Multiple Choice
Which of the following is another name for biomolecules?
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4. Biomolecules
Introduction to Biomolecules
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Which statement best describes the composition of milk?
A
Milk is a mixture containing many different substances, such as proteins, fats, carbohydrates, vitamins, and minerals.
B
Milk consists only of water and does not contain any other components.
C
Milk is a pure substance made up of only one type of molecule.
D
Milk is a homogeneous element found naturally in animals.
Verified step by step guidance1
Understand the definition of a mixture: A mixture is a combination of two or more substances that are physically combined but not chemically bonded. Each component retains its own properties.
Analyze the composition of milk: Milk contains proteins (e.g., casein and whey), fats (e.g., triglycerides), carbohydrates (e.g., lactose), vitamins (e.g., vitamin D), minerals (e.g., calcium), and water. These components are not chemically bonded but are physically mixed.
Eliminate incorrect options: Milk is not a pure substance because it contains multiple types of molecules. It is not composed only of water, as it has other components. Milk is not an element, as elements are made of only one type of atom.
Identify the correct description: Milk is a mixture because it contains various substances combined physically, and these substances can be separated by physical means (e.g., centrifugation to separate cream).
Conclude that the best description of milk is: 'Milk is a mixture containing many different substances, such as proteins, fats, carbohydrates, vitamins, and minerals.'
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