Questions and Answers
Which of the following substances is classified as a lipid?
The MOST common lipids found in food are:
The body stores lipids as:
A triglyceride is comprised of:
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Triglycerides can be classified by which of the following characteristics?
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A fatty acid comprised of a 10-carbon chain and one double bond is characterized as a:
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A fatty acid comprised of a 16-carbon chain with no points of unsaturation is called a(n):
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Which of the following fatty acids is typically solid at room temperature?
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Which of the following foods is BEST characterized as a rich source of saturated fatty acids?
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Which of the following is BEST characterized as a rich source of polyunsaturated fatty acids?
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The process of adding hydrogen to an unsaturated fatty acid is called:
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Diets high in trans fatty acids are MOST associated with:
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Which of the following statements is true about trans fatty acids?
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Which of the following ingredients would alert you to the presence of trans fatty acids in a food product?
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Essential fatty acids (EFAs) are precursors needed to produce which type of biological compounds?
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Which essential fatty acid plays an important role in reducing a person's risk for heart disease?
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The two essential fatty acids are:
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Which of the following foods is the richest source of omega-3 fatty acids?
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Why are phospholipids NOT considered to be essential nutrients?
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Which type(s) of phospholipids act as an emulsifier?
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Study Notes
Lipids and Their Classification
- Lipids include substances such as sterols, triglycerides, and phospholipids.
- The most common lipids in food are triglycerides, which the body stores as fat.
- A triglyceride consists of three fatty acids and one glycerol molecule.
Characteristics of Triglycerides
- Triglycerides can be categorized based on the shape, length, and saturation of their fatty acids.
- Fatty acids can vary in chain length and saturation, affecting their properties and behavior in the body.
Types of Fatty Acids
- Monounsaturated fatty acids, such as those with a 10-carbon chain and one double bond, have beneficial health effects.
- Saturated long-chain fatty acids contain no double bonds and are typically solid at room temperature.
Sources of Fatty Acids
- Foods rich in saturated fatty acids include butter, while corn oil is a prime source of polyunsaturated fatty acids.
- Essential fatty acids include linoleic and alpha-linolenic acid, which play significant roles in heart health.
Trans Fatty Acids
- Trans fatty acids form through hydrogenation, a process that adds hydrogen to unsaturated fatty acids.
- Diets high in trans fatty acids are linked to increased blood cholesterol levels.
- Ingredients like hydrogenated vegetable oil indicate the presence of trans fatty acids in food products.
Role of Essential Fatty Acids
- Essential fatty acids are critical precursors for producing eicosanoids, which are important biological compounds that regulate various body functions.
- Alpha-linolenic acid is particularly noted for its heart-protective properties.
Phospholipids
- Phospholipids are not essential nutrients since the body can manufacture them.
- Lecithins, a type of phospholipid, act as emulsifiers in food, helping to blend ingredients that typically don't mix well.
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Description
Test your knowledge on lipids with this quiz based on Chapter 5 of The Science of Nutrition. You'll answer questions about various types of lipids, their functions, and their roles in the body. Perfect for students looking to reinforce their understanding!
