Biology AS Edexcel Snab Revision
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lifestyle-health-and-risk as19 主题
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diet-and-health interpreting-data-on-risk-factors
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diet-and-health treatment-of-cvd
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diet-and-health energy-budgets-and-diet
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diet-and-health monosaccharides
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diet-and-health the-glycosidic-bond
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diet-and-health disaccharides
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diet-and-health polysaccharides
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diet-and-health lipids-and-ester-bonds
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diet-and-health reducing-risk-factors-of-cvd
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diet-and-health practical-vitamin-c-content
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the-circulatory-system the-need-for-a-circulatory-system
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the-circulatory-system the-importance-of-water-in-transport
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the-circulatory-system mammalian-heart-structure-and-function
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the-circulatory-system blood-vessels-structure-and-function
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the-circulatory-system cardiac-cycle
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the-circulatory-system investigating-heart-rate
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the-circulatory-system atherosclerosis
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the-circulatory-system blood-clotting
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diet-and-health cardiovascular-disease
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diet-and-health interpreting-data-on-risk-factors
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genes-and-health as28 主题
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gas-exchange-cell-membranes-and-transport properties-of-gas-exchange-surfaces
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gas-exchange-cell-membranes-and-transport ficks-law-of-diffusion
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gas-exchange-cell-membranes-and-transport the-mammalian-lung
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gas-exchange-cell-membranes-and-transport cell-membranes
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gas-exchange-cell-membranes-and-transport practical-investigating-membrane-permeability
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gas-exchange-cell-membranes-and-transport diffusion-and-facilitated-diffusion
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gas-exchange-cell-membranes-and-transport active-transport
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gas-exchange-cell-membranes-and-transport osmosis
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nucleic-acids nucleotides-and-phosphodiester-bonds
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nucleic-acids dna-structure
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nucleic-acids rna-structure
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proteins transcription
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proteins translation
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proteins nature-of-the-genetic-code
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proteins amino-acids-and-peptide-bonds
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proteins levels-of-protein-structure
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proteins globular-proteins-structure-and-function
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proteins fibrous-proteins-structure-and-function
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proteins the-role-of-enzymes
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proteins mode-of-enzyme-action
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proteins enzyme-and-substrate-concentrations
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inheritance dna-replication
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inheritance mutations
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inheritance inheritance-key-terms
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inheritance pedigree-diagrams
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inheritance monohybrid-crosses
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inheritance chi-squared-test
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inheritance genetic-screening
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gas-exchange-cell-membranes-and-transport properties-of-gas-exchange-surfaces
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voice-of-the-genome as19 主题
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cell-structure-and-organisation cell-theory
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cell-structure-and-organisation eukaryotic-cells
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cell-structure-and-organisation prokaryotic-cells
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cell-structure-and-organisation organisation-of-cells
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cell-structure-and-organisation microscopy
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cell-structure-and-organisation magnification-calculations
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cell-structure-and-organisation recognising-organelles
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cell-division the-cell-cycle
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cell-division mitosis
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cell-division practical-identifying-mitosis-in-plant-cells
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reproduction-and-inheritance mammalian-gametes
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reproduction-and-inheritance fertilisation-in-mammals
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reproduction-and-inheritance genes-and-linkage
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reproduction-and-inheritance meiosis-source-of-genetic-variation
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differentiation-and-variation stem-cells
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differentiation-and-variation stem-cells-in-medicine
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differentiation-and-variation cell-differentiation
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differentiation-and-variation epigenetics
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differentiation-and-variation phenotypes-and-variation
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cell-structure-and-organisation cell-theory
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biodiversity-and-natural-resources as19 主题
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biodiversity the-variety-of-life
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biodiversity measuring-biodiversity-within-a-habitat
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biodiversity comparing-biodiversity-between-habitats
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biodiversity ecological-niches-and-adaptations
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biodiversity natural-selection
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biodiversity hardy-weinberg-equation
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biodiversity reproductive-isolation
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biodiversity classification
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biodiversity conservation-of-biodiversity
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resources-from-plants plant-cell-structure
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resources-from-plants plant-stems
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resources-from-plants importance-of-water-and-inorganic-ions-to-plants
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resources-from-plants starch-and-cellulose-structure-and-function
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resources-from-plants plant-fibres
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resources-from-plants practical-identifying-tissue-types-within-stems
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resources-from-plants tensile-strength-plant-fibres
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resources-from-plants development-of-drug-testing
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resources-from-plants antimicrobial-properties-of-plants
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resources-from-plants sustainability-and-plant-materials
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biodiversity the-variety-of-life
diet-and-health disaccharides
Exam code:8BN0
Disaccharides: Structure
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Two monosaccharides can join together via condensation reactions to form disaccharides
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A condensation reaction is one in which two molecules join together via the formation of a new chemical bond, with a molecule of water being released in the process
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The new chemical bond that forms between two monosaccharides is known as a glycosidic bond
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Common examples of disaccharides include
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Maltose
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Contains two molecules of glucose linked by a 1,4 glycosidic bond
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This means that the glycosidic bond is located between carbon 1 of one monosaccharide and carbon 4 of the other
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Sucrose
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Contains a molecule of glucose and a molecule of fructose linked by a 1,2 glycosidic bond
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This means that the glycosidic bond is located between carbon 1 of one monosaccharide and carbon 2 of the other
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Lactose
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Contains a molecule of glucose and a molecule of galactose linked by a 1,4 glycosidic bond
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Sucrose is a disaccharide formed from a molecule of glucose (left) and a molecule of fructose (right) joined together by a 1,2 glycosidic bond
Disaccharides: Function
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The function of disaccharides is to provide the body with a quick-release source of energy
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Disaccharides are made up of two sugar molecules so they’re easily broken down by enzymes in the digestive system into their respective monosaccharides and then absorbed into the bloodstream
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Due to the presence of a large number of hydroxyl groups, disaccharides are easily soluble in water
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These hydroxyl groups form hydrogen bonds with the water molecules when dissolved in aqueous solutions
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Just like monosaccharides they are sweet in taste
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Sucrose, also known as table sugar, is an example
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Responses