AQA A-Level CGP Biology Textbook 1- Topic 2B: Cell Membranes

aqa-a-level-cgp-biology-textbook-1-topic-2b-cell-membranes

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What do cell surface membrane surround?

Cells

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{"id":1590944,"question_id":"354684","created_at":"2018-01-07 15:42:15","updated_at":"2018-01-07 15:42:15","answerTitle":"Cells","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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What does partially permeable mean?

It allows some molecules through but not others

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{"id":1590945,"question_id":"354685","created_at":"2018-01-07 15:42:28","updated_at":"2018-01-07 15:42:28","answerTitle":"It allows some molecules through but not others","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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What are the 3 ways that substances can move through a cell surface membrane?

Diffusion, osmosis and active transport

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{"id":1590946,"question_id":"354686","created_at":"2018-01-07 15:42:37","updated_at":"2018-01-07 15:42:37","answerTitle":"Diffusion, osmosis and active transport","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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What is another name for the cell surface membrane?

Plasma membrane

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{"id":1590947,"question_id":"354687","created_at":"2018-01-07 15:42:46","updated_at":"2018-01-07 15:42:46","answerTitle":"Plasma membrane","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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What are cell membranes composed of?

Mainly phospholipids + some other lipids, proteins and carbohydrates (attatched to proteins/lipids)

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{"id":1590948,"question_id":"354688","created_at":"2018-01-07 15:42:54","updated_at":"2018-01-07 15:42:54","answerTitle":"Mainly phospholipids + some other lipids, proteins and carbohydrates (attatched to proteins\/lipids)","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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What is the name of the arrangement of a cell surface membrane?

Fluid mosaic model

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{"id":1590949,"question_id":"354689","created_at":"2018-01-07 15:43:06","updated_at":"2018-01-07 15:43:06","answerTitle":"Fluid mosaic model","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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Why is it a "fluid" mosaic model?

The phospholipids in the continuous double bi-layer are constantly moving

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{"id":1590950,"question_id":"354690","created_at":"2018-01-07 15:43:16","updated_at":"2018-01-07 15:43:16","answerTitle":"The phospholipids in the continuous double bi-layer are constantly moving","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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Why is it a fluid "mosaic" model?

Proteins are scattered across the bi-layer like tiles in a mosaic.

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{"id":1590951,"question_id":"354691","created_at":"2018-01-07 15:43:26","updated_at":"2018-01-07 15:43:26","answerTitle":"Proteins are scattered across the bi-layer like tiles in a mosaic.","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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Which types of protein allow substances to travel through the membrane?

Channel proteins and carrier proteins

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{"id":1590952,"question_id":"354692","created_at":"2018-01-07 15:43:42","updated_at":"2018-01-07 15:43:42","answerTitle":"Channel proteins and carrier proteins","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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What do receptor proteins do?

Allow the cell to detect chemicals released from other cells

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{"id":1590953,"question_id":"354693","created_at":"2018-01-07 15:43:51","updated_at":"2018-01-07 15:43:51","answerTitle":"Allow the cell to detect chemicals released from other cells","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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What happens when insulin hormone binds to receptor proteins in liver cells?

The cell is told to absorb glucose

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{"id":1590954,"question_id":"354694","created_at":"2018-01-07 15:44:02","updated_at":"2018-01-07 15:44:02","answerTitle":"The cell is told to absorb glucose","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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How thick is the phospholipid bilayer?

7nm

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{"id":1590955,"question_id":"354695","created_at":"2018-01-07 15:44:13","updated_at":"2018-01-07 15:44:13","answerTitle":"7nm","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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What are proteins with carbohydrates attached to them called on the cell membrane?

Glycoproteins

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{"id":1590956,"question_id":"354696","created_at":"2018-01-07 15:44:23","updated_at":"2018-01-07 15:44:23","answerTitle":"Glycoproteins","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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What are lipids with carbohydrates attached to them called on the cell membrane?

Glycolipids

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{"id":1590957,"question_id":"354697","created_at":"2018-01-07 15:44:32","updated_at":"2018-01-07 15:44:32","answerTitle":"Glycolipids","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

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Which part of the phospholipid is hydrophillic?

The head

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{"id":1590958,"question_id":"354698","created_at":"2018-01-07 15:44:55","updated_at":"2018-01-07 15:44:55","answerTitle":"The head","isAnswerCorrect":"1","isAnswerBlank":null,"isInSecondMatchingColumn":null,"sequenceOrder":null,"lang":null,"type":0}

AQA A-Level CGP Biology Textbook 1- Topic 2B: Cell Membranes

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