4.1: Structure of the cell membrane Flashcards

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1
Q

All cells are surrounded by a

A

membrane

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2
Q

In eukaryotic cells, many of the organelles are surrounded by a

A

membrane

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3
Q

Partially permeable

A

Allow some molecules through but not others

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4
Q

Membranes around organelle act as a …

dividing the cell into different …

A

barrier between organelles and the cytoplasm

compartments

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5
Q

Cell membranes structure

A

fluid mosaic structure

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6
Q

Cell membranes mainly composed of

A

lipids, proteins and carbohydrates

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7
Q

Fluid mosaic model

describes

A

arrangement of molecules in the membrane

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8
Q

Fluid mosaic model

in the model

A

Phospholipid molecules form a continuous double layer (bilayer) which is fluid

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9
Q

Proteins on/in the bilayer

A

receptor proteins, channel proteins and carrier proteins

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10
Q

Glycoproteins

A

proteins have a polysaccharide chain attached to them

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11
Q

Glycolipids

A

lipids have a polysaccharide chain attached to them

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12
Q

Centre of the phospholipid bilayer is

A

hydrophobic

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13
Q

Cholesterol is a type of

A

lipid

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14
Q

Where is cholesterol present in cells

A

all cell membrane except bacteria cell membranes

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15
Q

Where is cholesterol present in cell membranes

A

between phospholipids

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16
Q

Cholesterol function

A

makes the membrane more rigid and less fluid

17
Q

Cholesterol

how does it carry out its function

A

by fitting between phospholipids and binding to their hydrophobic tails which causes them to pack together more closely which restricts the movement of the phospholipids