The major functions of the following lipid classes: 1) Phospholipids 2) Sphingolipids 3) Oils 4) Waxes 5) Steroids 6) Carotenoids Introduction: Lipids are one of the water-insoluble substances that occur in nature. They perform various functions in the cell, also beingan important source of energy for the cell. Many biomolecules such as hormones, antioxidants, pigments, and vitamins are composed of lipid molecules. Lipids are classified into six major classes, namely, fatty acids, triacylglycerol, wax esters, phospholipids, sphingolipids, and isoprenoids.

Question

Given the values for the changes in enthalpy (AH) and entropy (AS), which processes can take place at 298 K without violating the Second Law of Thermodynamics? (a) AH = (b) AH = -84 kJ mol¹ (−20 kcal mol¹), AS = -125 J mol-¹ K-¹ (-30 cal mol-¹ K-¹) (c) AH = +84 kJ mol¹ (+20 kcal mol¯¹), AS = +125 J mol¯¹ K−¹ (+30 cal mol-¹ K-¹) (d) AH = +84 kJ mol-1 (+20 kcal mol-¹), AS = -125 J mol¯¹ K-¹ (-30 cal mol-¹ K-¹) -84 kJ mol¹ (-20 kcal mol¹), AS = +125 J mol¯¹ K-¹ (+30 cal mol-¹ K-¹)

Answer 1

Question

Chapter 11, Problem 16RQ

Summary Introduction

To review:

The major functions of the following lipid classes:

1) Phospholipids

2) Sphingolipids

3) Oils

4) Waxes

5) Steroids

6) Carotenoids

Introduction:

Lipids are one of the water-insoluble substances that occur in nature. They perform various functions in the cell, also beingan important source of energy for the cell. Many biomolecules such as hormones, antioxidants, pigments, and vitamins are composed of lipid molecules. Lipids are classified into six major classes, namely, fatty acids, triacylglycerol, wax esters, phospholipids, sphingolipids, and isoprenoids.

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