transport in cells

Question 1

why to cells need to transport substances

Answer 1

waste products
products for respiration

Question 2

what do cells need for cellular respiration

Answer 2

chemicals like glucose and oxygen

Question 3

role of cell surface membrane

Answer 3

controlles transport of materials in and out of the cell

Question 4

glycoproteins

Answer 4

act as antigens
important for cell recognition
receptors for hormones
neurotransmitters
reactions with a cell/ cascade

Question 5

peripheral proteins

Answer 5

may be enzymes
involved in regulating transport
cell signalling

Question 6

membrane bi layer

Answer 6

polar heads inside and outside with hydrophobic lipid core
layer contains integral proteins

Question 7

hydrophillic part of bi layer

Answer 7

pore
hydrophillic channel

Question 8

integral proteins

Answer 8

main transportation
form either stable pores or other transport mechanisms like carrier proteins or active pumps

Question 9

what do glysoproteins have attached to them

Answer 9

carb chains

Question 10

passive transport

Answer 10

takes place as a result of concentration
pressure
electrochemical gradients
no energy

Question 11

diffusion

Answer 11

movement of particles in a liquid or gas down conc gradient.
high to low conc

Question 12

what effects transportation of molecules

Answer 12

properties of the membrane
size of molecule
solubility in lipids and water
charge of molecule

Question 13

what types of substances can move easily past membrane

Answer 13

oxygen
carbon dioxide

Question 14

molecules that cant diffuse across membrane

Answer 14

steroid hormones
charged particles

Question 15

order of movement in diffusion

Answer 15

they move down conc gradient because of random movement of molecules due to temp

Question 16

whats uniform distribution

Answer 16

when you have large packed molecules they will move spreading out until spread out

Question 17

movement after equilibrium reached

Answer 17

after standard reached the molecules move but the movement doesnt cause a net change in conc because equal numbers are moving in all directions

Question 18

what does facilitated diffusion include

Answer 18

proteins in the membrane that allow only specific substances to move through passively down their conc gradient

Question 19

process of channel proteins in facilitated diffusion

Answer 19

molecules to be transported
-move into protein carrier of specific shape
-protein changed shape and molecule passed through
-protein carrier returns to original shape

Question 20

gated channels

Answer 20

only open when a specific molecule is present or there is an electrical change across membrane