KA1.2 - Transport Across Cell Membranes Flashcards

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1
Q

The cell membrane consists of … and …

A

Proteins and phospholipids

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2
Q

A phospholipid and protein look like?

A

The phospholipid has a circular head with two legs

O=

A protein looks like a circular blob

0

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3
Q

How are passive and active transport different?

A

Passive transport does not need energy and movement is from a High concentration to Low concentration. Active transport does need energy and moves from a Low concentration to High concentration

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4
Q

What is the definition of diffusion?

A

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

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5
Q

What is the definition of osmosis?

A

where water molecules move from a high water concentration to a low water concentration down a concentration gradient through a selectively permeable membrane

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6
Q

What are the two differences between diffusion and osmosis?

A

Osmosis needs a selectively permeable membrane and is the movement of only water

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7
Q

The two examples of passive transport are … and …

A

Osmosis … diffusion.

Neither osmosis or diffusion require energy as they move from a High concentration to a Low concentration.

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8
Q

An animal cell will … if placed in a higher water concentration than inside the cell

A

Burst.

There is a concentration gradient moving into the cell from High concentration outside to Low concentration inside

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9
Q

What happens to an animal cell if it is placed into a solution with a lower water concentration that inside the cell?

A

Shrink.

There is a Low concentration outside the cell and High inside, so the water leaves the cell.

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10
Q

A plant cell will become … if placed in a higher water concentration than inside the cell

A

Turgid.

The water moves into the cell

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11
Q

What does plasmolysed mean?

A

It is a plant cell that has had the water leave it, as there was a high concentration inside the cell and low outside.

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12
Q

A … cell experiences turgid and plasmolysed states due to water moving in and out of the cell.

A

Plant cell

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13
Q

…. transport requires energy to move molecules against the concentration gradient from an area of … concentration to an area of high concentration.

A

Active transport requires energy to move molecules against the concentration gradient from an area of low concentration to an area of high concentration.

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14
Q

In the cell membrane, membrane …. are required for active transport

A

Membrane proteins. Are proteins found in the cell membrane that act as buses to move molecules from one side of the cell membrane to the other, against the concentration gradient.

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