session no. 2.1. biological molecules carbohydrates and lipids
TRANSCRIPT
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Learning Objectives
At the end of this session, 1.I can categorize the biological molecule as a carbohydrate or lipid according to their structure and function (STEM_BIO11/12-Ii-j-15).2.I can explain the role of each biological molecule in specific metabolic processes(STEM_BIO11/12-Ii-j-16).
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Words to rememberMacromolecules Polysaccharides Saturated fatty acids
Polymer Starch Unsaturated fatty acids
Monomer Glycogen Trans fat
dehydration Cellulose Phospholipids
Hydrolysis Chitin Steroids
Carbohydrates Lipids cholesterol
Monosaccharides fats
disaccharides Fatty acids
Glycosidic bond Triacylglycerol
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Activity: Food Nutrition Labels 1. How many servings are in this container?2. Would you agree that this is the reasonable amount of
food you would consume per serving? How many total food calories (C) are in this container?
3. How much fat is present in one serving? What kind of fat?4. What is the importance of consuming fats in our diet?5. How much carbohydrates are present in one serving?6. What kind of carbohydrates? What is the importance of
consuming carbohydrates in our diet?7. Decide on whether this food sample can be eaten often or
sparingly and justify.
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What is calorie?• A measure of energy in food
• An average man needs about 2500 kCal/day (10.500KJ)
• Estimated calorie needs per day by age, gender & physical activities
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Rice Nutritional
Facts
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Elements found in human being.
96%
99%
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What are Carbohydrates?• Macromolecules or biomolecules• general formula of CnH2mOm• 2:1 ration of H and O• Example
glucose - C6H12O6
sucrose - C12H22O11.• Raw materials for other molecules and source
of energy• 1 gm of Carb = 16 KJ or 3.24 Kcal of energy
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How carbohydrates are formed?• Made from repeating units, the
monomer that are covalently bonded (glycosidic bond) to form polymer through the process of dehydration (one molecule losses hydrogen atom and the other losses hydroxyl group to form water) or condensation.
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Dehydration Synthesis of Sugars
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• Polysaccharides are formed by monosaccharide addition through succeeding dehydration
• Example: formation of glycogen in the
liver and starch in plant ground tissues
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How polysaccharides are broken down?
• By breaking the glycocidic bonds through hydrolysis (water mediated) and release of energy.
• The opposite process of dehydration
• Occurs in digestive tract through mechanical and chemical digestions (enzyme mediated)
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Three main categories of carbohydrates
•Monosaccharides•Disaccharides•Polysaccharides
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Monosaccharides
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Disaccharides
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What is Lipids?• Large biomolecules but not a polymer• All non-polar• Composed of O but abundance in C-
H bonds• Provide 37KJ/ 8.86 Kcal energy/gm• Cushion vital organs, insulation,
precursor for testosterone, important in plasma membrane structure
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Three Types of Lipids• Fats (triacylglycerols or
triglycerides)
• Phospholipids
• Sterols/Steroids
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Types of Phosphatidyl
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Where fats are stored in the body?
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Identify the food items whether it is carbohydrate or fats.
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Group Assignment
• Bring the following:Group 1 - Potato Group 2 – White Peanut Group 3 - Ripe banana Group 4 – Hardboiled Egg
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• Image of cell membrane showing the position of cholesterol. http://study.com/cimages/multimages/16/fluidmosaic.png
• Structure of different types of phosphatidyl. http://oregonstate.edu/instruct/bb451/451material/stryer7/CH12/figure_12_05.jpg
• Image of phospholipid bilayers. http://academic.brooklyn.cuny.edu/biology/bio4fv/page/phosphb.htm
• Saturated and unsaturated fatty acid structures. http://www.scienceprofonline.com/images/fat-saturated_unsaturated.jpg
• Fat cells. http://www.weightlossforall.com/fat-storage-body.htm