Molecules Lipids Molecules Lipids Objectives Warm Up List
Molecules: Lipids!
Molecules: Lipids Objectives Warm Up • List the monomers of • Describe the carbohydrates difference between • What type of reaction unsaturated and links monomers saturated fatty acids together? What are the • Distinguish between products of that cis and trans isomers reaction? • Describe the function • What are the functions of lipids of cellulose, starch, and glycogen? 2
Molecules: Lipids Objectives Warm Up • List the monomers of • Describe the carbohydrates difference between unsaturated and • Practice drawing alpha saturated fatty acids and beta glucose • Distinguish between cis and trans isomers • Describe the function of lipids 3
Understandings and applications • • Fatty acids can be saturated, monounsaturated or polyunsaturated. Unsaturated fatty acids can be cis or trans isomers. Triglycerides are formed by condensation from three fatty acids and one glycerol. Application: Scientific evidence for health risks of trans fats and saturated fatty acids. Application: Lipids are more suitable for long-term energy storage in humans than carbohydrates. Application: Evaluation of evidence and the methods used to obtain the evidence for health claims made about lipids. Skill: Determination of body mass index by calculation or use of a nomogram. 4
Lipids • Diverse group of carbon compounds • Insoluble in water • Triglycerides are one of the principal lipid groups 5
Lipids • Diverse group of carbon compounds • Insoluble in water • Triglycerides are one of the principal lipid groups 6
Triglycerides what type of • 3 fatty acids + 1 glycerol reaction? ? 7
Fatty Acids Saturated Monounsaturated Polyunsaturated 8
Unsaturated Fatty Acids: Cis or Trans ISOMERS SAME chemical formula DIFFERENT arrangements! 9
Unsaturated Fatty Acids: Cis or Trans The kink in cis-fatty acids makes them Liquid at room less able to pack temp. close together. Which type of fatty Solid cis at room temp. acid, or trans, has a lower melting temperature? 10
Saturated, monounsaturated, or polyunsaturated? 11
Saturated, monounsaturated, or polyunsaturated? 12
Unsaturated Fatty Acids: Cis or Trans 13
Cis or trans isomers? 14
Cis or trans isomers? 15
Polymers: Long term storage! • Long term energy storage (fatty acids can be released when needed) • Calorically dense- 9 Cal/g vs. 4 Cal/gram (carbohydrates) • Triglycerides used for energy storage and can be used as insulators 16
Lipid Function: Insulation (electrical) 17
Body Mass Index Nomogram 18
Practice! C 3 H 8 O 3 19
Practice! 20
- Slides: 20