During the action of a sodium-potassium pump, 50 atp molecules were spent. predict how many sodium ions are transported across the cell membrane.
a) 50
b) 100
c) 150
d) 200

 As we knw that ATP molecule allows 3 Na+ to move out of the cell and 2 K+ will definitely  enter. So as a result  50 ATP molecules allow 150 Sodium ions to move out and therefore allows 100 Potassium ions to move in
so i conclude option C is correct
hope it helps

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.