulting in the characteristic tangy flavor and thick texture.

Which vitamin is naturally present in milk and essential for bone health?

  1. Vitamin A

  2. Vitamin C

  3. Vitamin D

  4. Vitamin E


Correct Option: C
Explanation:

Milk is a natural source of vitamin D, which plays a crucial role in calcium absorption and bone mineralization.

What is the main lipid component of milk fat?

  1. Triglycerides

  2. Phospholipids

  3. Sterols

  4. Fatty acids


Correct Option: A
Explanation:

Triglycerides are the primary lipid component of milk fat, constituting approximately 98% of its total fat content.

Which process is employed to remove impurities and microorganisms from milk?

  1. Pasteurization

  2. Homogenization

  3. Ultrafiltration

  4. Deodorization


Correct Option: A
Explanation:

Pasteurization is a heat treatment process used to eliminate harmful microorganisms from milk, ensuring its safety for consumption.

What is the primary function of homogenization in milk processing?

  1. Breaking down fat globules

  2. Removing lactose

  3. Inactivating enzymes

  4. Adjusting pH levels


Correct Option: A
Explanation:

Homogenization is a mechanical process that breaks down fat globules in milk, resulting in a more uniform and stable emulsion.

Which component of milk is responsible for its characteristic yellow color?

  1. Carotene

  2. Riboflavin

  3. Thiamine

  4. Vitamin D


Correct Option: A
Explanation:

Carotene, a fat-soluble pigment, is responsible for the yellow color of milk and is derived from the cow's diet.

What is the process of converting milk into cheese?

  1. Fermentation

  2. Pasteurization

  3. Homogenization

  4. Ultrafiltration


Correct Option: A
Explanation:

Cheese is produced through fermentation, a process in which bacteria or molds convert lactose into lactic acid and other compounds, resulting in the coagulation of milk proteins and the formation of cheese curds.

Which enzyme is responsible for the breakdown of casein during cheese ripening?

  1. Rennet

  2. Lactase

  3. Protease

  4. Lipase


Correct Option: C
Explanation:

Proteases are enzymes that break down proteins, including casein, during the ripening process of cheese, contributing to its flavor and texture development.

What is the primary function of starter cultures in yogurt production?

  1. Fermenting lactose

  2. Producing carbon dioxide

  3. Inhibiting spoilage microorganisms

  4. Enhancing flavor and aroma


Correct Option: A
Explanation:

Starter cultures, consisting of specific bacteria, are added to milk during yogurt production to ferment lactose into lactic acid, resulting in the characteristic tangy flavor and thick texture of yogurt.

Which process is employed to remove water from milk, resulting in concentrated milk products?

  1. Evaporation

  2. Pasteurization

  3. Homogenization

  4. Ultrafiltration


Correct Option: A
Explanation:

Evaporation is a process that involves the removal of water from milk through heating, resulting in concentrated milk products such as evaporated milk and condensed milk.

What is the primary function of rennet in cheese production?

  1. Coagulating milk proteins

  2. Fermenting lactose

  3. Breaking down fat globules

  4. Adjusting pH levels


Correct Option: A
Explanation:

Rennet, an enzyme derived from animal or microbial sources, is used in cheese production to coagulate milk proteins, forming a semi-solid curd that is further processed to produce cheese.

Which process is employed to separate cream from milk?

  1. Centrifugation

  2. Pasteurization

  3. Homogenization

  4. Ultrafiltration


Correct Option: A
Explanation:

Centrifugation is a process that utilizes centrifugal force to separate cream, which contains a higher fat content, from the skimmed milk.

What is the primary function of lactic acid bacteria in cheese production?

  1. Fermenting lactose

  2. Producing carbon dioxide

  3. Inhibiting spoilage microorganisms

  4. Enhancing flavor and aroma


Correct Option: A
Explanation:

Lactic acid bacteria, commonly used in cheese production, ferment lactose into lactic acid, resulting in the characteristic tangy flavor and firm texture of cheese.

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