Transport Across The Cell Membrane

Question 1

The cell membrane is also know as the

Answer 1

Plasmid membrane

Question 2

Membranes age extremely thin and are made of

Answer 2

Phospholipids and proteins

Question 3

The lipids form two layers called a blank of molecules which are blank

Fill in the blanks

Answer 3

Bilayer

Mobile

Question 4

The arrangement of proteins are found scattered as a

Answer 4

Mosaic

Question 5

The phospholipid layers can move around the membrane so are said to be

Answer 5

Fluid

Question 6

The membrane is described as

Answer 6

Fluid-mosaic

Question 7

The cell membrane is selectively permeable which means

Answer 7

Not all molecules can pass through it

Question 8

Small molecules can pass through easily

Give three examples of small molecules

Answer 8

Oxygen, carbon dioxide and water

Question 9

Larger molecules can pass through slowly

Give two examples

Answer 9

Glucose and amino acids

Question 10

Very large molecules can’t pass through at all

Give two examples

Answer 10

Protein and starch (in plants)

Question 11

Small molecules pass through the selectively permeable membrane in three ways. Name them

Answer 11

1) Diffusion
2) Osmosis
3) Active transport

1&2 = passive processes; don't require        energy 
3 = not passive; does require energy

Question 12

Diffusion is the movement of molecules from a region of blank concentration to a region of blank concentration until the concentration becomes blank

Fill in the blanks

Answer 12

High
Low
Equal

Question 13

Molecules always diffuse blank a concentration blank

Fill in the blanks

Answer 13

Down

Gradient

Question 14

Respiration in the cell uses oxygen and produces what?

Answer 14

Carbon dioxide

Question 15

If carbon dioxide builds up in a cell it becomes

Answer 15

Toxic/poisonous

Question 16

It is vital the carbon dioxide diffuses blank of cells

Answer 16

Out

Question 17

Diffusion occurs in the

Answer 17

Lungs, the tissue and the digestive system

Question 18

In the digestive system blank molecules eg blank are broken down in to blank molecules eg glucose. The small molecules move front the digestive system into the blank through the blank

Fill in the blanks

Answer 18

Large
Starch
Small
Blood
Cell membrane

Question 19

Starch will turn iodine solution from

Answer 19

Brown to black/blue

Question 20

Glucose will turn the Clinistix from

Answer 20

Pink to purple

Question 21

Osmosis is a special type of

Answer 21

Diffusion

Question 22

Osmosis is the movement of blank from a region of high blank concentration to a region of low blank through a selectively permeable membrane

Fill in the blanks

Answer 22

Water molecules
High
Low

Question 23

Osmosis is a

Answer 23

Passive process

Question 24

Water molecules diffuse from a high water concentration to a region of low water concentration through the

Answer 24

Pores in the membrane

Question 25

Animal cells shrink when

Answer 25

Water has moved from hwc to lex

Question 26

Animal cells burst when

Answer 26

Water has moved into the cell

Question 27

A plant cell has plasmolysed when

Answer 27

Water moves from HWC to LWC

Question 28

A plant cell is turgid when

Answer 28

The water has moved from HWC to LWC

Question 29

Active transport is the process by which dissolved molecules and ions move across a cell membrane from

Answer 29

A low to high concentration

Question 30

In active transport particles move against a concentration gradient and therefore

Answer 30

Require an input of energy from the cell

Question 31

Cells that carry out active transport have

Answer 31

Many mitochondria

Question 32

What picks up specific molecules and takes them through the cell membrane against the concentration gradient?

Answer 32

Carrier proteins

Question 33

A carrier molecule actively pumps what out of the cell and what into the cell against its concentration gradient?

Answer 33

Sodium ions & potassium ions