Cp 13 Basics of transport

Question 1

Is K+ or Na+ higher inside the cell

Answer 1

Intracellularly K+ concentration is higher

Question 2

Is K+ or Na+ higher on the outside of the cell

Answer 2

Extracellularly Na+ concentrations are greater than K+

Question 3

[Na+] > [K+] out side of the cell T or F

Answer 3

True

Question 4

[K+] > [Na+] inside the cell T or F

Answer 4

True

Question 5

Glucose is > outside the cell than in T or F

Answer 5

True

Question 6

Intracellularly proteins are found in greater concentrations T or F

Answer 6

True

Question 7

In simple/passive diffusion what is the rate dependent on?

Answer 7

the degree of lipid solubility - there is no pore of protein channel so the molecule being transported must go through the lipid bilayer

Question 8

in facilitated diffusion ______ and ____ determine the selectivity of the pore or channel

Answer 8

pore diameter and electrical charges on the AAs

Question 9

What types of molecules use facilitated diffusion

Answer 9

water and other lipid insoluble compounds must use protein channels

Question 10

What type of diffusion channel is regulated by chemicals that bind channel proteins

Answer 10

ligand gated

Question 11

What channel contains pore loops that act as a selectivity filter for K+

Answer 11

Potassium channels

Question 12

Sodium channels are lined with highly positive amino acids and have an opening that is 0.3-0.5 nm in diameter T or F

Answer 12

False - they are lined with highly negative amino acids that attract sodium though they do have an opening that is 0.3-0.5 nm in diameter

Question 13

Addition of more substrates that rely on facilitated diffusion/carrier proteins will increase the rate of transport T or F

Answer 13

False. Transport proteins can only move what they can bind. If all available transport proteins are bound to substrate the protein has hit it’s Vmax

Question 14

Does facilitated diffusion use ATP?

Answer 14

NO

Question 15

Km = ?

Answer 15

the solute concentration that will give 1/2 the Vmax of a transport protein

Question 16

Water moves from high concentration to low concentration true or false?

Answer 16

True

Question 17

Movement with a concentration gradient is considered ______ diffusions

Answer 17

passive diffusion

Question 18

Movement against a concentration gradient is considered ________

Answer 18

active transport

Question 19

Isotonic pressure is ______

Answer 19

same inside cell as outside

Question 20

hypotonic osmotic pressure is ______ and H2O moves ______

Answer 20

greater in the cell and water moves into the cell

Question 21

Hypertonic osmotic pressure is ______and H2O moves ____

Answer 21

greater outside the cell and water moves out of the cell