Cell transport & diffusion

Question 2

Role cell membrane

Question 3

Properties of molecules transported across cell membrane

Answer 3

The size of a molecule
Molecule’s solubility in lipids & water
The presence or absence of charge on a molecule

Question 4

Properties of molecules transported across cell membrane

Question 5

Properties of molecules transported across cell membrane

Question 6

Properties of molecules transported across cell membrane

Question 7

Transport mechanisms

Answer 7

Passive transport
Active transport

Question 8

Passive transport

Answer 8

Takes place when the are concentration, pressure or electrochemical gradients & it involves no energy from the cell

Question 9

Active transport

Answer 9

Involved in moving substances into & out of cells by adenosine triphosphate (ATP) which is produced during respiration

Question 10

Passive transport examples:

Answer 10

Diffusion
Facilitated diffusion
Osmosis

Answer 11

Diffusion is the net movement of molecules from a region of higher concentration to a region of its lower concentration down a concentration graded due to the kinetic energy of the molecules

Question 12

Active transport examples:

Answer 12

Active transport
Endocytosis
Exocytosis

Question 13

Facilitated diffusion

Answer 13

Strong positive or negative charge & large molecules move from high concentration to low concentration down a concentration gradient through carrier proteins or protein channels without ATP

Question 14

Facilitated diffusion: proteins

Answer 14

1 channel protein
2 carrier protein

Question 15

Channel protein

Answer 15

Form pores through the membrane

Question 16

Carrier protein

Answer 16

Float on the surface of cell membrane

Question 17

1 channel protein

Answer 17

Each type of channel protein allows one particular type of molecule to pass through this depends on molecules shape & charge