Cell Transport Flashcards

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1
Q

What is simple diffusion?

A

The net movement of molecules from an
area of high concentration to an area of
low concentration down a concentration
gradient

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2
Q

What molecules enter and leave cells via simple

diffusion through the cell membrane?

A

Small molecules e.g. oxygen, water,

glucose, amino acids

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3
Q

What factors affect the rate of diffusion? (3)

A

● Temperature
● Concentration gradient
● Surface area (to volume ratio) of cell membrane

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4
Q

Define osmosis

A

The net movement of water molecules from
an area of high water concentration to an
area of low water concentration through a
partially permeable membrane

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5
Q

What is active transport?

A

The movement of molecules across a cell
membrane from an area of low concentration
to an area of high concentration, against the
concentration gradient, using energy

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6
Q

How is a percentage change in mass calculated?

A

% change = (final mass - initial mass)/initial mass x 100

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7
Q

Define concentration gradient

A

The difference in concentration between two areas

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8
Q

What happen when the concentration of both solutions are equal in Osmosis?

A

There will be no net movement of water molecules.

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