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14 Cards in this Set
- Front
- Back
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If the molecular formula of glucose is C6H1206, what is the molecular formula of maltose? |
C12H22O11 |
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Why is it important that starch does not affect the water potential of a storage cell's cytoplasm? |
It would create a water potential gradient into the plant cells |
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Why does being highly branched enable glycogen to be hydrolysed faster than starch? |
Te polysaccharides are hydrolysised at their ends. The more ends, the more enzymes can attach and hydrolysise the polysaccharides |
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Explain why a triglyceride is not classified as a polymer |
A polymer is a chain of repeated molecules of the same type (monomers). The components of a triglyceride are not the same type of molecule |
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How many levels of protein organisation can you see in the haemoglobin molecule? (ADD FIGURE 1.8) |
3 primary (order of amino acids) secondary (each polypeptide is a helix) quaternary (four polypeptides in a molecule) |
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What is the difference between ribose and deoxyribose? |
Deoxyribose has a hydrogen atom in place of a hydroxyl group on carbon-2 |
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Define the term phosphodiester bond |
It is a covalent bond between a phosphate group and the carbon-3 of one nucleotide and the carbon-5 of the next nucleotide in the chain |
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What is the difference between an exon and an intron? |
An exon is coding whereas an intron is not |
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Suggest why mRNA in prokaryotic cells is not edited before it is used by ribosomes |
Prokaryotic DNA lacks introns/is all coding |
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The sense strand of a DNA molecule has the base sequence CTAGCC. Give the anticodons of the tRNA molecules that will carry amino acids to the mRNA produced from this DNA |
GAUCGG |
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In which DNA base triplet would a point mutation always result in a change in the encoded amino acid? Explain your answer |
ATG It is the only base triplet that codes for methionine |
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Maltase is an enzyme that hydrolyses the disaccharide maltose into glucose. It will not hydrolyse other disaccharides, such as sucrose or lactose. Explain why |
Sucrose and lactose molecules are not complementary to the tertiary structure of the active site of maltase |
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The curve in the diagram levels off after 7 mins. Explain why (FIGURE 1.19) |
All substrate has been converted to product |
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Is a phosphate ion an anion or a cation? |
an anion |
