how substances cross using active processes

Question 1

What is endocytosis

Answer 1

bulk transport of molecules too large to pass through the plasma membrane, into a cell

Question 2

what is exocytosis

Answer 2

the bulk transport of molecules too large to pass through the plasma membrane, out of a cell

Question 3

define active transport

Answer 3

movement of substances against the concentration gradient using atp or proteins

Question 4

why is ATP described as the universal energy currency

Answer 4

All cells use it to supply their energy needs

Question 5

What feature of carrier proteins allow them to act as an enzyme

Answer 5

They have a specific binding region to allow the hydrolysis of ATP to release energy- means they also act as an enzyme

Question 6

what energy do carrier proteins need to change shape, to carry ions from one side of the membrane to the other

Answer 6

atp molecule

Question 7

what is bulk transport

Answer 7

a process requiring atp, where large quantities of substances and molecules are moved across a membrane

Question 8

what type of active proces is phagocytosis

Answer 8

endocytosis- engulfs pathogen into a phagosome (vesicle)

Question 9

what is the difference between pinocytosis and phagocytosis

Answer 9

pinocytosis- intake of liquid matter

phagocytosis- intake of solid matter

Question 10

Does forming a vesicle and moving it around a cell require atp

Answer 10

Yes, atp is needed to form vesicles and transport them around the cell

Question 11

describe the action of exocytosis

Answer 11

vesicle containing substance is moved towards phospholipid bilayer

cell surface membrane and membrane of vesicle fuse

the fused site opens, secreting substances from the vesicle