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Ch.23 Lipids
McMurry - Fundamentals of General, Organic, and Biological Chemistry 8th Edition
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMcMurry 8th EditionCh.23 LipidsProblema 16a
Capitolo 23, Problema 16a

Which of the following terms apply to the compound shown below? (Hint: Look at the functional groups and the bonds involved to begin analyzing the compound part by part in comparison to the lipids discussed in this chapter.)
Chemical structure of a glycerophospholipid, showing functional groups and bonds for analysis.
a. A phospholipid

Guida verificata passo dopo passo
1
Examine the structure of the compound in the image provided. Identify the key functional groups present, such as phosphate groups, fatty acid chains, or glycerol backbones, which are characteristic of lipids.
Recall the definition of a phospholipid: a molecule that typically consists of a glycerol backbone, two fatty acid chains (hydrophobic tails), and a phosphate group attached to a polar head group (hydrophilic head).
Compare the functional groups and structural components of the compound in the image to the characteristics of a phospholipid. Look for the presence of a phosphate group and the arrangement of hydrophobic and hydrophilic regions.
Analyze the bonds involved in the compound. Phospholipids often have ester bonds linking the fatty acid chains to the glycerol backbone and a phosphoester bond connecting the phosphate group to the glycerol.
Determine if the compound matches the structural and functional criteria of a phospholipid based on your analysis. If it does, the term 'phospholipid' applies to the compound.

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Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In the context of lipids, common functional groups include hydroxyl (-OH), carboxyl (-COOH), and phosphate (-PO4). Identifying these groups in a compound helps determine its chemical behavior and classification.
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Functional Group Priorities Concept 1

Phospholipids

Phospholipids are a class of lipids that are a major component of all cell membranes. They consist of two fatty acid tails and a phosphate group attached to a glycerol backbone. The amphipathic nature of phospholipids, with hydrophilic heads and hydrophobic tails, allows them to form bilayers that are essential for membrane structure and function.
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Glycerophospholipids Example 1

Comparative Analysis

Comparative analysis involves examining the similarities and differences between compounds to classify them accurately. In this case, comparing the compound in question to known lipids, particularly phospholipids, helps in identifying its functional groups and structural characteristics, leading to a better understanding of its classification.
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Dimensional Analysis
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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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Draw the structure of the glycerophospholipid that contains a stearic acid acyl group, an oleic acid acyl group, and a phosphate bonded to ethanolamine.

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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?

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Draw the structure of the sphingomyelin that contains a myristic acid acyl group. Identify the hydrophilic head group and the hydrophobic tails in this molecule.

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Identify the products formed by complete hydrolysis of all ester bonds in (b) the sphingomyelin in Figure 23.5.

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Which of the following terms apply to the compound shown below? (Hint: Look at the functional groups and the bonds involved to begin analyzing the compound part by part in comparison to the lipids discussed in this chapter.)

e. A lipid

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