transport across cell membrane Flashcards

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1
Q

what is the function of a cell membrane

A

controls the entry and exit of materials

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2
Q

what is the cell membrane made up of

A

proteins
phospholipids

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3
Q

what is the cell membrane described as

A

selectively permeable

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4
Q

what is diffusion

A

the movement of molecules from an area of high concentration to an area of low concentration, down a concentration

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5
Q

does diffusion require energy

A

no, diffusion is a passive process

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6
Q

what is osmosis

A

movement of water molecules from an area of high water concentration to an area of low water concentration, through a selectively permeable membrane

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7
Q

does osmosis require energy

A

no, osmosis is a passive process

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8
Q

what piece of equipment is used to show osmosis is occuring

A

an osmometer

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9
Q

what would happen if an animal cell was left in pure wter

A

an animal cell would burst

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10
Q

why would an animal cell burst in pure water

A

because it doesnt have a cell wall

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11
Q

what would happen if an animal cell was left in a strong salt/sugar solution

A

an animal cell would shrink

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12
Q

what would happen if the water concentration is the same inside and outside of the cell?

A

there would be no net movement

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13
Q

what would happen if a plant cell was left in pure water

A

a plant cell would become turgid

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14
Q

why would a plant cell not burst if it was left in pure water

A

because it has a cell wall

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15
Q

what would happen if a plant cell was left in a strong salt/sugar solution

A

a plant cell would become plasmolysed

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16
Q

what is active transport

A

movement of molecules from an area of low concentration to an area of high concentration, against the concentration gradient