Biol111

biol100-series-1

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212867

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Give two issues with Davson and Danielli's sandwich model

1) Membranes differ in composition and structure 2) Membrane proteins aren't very water soluble

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212869

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Which membrane structure model is now widely accepted?

Fluid Mosaic model

Explanation

Proof using freeze fracture

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212871

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Is lateral movement or flip-flopping of phospholipids more rare?

Flip-flopping

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{"id":993301,"question_id":"212871","created_at":"2017-05-30 13:39:58","updated_at":"2017-05-30 13:39:58","answerTitle":"Flip-flopping","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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212875

180

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How does cholesterol affect membrane fluidity?

Helps stabalise the membrane by acting as a temperature buffer

Explanation

eg. hinders packing at lower temeratures, maintains fluidity

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{"id":993310,"question_id":"212875","created_at":"2017-05-30 13:41:26","updated_at":"2017-05-30 13:41:26","answerTitle":"Helps stabalise the membrane by acting as a temperature buffer","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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212877

120

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True or False: Unsaturated hydrocarbon tails increase fluidity

True

Explanation

Kinks prevent packing

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212879

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How do membrane proteins move in the membrane?

Hop diffusion

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{"id":993315,"question_id":"212879","created_at":"2017-05-30 13:43:20","updated_at":"2017-05-30 13:43:20","answerTitle":"Hop diffusion","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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212889

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Give the 3 main groups of membrane proteins?

Integral(transmembrane), Peripheral (Loosely bound via other proteins), Lipid-anchored (covalently attached to lipids)

Explanation

Hydrophobic and hydrophilic domains determine how proteins associate with a membrane

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{"id":993350,"question_id":"212889","created_at":"2017-05-30 13:48:39","updated_at":"2017-05-30 13:48:39","answerTitle":"Integral(transmembrane), Peripheral (Loosely bound via other proteins), Lipid-anchored (covalently attached to lipids)","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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212890

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Give a function of membrane carbohydrates

Identity tags

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{"id":993351,"question_id":"212890","created_at":"2017-05-30 13:49:29","updated_at":"2017-05-30 13:49:29","answerTitle":"Identity tags","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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212893

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The rate a molecule diffuses across a lipid bilayer depends on what?

Size, solubility in oil

Explanation

Small hydrophobic molecules diffuse easily across the membrane

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{"id":993354,"question_id":"212893","created_at":"2017-05-30 13:52:26","updated_at":"2017-05-30 13:52:26","answerTitle":"Size, solubility in oil","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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212895

180

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Give 2 types of membrane transport protein

Proteins with hydrophilic channels, proteins that bind and transport molecules using energy

Explanation

Usually quite specific to the substance being transported

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{"id":993356,"question_id":"212895","created_at":"2017-05-30 13:54:11","updated_at":"2017-05-30 13:54:11","answerTitle":"Proteins with hydrophilic channels, proteins that bind and transport molecules using energy","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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212896

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Give 2 importances of cell-cell recognition

Sort cells during embryogenesis, recognise and reject foreign cells

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{"id":993357,"question_id":"212896","created_at":"2017-05-30 13:55:18","updated_at":"2017-05-30 13:55:18","answerTitle":"Sort cells during embryogenesis, recognise and reject foreign cells","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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212666

180

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What is the electron configuration in water?

sp3 hybridised

Explanation

Gives a tetrahedral shape. Bond angle would be 109.5 but lone pair repulsion reduce this to 104.5

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{"id":992811,"question_id":"212666","created_at":"2017-05-30 09:22:36","updated_at":"2017-05-30 09:22:36","answerTitle":"sp3 hybridised","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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212667

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What type of bonding is found between O and H in a water molecule?

Polar covalent

Explanation

Higher electronegativity of oxygen creates a partial negative oxygen and partial positive hydrogens

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212669

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Give the 8 effects of hydrogen bonding in water

1) Higher BP 2) Higher cohesion 3) Higher heat of vaporisation 4) Ice is less dense than water (4 h-bonds compared to 3.7 in water) 5) Higher surface tension 6) Higher specific heat 7) Good solvent for polar molecules and ionic compounds 8) Oil-drop effect

Explanation

Heat of vaporisation is energy to convert 1g of water to steam. Specific heat is amount of heat lost or gained to alter the temp of 1g of water by 1oC- Hbonds allow water to resist the change. Oil drop effect: Water molecules are less stable near hydropho

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212670

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What is molecular mass?

The sum of masses of all atoms in a molecule

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