Cell Membranes Flashcards

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1
Q

What is a cell membrane?

A

It encloses everything in a cell.

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2
Q

Where does the cell membrane lie in a plant cell?

A

Again the inside of the cell wall.

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3
Q

What is a cell membrane made up of?

A

Protein and Lipids (fats) molecules

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4
Q

What is diffusion?

A

Diffusion is the movement of a substance from an area where it is HIGH concentration to where it is in a LOW concentration, until evenly spread.

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5
Q

Example of Diffusion?

A

-Oxygen entering a cell for respiration
-Carbon Dioxide leaves cell
-Digested food enters

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6
Q

What is the concentration gradient?

A

The difference in concentration that exists between an area of HIGH concentration and LOW concentration.

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7
Q

What is passive transport?

A

When diffusion requires NO energy input from cells.

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8
Q

What is osmosis?

A

Diffusion of WATER from an area where its in HIGH concentration to an area where it is in LOW concentration through a SELECTIVELY PERMEABLE MEMBRANE.

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9
Q

Is Osmosis passive transport?

A

Yes. It does not use up energy therefore it is passive.

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10
Q

OSMOSIS IN ANIMAL CELLS!!!
A. Red blood cell placed into pure water?
B. Placed into isotonic solution?
C. Placed into salt solution?

A

A. Water moves into cell - Cell bursts (Haemolysis)
B. Water moves in and out equally - No net change
C. Water does out of cell - Cell shrivels (Crenated)

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11
Q

OSMOSIS IN PLANT CELL!!!
A. Plant cell placed into pure water?
B. Placed into isotonic solution?
C. Placed in salt solution?

A

A. Water moves into cell - Cell becomes turgid
B. Water moves in and out equally - No net change
C. Water moves out of cell - Cell is plasmolyse

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12
Q

Passive transport examples ?

A

Diffusion and Osmosis require no energy

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13
Q

What happens in Passive transport?

A

Molecules simply move from an area of HIGH concentration to an area of LOW concentration.

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14
Q

What is Active transport?

A

The movement of molecules from an area of LOW concentration to an area of HIGH concentration against a concentration gradient.

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15
Q

Does Active transport require energy?

A

Yes!

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16
Q

What is the role of the plasma membrane in active transport?

A

Certain proteins in the plasma membrane act as carrier molecules.

17
Q

How is energy for the role of the plasma membrane provided?

A

It is provided by ATP (Adenosine Triphosphate), which is formed during respiration.

18
Q

Example of active transport in a plant cell?

A

Valonia Ventricosa is a small marine algae which can move ions AGAINST a concentration gradient.