passive and active transport

Question 1

osmosis

Answer 1

The passive net movement of free water molecules through a semipermeable membrane from a region of high concentration water to a lower water concentration.

Question 2

simple diffusion

Answer 2

Passive net movement of molecules from a region of higher concentration to a region of lower concentration of that substance. Small, non- polar, non charged

Question 3

facilitated diffusion

Answer 3

Passive net movement of molecules down a concentration gradient across the plasma membrane by a carrier or channel transport protein.
• More rapid than simple diffusion
• Transport is selective, transport proteins can become saturated and one
particle may inhibit another that uses the same transport protein
• Used for larger molecules and polar/ hydrophilic molecules


Question 4

active transport

Answer 4

Cells actively transport substances across a membrane against the concentration gradient using energy released from ATP.
• Is performed through carrier proteins


Question 5

Bulk transport (endocytosis/endocytosis)

Answer 5

The movement of macromolecules such as proteins or polysaccharides into or out of the cell is called bulk transport.

• if the item is moved from outside the cell to inside, the bulk transport is referred to as endocytosis.
• if the item is moved out of the cell, it is called exocytosis.