Diffusion of a charged molecule across membranes is: (active/passive/not relevan

Question

Diffusion of a charged molecule across membranes is: (active/passive/not relevant) (concentration dependent/concentration independent/not relevant) (thermodynamically driven/not thermodynamically driven/not relevant) (depends on electrochemical potential/does not depend on electrochemical potential/not relevant) Diffusion of an uncharged molecule across membranes is: (active/passive/not relevant) (concentration dependent/concentration independent/not relevant) (thermodynamically driven/not thermodynamically driven/not relevant) (depends on electrochemical potential/does not depend on electrochemical potential/not relevant) (For the following questions, (c) - (e), circle the correct answer from the choices given - one choice per line 1 or 2 lines) What is active transport in mammals? (concentration dependent, from low to high/concentration dependent, from high to low/not relevant) (needs ADP hydrolysis/needs ATP hydrolysis/energy not needed) The sodium pump: (transports Na^+ and K^+/uses light as an energy source/uses ATP as an energy source/transports H^+ and Cl^-) The gastric H^+, K^+ pump: (transports Na^+ and K^+/uses ADP as an energy source/uses ATP as an energy source/transports H^+ and Cl^-)

Explanation / Answer

a. Diffusion of charged molecules across membrane is,

Passive diffusion

concentration dependent

not thermodynamically driven

depends on electrochemical potential

b, Diffusion of an uncharged molecule across membrane is,

active diffusion

concentration dependent

thermodynamically driven

depends on electrochemical potential

c. Active transport in mammals,

concentration dependent, from low to high

needs ATP hydrolysis

d. The sodium pump,

transports Na+ and K+

used ATP as an energy source

e. The gastric H+ and K+ pump,

Transports H+ and Cl-

uses ATP as an energy source

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