cell membrane part2

Question 1

2 types of membrane transport:

Answer 1

passive transport

active transport

Question 2

how require energy (passive/active transport)?

Answer 2

active transport

Question 3

the concentration in active transport and passive transport

Answer 3

active : low to high

passive: high to low

Question 4

types of passive transport

Answer 4

facilitated diffusion
simple diffusion
osmosis diffusion

Question 5

what is diffusion?

Answer 5

The process of random movement toward equilibrium.

Diffusion is the net movement from regions of greater to lesser concentration.

Question 6

What is Equilibrium?

Answer 6

equal concentration on both side of the membrane

Question 7

diffusion rate(faster/slower) depends on what?

Answer 7

temperature - surface area - concentration gradient - size of particles - diffusion medium(solid/ liquid/gas)

Question 8

simple diffusion

Answer 8

• small molecules pass through the lipid bilayer
• water and lipid-soluble molecules can diffuse across the membrane.
• electrically charged and polar molecules can not pass through easily.

Question 9

facilitated diffusion

Answer 9

-move big polar molecules through protien

Question 10

types of facilitated diffusion and what are they?

Answer 10

• carrier protein(integral membrane proteins): have a central pore
• Channel protein: membrane proteins that bind some substances and speed their diffusion through the bilayer
• ion channel:

Question 11

Osmosis diffusion

Answer 11

the diffusion of water across a permeable membrane

Question 12

Osmosis Can Modify the Shapes of Cells (isotonic/ hypertonic/ hypotonic)

Answer 12

• isotonic: remain the same size
• hypertonic: more solute(NaCl outside the cell), water move from inside to out side the cell making it shrimp/shrink
• hypotonic: less solute(NaCl inside the cell), water move outside to the cell making it burst/ bigger.

Question 13

facilitated diffusion

Answer 13

-move big polar molecules through protien

Question 14

types of facilitated diffusionand what are they??

Answer 14

• carrier protein(integral membrane proteins): have a central pore
• Channel protein: membrane proteins that bind some substances and speed their diffusion through the bilayer
• ion channel: specific channel proteins with hydrophilic pores; allow the transport of ions such as k+ . most are gated—can be closed or open to ion passage.

Question 15

Active transport is directional (moves substances either in or out). It involves three kinds of proteins:

Answer 15

1. Uniporter- moves a single substance in one direction
2. Symporter- moves two substances in the same direction
3. Antiporters- moves two substances in opposite direction
   e. g. a sodium/potassium pump, moves Na+ out and K+ in

Question 16

sodium/ potassium pump

Answer 16

1. protein have 3 sites Na binds with
2. ATP give energy and male th protein open to outisde of cell
3. K ions bind in the 2 site
4. phosphate group is released from the protien
5. protien return to shape open from inside, releasing K in the cell
6. moving low concentration of molecules to High concentration
7. the process repeats

Question 17

primary active transportation-

secondary active transportation-

Answer 17

• require ATP to move substance
  eg. sodium/potasuim pump
• Energy comes from an ion concentration gradient that is established by primary active transport.
  eg. sodium/ glucose transport

Question 18

Sodium Potassium pump –

Answer 18

Primary active transport