Podcast
Questions and Answers
Which of the following best describes the defining characteristic of lipids?
Which of the following best describes the defining characteristic of lipids?
- Composed primarily of amino acids.
- Comprise a diverse group of water-insoluble molecules. (correct)
- Soluble in water.
- Include only fatty acids.
Fatty acids are the only type of lipid.
Fatty acids are the only type of lipid.
False (B)
What two structural components are present in all fatty acids?
What two structural components are present in all fatty acids?
carboxyl group and alkyl chain
In the systematic symbolic representation of fatty acids, the number after the colon indicates the number of ________.
In the systematic symbolic representation of fatty acids, the number after the colon indicates the number of ________.
What does the notation 16:2 Δ9,12 indicate about a fatty acid?
What does the notation 16:2 Δ9,12 indicate about a fatty acid?
The double bonds in fatty acids are typically trans.
The double bonds in fatty acids are typically trans.
How does the presence of cis double bonds affect the packing of fatty acids?
How does the presence of cis double bonds affect the packing of fatty acids?
Compared to saturated fatty acids, polyunsaturated fatty acids have ________ melting points.
Compared to saturated fatty acids, polyunsaturated fatty acids have ________ melting points.
Which of the following is the primary storage form of fatty acids?
Which of the following is the primary storage form of fatty acids?
Fatty acids are stored in the liver as triacylglycerols.
Fatty acids are stored in the liver as triacylglycerols.
Where in the body are triacylglycerols primarily stored?
Where in the body are triacylglycerols primarily stored?
The interactions between polyunsaturated fatty acids are ________ than those between saturated fatty acids.
The interactions between polyunsaturated fatty acids are ________ than those between saturated fatty acids.
Which structural feature is responsible for the lower melting points of polyunsaturated fatty acids compared to saturated fatty acids?
Which structural feature is responsible for the lower melting points of polyunsaturated fatty acids compared to saturated fatty acids?
Lipids are generally soluble in polar solvents like water.
Lipids are generally soluble in polar solvents like water.
Name one factor that influences the melting point of fatty acids.
Name one factor that influences the melting point of fatty acids.
The systematic symbolic representation for a fatty acid includes the total number of carbons and the positions of ________.
The systematic symbolic representation for a fatty acid includes the total number of carbons and the positions of ________.
How does the number of double bonds in a fatty acid affect its ability to pack tightly?
How does the number of double bonds in a fatty acid affect its ability to pack tightly?
Saturated fatty acids generally have lower melting points than unsaturated fatty acids.
Saturated fatty acids generally have lower melting points than unsaturated fatty acids.
What is the role of adipose tissue in relation to lipids?
What is the role of adipose tissue in relation to lipids?
The presence of cis double bonds in fatty acids results in a(n) ________ in their structure.
The presence of cis double bonds in fatty acids results in a(n) ________ in their structure.
Flashcards
Lipids Definition
Lipids Definition
A group of naturally occurring molecules including fats, waxes, sterols, fat-soluble vitamins, monoglycerides, diglycerides, triglycerides, phospholipids, and others.
Fatty Acid (FA) Structure
Fatty Acid (FA) Structure
A fatty acid is composed of a carboxyl group at one end followed by a linear alkyl chain, which may contain one or more cis double bonds.
FA Systematic Representation
FA Systematic Representation
18:4 Δ6,9,12,15 means the FA contains 18 carbons and four double bonds between carbons 6-7, 9-10, 12-13, 15-16.
Polyunsaturated vs. Saturated FA
Polyunsaturated vs. Saturated FA
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FA Storage
FA Storage
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Study Notes
- Lipids encompass more than just fatty acids (FA).
- Fatty acids (FA) have a carboxyl group at one end and a linear alkyl chain.
- Alkyl chains in FA may have one or more cis double bonds.
- The systematic symbolic representation for FA indicates chain length and double bond positions.
- "18:4 Δ6,9,12,15" signifies an 18-carbon FA with four double bonds between carbons 6-7, 9-10, 12-13, and 15-16.
- Polyunsaturated FA pack less tightly than saturated FA.
- Weaker interactions between polyunsaturated FA result in lower melting points.
- Fatty acids are stored as triacylglycerol (TAG) in adipose tissue.
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