L2: Cell membrane transport

Question 1

most integral proteins are____

Answer 1

glycoproteins

Question 2

what are the functions of glycoprotiens and glycolipids ?

Answer 2

self-identity markers 
antigen like
cellular attachment 
receptors 
involved in immune reaction

Question 3

what type of substance can be transported through simple diffusion ?

Answer 3

liquid soluble substances
water
small and large uncharged molecules
ions

ions and large molecules travel slowly through the membrane

Question 4

what is the difference between a leakage channel and a gated channel ?

Answer 4

leakage channels are always opened while gated channels have gates that open and close based on either voltage of cell or chemically gated

Question 5

what makes facilitated diffusion different from simple diffusion ?

Answer 5

facilitated diffusion involves a carrier ( carrier mediated transport )

Question 6

what is tonicity and what are the different categories of it ?

Answer 6

tonicity is the ability of a solution to cause change in the cell volume

1.) hypertonic: solution increases extracellular osmolarity ; moves out of the cell causing it to shrink

isotonic : no change

hypotonic : decreases extracellular osmolarity : water moves into cell causing it to swell then burst

Question 7

what is the difference between primary and secondary active transport?

Answer 7

primary active transport uses energy directly from ATP while secondary active transport uses energy indirectly from ATP