2.3: Carbohydrates & Lipids. Carbohydrates You have 30 seconds to write down EVERYTHING you know…

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Presentation transcript:

2.3: Carbohydrates & Lipids

Carbohydrates You have 30 seconds to write down EVERYTHING you know…

Investigating starch Download the method from moodle. Complete experiment HWK Evaluate the method using the IB marking criteria.

Comparing the energy storage of carbohydrates & lipids

Polysaccharides Three examples, all formed from glucose. StarchGlycogenCellulose Formed from alpha- glucose. Condensation between C-1 and C-4. Each alpha glucose is in the same position. Results in a curved structure Forms a helix, using hydrogen bonds. Formed from alpha- glucose. Condensation between C-1 and C-4. Very similar to starch, but the chains form branches, resulting in a globules. Formed from beta- glucose. Condensation between carbon-1 and carbon-4. Each beta glucose added to the chain is to the previous one. Results in a straight chain. Form bundles, using hydrogen bonds. Storage in plantsAnimals & some fungi, stored in the liver & muscles. Very strong, plant cell walls

Lipids Triglycerides are formed from the condensation between three fatty acids and one glycerol. Triglycerides are present in adipose tissue (fat in humans) and oils in sunflower seeds. Fats are liquid at body temperature, solid at room temperature. Oils are liquid at both temperatures. See fig. 7, pg. 78 for diagram of condensation reaction. The bond between an acid (fatty acid) and the OH- (glycerol) is an ester. Useful for energy storage. Energy can be released by aerobic respiration. Also good insulators.

Energy storage Lipids = long term storage Carbohydrates = short term storage Why? 1.Lipids release twice as much energy per gram 2.Lipids have secondary roles e.g. insulation, shock absorber Glycogen is the short term energy store of carbohydrate. Glycogen can be rapidly broken down into glucose and transported in the blood. Glucose can then be used for aerobic or anaerobic respiration.

Fatty acids Can be saturated, monounsaturated or even polyunsaturated Most fatty acids have between 14 – 20 carbon atoms. See fig. 12, pg. 82 for a diagram showing the three forms of fatty acids.

The two forms of unsaturated fatty acids Cis-fatty acids, hydrogen atoms on the same side of the carbon atoms either side of the double bond. Trans-fatty acids, hydrogen atoms on opposite sides of the carbon atoms either side of the double bond. CisTrans Bend in the hydrocarbon means cis-fatty acids cannot be ‘packed’ so easily  lower melting point. Liquid at room temp. = oils No bend, so can be tightly packed together  high melting point. Solid at room temperature = fats.

Read Health risks of fats, pg Evaluate the evidence and the methods used to obtain evidence for health-claims made about lipids. Complete data-based questions.