Flashcards
1.2 Lipids
Cards in this deck (20)
- 1How do lipids react in water and why?Insoluble in water because fatty acid tails are hydrophobic
- 2How do lipids react in organic solvents such as alcohol and acetone?Soluble in organic solvents
- 3What elements do lipids contain and how to the proportions compare to the proportions in carbohydrates?•Carbon hydrogen and oxygen
•Proportion of oxygen to carbon and hydrogen is smaller in lipids - 4Are lipids polymers?No
- 5Name the 2 types of lipids and their biological roles?•Triglycerides - store energy and provide insulation
•Phospholipids - form cell membranes - 6What is a triglyceride molecule made up of?A glycerol molecule and 3 fatty acid chains
- 7What do fatty acid molecules have?Long hydrocarbon tails
- 8How is a triglyceride formed? (Diagram)
- 92 differences between saturated fatty acids and unsaturated fatty acids?•Saturated = only single C-C bonds. Unsaturated = 1 double bond
•Saturated are solid at room temp, unsaturated are usually liquids at room temp - 104 roles of lipids?•Provide energy
•Waterproofing - insoluble in water
•Insulation - slow conductors of heat.
•Protection - fat stored around delicate organs such as kidney and heart - 11Why are triglycerides good storage molecules?Low mass to energy ratio - more energy can be stored in a small volume.
- 12What does the structure of a phospholipid look like?
- 13Phospholipids are polar molecules. What does this mean?Have 2 ends (poles) with different electrical charges which behave differently
- 14What is the head of phosphates?Hydrophilic
- 15What is the tail of phosphates?Hydrophobic
- 16What is a phospholipid bilayer?2 layers of phospholipids back to back. Arrange themselves into this when in an aqueous environment (cell membrane)
- 17What is a micelle?
- 18Why are triglycerides not polymers?Because they are not in a chain
- 19Explain the meaning of saturated?Contains only single C-C bonds
- 20Explain the meaning of unsaturated?Has one or more double C=C bonds.
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- AS level AS Biology (Unit 1 - Biological Molecules) Flashcards on 1.2 Lipids, created by Tania Parvaiz on 01/03/2017.
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- Tania Parvaiz
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