Transport Across Cell Membranes Flashcards

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1
Q

Describe the structure of the Cell Membrane

A

The Cell Membrane is made up from proteins and phospholipids

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2
Q

What is the membrane of a proteins with a channel running through it describes as?

A

Selectively permeable

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3
Q

What does selectively permeable mean?

A

It controls what enters and exits a cell by size, smaller molecules will be able to get in however larger ones won’t

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4
Q

What are some substances that can pass through the membrane?

A

Oxygen, glucose and amino acids

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5
Q

What are some substances that can’t pass through the membrane?

A

Starch, proteins and cells

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6
Q

What does ‘Concentration Gradient’ mean

A

The term concentration gradient means that the concentration of a particular substance os greater on one side than the other

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7
Q

What is Diffusion?

A

The movement of molecules of a substance moving down a concentration gradient. The concentration always moves from a higher region of concentration to a lower region

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8
Q

What type of transport is diffusion?

A

Passive (doesn’t require energy to be carried out)

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9
Q

What substances can diffuse into a cell?

A

Oxygen and glucose

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10
Q

What substances can diffuse out of a cell?

A

CO2 and waste

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11
Q

What is Osmosis?

A

Osmosis is the movement of water molecules from a higher water concentration to a lower water concentration across a selectively permeable membrane

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12
Q

Is the salt concentration of a potato was 2% and the salt concentration of the water was 4% would the potato gain or loose mass?

A

It would loose mass

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13
Q

What type of transport is Osmosis?

A

Passive (doesn’t require energy to be carried out)

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14
Q

When will a cell become turgid?

A

When water moves into a cell and it’s full to capacity

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15
Q

When will a cell become plasmolysed?

A

A cell will become plasmolysed when water has moved out of the cell

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16
Q

What will happen when water enters an animal cell?

A

It will burst as it has no cell wall

17
Q

What will happen to an animal cell when water leaves?

A

It will shrink

18
Q

What is Active Transport?

A

Active transport is the movement of substances across a concentration gradient from a lower concentration gradient to a higher concentration using energy

19
Q

What does Active Transport require that diffusion and osmosis don’t?

A

Energy

20
Q

What allows the molecules to move from a lower concentration to a higher concentration in active transport?

A

A sodium/potassium pump