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11 Cards in this Set
- Front
- Back
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A starch molecule has a spiral shape. Explain why this shape is important to its function in cells |
Compact/ occupy small space /tightly packed |
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Explain one way in which starch molecules are adapted for their function in plant cells |
Insoluble - don't affect water potential / helical - compact / large molecule - cannot leave cell |
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The structure of cellulose is related to its role in plant cell walls |
Long straight unbranched-chains of glucose joined by hydrogen bonds form microfibrils and provide rigidity strength and support |
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Give one feature of starch and explain how this feature enables it to act as a storage substance |
Cold so compact insoluble so no osmotic effect large molecules so does not leave cell Branched chains so easy to remove glucose |
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Explain why hydrogen bonds are important in cellulose molecules |
Hold cellulose molecules together Providing strength and rigidity Hydrogen bonds strong in large numbers |
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Describe test for reducing sugars |
Add Benedict's solution heat red precipitate present |
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Describe the test for starch |
Add iodine to food sample Blue black indicates starch |
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What is an unsaturated fatty acid |
Double bonds between carbons |
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Describe emulsion test for lipids |
Crush with ethanol then add water and a cloudy white emulsion layer forms |
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What is the difference between a triglyceride and a phospholipid |
Fatty acid removed and replaced with a phosphate group |
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Describe the structure of proteins |
Polymer of amino acids joined by peptide bonds formed by condensation. Primary structure is order of amino acids; secondary structure is folding of polypeptide chain due to hydrogen bonding; tertiary structure is three dimensional folding due to hydrogen bonding and ionic and disulfide bonds; quaternary structure is two or more polypeptide chains. |
