Domanda del libro di testo
Identify each lipoprotein described here as either chylomicron, HDL, LDL, or VLDL.
d. Which lipoprotein contains “bad cholesterol” from a vascular disease risk standpoint?
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Ch.24 Lipid Metabolism
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 24, Problema 14
One strategy used in many different biochemical pathways is an initial investment of energy early on and a large payoff in energy at the end of the pathway. How is this strategy utilized in the catabolism of fats?
Guida verificata passo dopo passo1
Understand the concept of catabolism: Catabolism is the breakdown of larger molecules into smaller ones, releasing energy in the process. In the case of fats, this involves breaking down triglycerides into glycerol and fatty acids, which are further processed to release energy.
Step 1: Initial energy investment: During fat catabolism, fatty acids undergo a process called beta-oxidation. Before beta-oxidation can occur, fatty acids must be activated. This activation requires an initial investment of energy in the form of ATP, which is used to convert the fatty acid into acyl-CoA.
Step 2: Beta-oxidation process: Once activated, the fatty acyl-CoA enters the beta-oxidation cycle. In this cycle, the fatty acid is broken down into two-carbon units in the form of acetyl-CoA. Each cycle of beta-oxidation generates reduced coenzymes (NADH and FADH2), which store energy.
Step 3: Large energy payoff: The acetyl-CoA produced during beta-oxidation enters the citric acid cycle (Krebs cycle), where it is further oxidized to produce more NADH and FADH2. These reduced coenzymes then donate electrons to the electron transport chain, leading to the production of a large amount of ATP through oxidative phosphorylation.
Step 4: Summary of the strategy: The initial investment of ATP to activate fatty acids is relatively small compared to the large energy payoff obtained from the complete oxidation of fatty acids. This strategy ensures that the energy yield from fat catabolism is highly efficient and maximized.
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Catabolism
Catabolism refers to the metabolic process where complex molecules are broken down into simpler ones, releasing energy in the process. In the context of fats, catabolism involves the breakdown of triglycerides into glycerol and fatty acids, which can then be further oxidized to produce ATP, the energy currency of the cell.
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2:06
Intro to Amino Acid Catabolism Concept 1
Energy Investment Phase
The energy investment phase is the initial stage of a metabolic pathway where energy is consumed to activate the substrate for subsequent reactions. In fat catabolism, this phase includes the activation of fatty acids, which requires ATP to form acyl-CoA, setting the stage for their breakdown and energy release in later steps.
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01:26Nature of Energy
Beta-Oxidation
Beta-oxidation is the metabolic process by which fatty acids are broken down in the mitochondria to generate acetyl-CoA, NADH, and FADH2. This process involves multiple cycles of oxidation and cleavage, ultimately leading to a significant release of energy, illustrating the strategy of an initial energy investment followed by a large energy payoff.
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02:32Characteristics of Beta Particles
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Compare the differences between β oxidation and fatty acid synthesis (lipogenesis). Are these pathways the reverse of each other?
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Identify each lipoprotein described here as either chylomicron, HDL, LDL, or VLDL.
a. Which lipoprotein has the lowest density? Why?
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Oxygen is not a reactant in the β oxidation of fatty acids. Can β oxidation occur under anaerobic conditions? Explain.
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What is the purpose of bile acids in lipid digestion?
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Why do lipids make you feel full for a long time after a meal?
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