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Flashcards in Transport across a cell membrane Deck (14)
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1

What is actve transport?

the movement of molecules and ions across a cell membrane against a concentration gradient. It requires energy and they are moved by carrier protiens. The energy is provided by ATP

2

What substances can travel using active transport

Glucose and iodine

3

What would happen to a leaf cell when placed in a concentrated sugar or salt solution

The water would leave the cell and become smaller

4

What would happen to a red blood cell when in a water solution?

Water would go into the cell and burst it

5

What is osmosis?

Movement of water molecules from a region of high to low water concentration

6

What happens to a cell when placed in a isotonic solution

No change

7

Why can glucose move across the cell membrane but not starch

Glucose is smaller in size then starchy; starch is too big to pass through

8

Name 4 substances that can move by diffusion

Oxygen, Carbon Dioxide, Glucose and urea

9

What is diffusion?

Diffusion is he movement of molecules or ions from a region of high to low concentration

10

What is diffusion used for?

Diffusion allows substances to move within a cell from one area to another as well as allowing material to enter and leave a cell. Diffusion continues until the concentration of substance is even throughout

11

What is the function of the cell membrane

The function of the cell membrane is to control which substances enter and leave the cell- they are said to be selectively permeable

12

What are substances that can pass through the membrane?

Fatty acid, Amino Acid, Glucose, Oxygen, Carbon Dioxide

13

What are substances that can't pass through the membrane

Starch, proteins, and fats

14

What is the cell membrane made off?

Lipids (liquid fat) and proteins