Domanda del libro di testo
Which of these fatty acids has the lower melting point? Explain why.
a. Linoleic acid
b. Stearic acid
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Ch.23 Lipids
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 23, Problema 28
Draw an 18-carbon saturated fatty acid. Is this a “straight-chain” molecule or a “bent” molecule?
Guida verificata passo dopo passo1
Step 1: Understand the structure of a saturated fatty acid. A saturated fatty acid contains only single bonds between carbon atoms, meaning there are no double or triple bonds in the hydrocarbon chain.
Step 2: Recognize that the molecule has 18 carbon atoms. The structure will consist of a carboxylic acid group (COOH) at one end and a long hydrocarbon chain of 17 carbon atoms attached to it.
Step 3: Draw the carboxylic acid group (COOH) at one end of the molecule. This is the functional group that defines the molecule as a fatty acid.
Step 4: Add 17 carbon atoms in a straight chain, each bonded to two hydrogen atoms (except for the terminal carbon, which will have three hydrogens). Use the general formula for a saturated fatty acid: \( C_nH_{2n+1}COOH \), where \( n \) is the number of carbons in the chain.
Step 5: Determine the shape of the molecule. Since there are no double bonds, the molecule will be a 'straight-chain' structure, as the single bonds allow the carbon atoms to align in a linear fashion without kinks or bends.
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Saturated Fatty Acids
Saturated fatty acids are types of fats that have no double bonds between the carbon atoms in their hydrocarbon chain. This means that each carbon atom is fully 'saturated' with hydrogen atoms. The absence of double bonds allows these fatty acids to pack closely together, resulting in a solid state at room temperature, which is characteristic of saturated fats.
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Percorso guidato
2:26
Fatty Acids Concept 2
Molecular Structure
The molecular structure of a fatty acid includes a long hydrocarbon chain with a carboxylic acid group at one end. In the case of an 18-carbon saturated fatty acid, the chain consists of 18 carbon atoms linked by single bonds. This structure is typically linear or 'straight-chain' due to the lack of double bonds, which would otherwise introduce bends or kinks in the chain.
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Percorso guidato
00:34Molecular Models Example 1
Straight-Chain vs. Bent Molecules
Straight-chain molecules have a linear arrangement of atoms, allowing them to pack tightly together, while bent molecules have one or more double bonds that create angles in the chain. In the case of an 18-carbon saturated fatty acid, the absence of double bonds means it is a straight-chain molecule, which influences its physical properties and behavior in biological systems.
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Percorso guidato
1:43Intro to Electron Transport Chain Example 1
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Domanda del libro di testo
Complete hydrogenation of triacylglycerol C in Problem 23.20 yields a triacylglycerol of what fatty acid composition? Would the hydrogenation product of triacylglycerol C be more like the hydrogenation product of triacylglycerol A or B? Explain.
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Domanda del libro di testo
Draw an 18-carbon unsaturated fatty acid that contains two carbon–carbon double bonds, one on carbon 6 and one on carbon 9 (count starting with the carboxyl carbon). Is this a “straight-chain” molecule or a “bent” molecule?
1120
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Domanda del libro di testo
As noted earlier (Section 22.3), he first step in glycolysis, which occurs within cells, is phosphorylation of glucose to glucose 6-phosphate. Why does this step prevent passive diffusion of glucose back out of the cell?
1103
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Domanda del libro di testo
A membrane lipid was isolated and completely hydrolyzed. The following products were detected: ethanolamine, phosphate, glycerol, palmitic acid, and oleic acid. Propose a structure for this membrane lipid, and name the family to which it belongs.
768
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Domanda del libro di testo
Are the carbon–carbon double bonds in naturally occurring fatty acids primarily cis or trans?
1491
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