Concept explainers
(a)
Interpretation:
The following intermediate compound generated in the first or second cycle of the lipogenesis pathway is produced by (1) a dehydration reaction, (2) a hydrogenation reaction, or (3) a condensation reaction has to be identified.
Concept introduction:
Lipogenesis is the process employed for the synthesis of fatty acid. The starting precursor for the synthesis is acetyl CoA. The enzyme employed for the process is fatty acid synthase. It is a multienzyme complex that ties the reaction responsible for the synthesis of fatty acid. The fatty acid is synthesized in two parts. In the first part, there is citrate-malate shuttle system and in the second part, there is a cyclic process to synthesize saturated fatty acid.
The different reactions that are involved in the cyclic process are:
In hydrogenation reaction, a hydrogen molecule (H2) is added to an organic substance; in hydration reaction, a water molecule (H2O) is added to an unsaturated substrate; in the condensation reaction, two molecules combine to form a single product.
The first turn of the cyclic process produces four-carbon acyl group and the further turns add two carbon unit to the four-carbon acyl group. Therefore, the first turn has four carbon units and the second turn has six carbon unit in their intermediate compound.
(b)
Interpretation:
The following intermediate compound generated in the first or second cycle of the lipogenesis pathway is produced by (1) a dehydration reaction, (2) a hydrogenation reaction, or (3) a condensation reaction has to be identified.
Concept introduction:
Lipogenesis is the process employed for the synthesis of fatty acid. The starting precursor for the synthesis is acetyl CoA. The enzyme employed for the process is fatty acid synthase. It is a multienzyme complex that ties the reaction responsible for the synthesis of fatty acid. The fatty acid is synthesized in two parts. In the first part, there is citrate-malate shuttle system and in the second part, there is a cyclic process to synthesize saturated fatty acid.
The different reactions that are involved in the cyclic process are:
In hydrogenation reaction, a hydrogen molecule (H2) is added to an organic substance; in hydration reaction, a water molecule (H2O) is added to an unsaturated substrate; in the condensation reaction, two molecules combine to form a single product.
The first turn of the cyclic process produces four-carbon acyl group and the further turns add two carbon unit to the four-carbon acyl group. Therefore, the first turn has four carbon units and the second turn has six carbon unit in their intermediate compound.
(c)
Interpretation:
The following intermediate compound generated in the first or second cycle of the lipogenesis pathway is produced by (1) a dehydration reaction, (2) a hydrogenation reaction, or (3) a condensation reaction has to be identified.
Concept introduction:
Lipogenesis is the process employed for the synthesis of fatty acid. The starting precursor for the synthesis is acetyl CoA. The enzyme employed for the process is fatty acid synthase. It is a multienzyme complex that ties the reaction responsible for the synthesis of fatty acid. The fatty acid is synthesized in two parts. In the first part, there is citrate-malate shuttle system and in the second part, there is a cyclic process to synthesize saturated fatty acid.
The different reactions that are involved in the cyclic process are:
In hydrogenation reaction, a hydrogen molecule (H2) is added to an organic substance; in hydration reaction, a water molecule (H2O) is added to an unsaturated substrate; in the condensation reaction, two molecules combine to form a single product.
The first turn of the cyclic process produces four-carbon acyl group and the further turns add two carbon unit to the four-carbon acyl group. Therefore, the first turn has four carbon units and the second turn has six carbon unit in their intermediate compound.
(d)
Interpretation:
The following intermediate compound generated in the first or second cycle of the lipogenesis pathway is produced by (1) a dehydration reaction, (2) a hydrogenation reaction, or (3) a condensation reaction has to be identified.
Concept introduction:
Lipogenesis is the process employed for the synthesis of fatty acid. The starting precursor for the synthesis is acetyl CoA. The enzyme employed for the process is fatty acid synthase. It is a multienzyme complex that ties the reaction responsible for the synthesis of fatty acid. The fatty acid is synthesized in two parts. In the first part, there is citrate-malate shuttle system and in the second part, there is a cyclic process to synthesize saturated fatty acid.
The different reactions that are involved in the cyclic process are:
In hydrogenation reaction, a hydrogen molecule (H2) is added to an organic substance; in hydration reaction, a water molecule (H2O) is added to an unsaturated substrate; in the condensation reaction, two molecules combine to form a single product.
The first turn of the cyclic process produces four-carbon acyl group and the further turns add two carbon unit to the four-carbon acyl group. Therefore, the first turn has four carbon units and the second turn has six carbon unit in their intermediate compound.
Want to see the full answer?
Check out a sample textbook solutionChapter 25 Solutions
Study Guide with Selected Solutions for Stoker's General, Organic, and Biological Chemistry, 7th
- What is the chemical composition of bile?arrow_forwardCompare the biological functions of glucagon and epinephrine.arrow_forwardClassify each of the fatty acids in Problem 19-14 using the omega classification system or indicate that the omega classification system does not apply to the fatty acid.arrow_forward
- What are the products of the complete hydrolysis of a triacylglycerol?arrow_forwardWhat role does molecular oxygen, O2, play in fatty acid biosynthesis?arrow_forwardWhat is the biochemical function category for each of the following types of lipids? a. triacylglycerols b. bile acids c. cholesterol d. steroid hormonesarrow_forward
- What are endorphins?arrow_forwardWhich of the following hormones inhibits the breakdown of lipids? cholesterol progesterone Oprostaglandins glucagon insulinarrow_forward19-46 In a dietary context, classify each of the following fatty acids as an essential fatty acid or as a nonessential fatty acid. a. Stearic acid (18:0) b. Linolenic acid (18:3) c. Oleic acid (18:1) d. Arachidic acid (20:0) 10 /7 Earrow_forward
- Match the lipid pathway with its description Question 27 options: dietary lipids absorbed and packaged into chylomicrons fate of VLDL produced in the liver pathway of HDL to return cholesterol to the liver fate of chylomicrons before they reach the liver 1. lipid absorption 2. exogenous 3. endogenous 4. reverse cholesterol transportarrow_forwardWhat are the enzymes and co-enzymes in each step needed in beta oxidation of fatty acids.arrow_forward
- General, Organic, and Biological ChemistryChemistryISBN:9781285853918Author:H. Stephen StokerPublisher:Cengage LearningOrganic And Biological ChemistryChemistryISBN:9781305081079Author:STOKER, H. Stephen (howard Stephen)Publisher:Cengage Learning,Chemistry for Today: General, Organic, and Bioche...ChemistryISBN:9781305960060Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. HansenPublisher:Cengage Learning