Why does passive transport not require the cell to use energy to move molecules across the
membrane?
the molecules use protein pumps to move molecules across the membrane
the molecules are moving against the concentration gradient
the molecules use water to move across the plasma membrane,
the molecules are moving from high concentration to low concentration
finish

Option D

Explanation:

The passive transport can be defined as the process by which the ions and other atomic molecular substances across membrane without the need of energy.

Energy is not required during the process of passive transport because the the molecules or ions move from a region where it is having more concentration to a region where it has a less concentration.

Energy is required in the movement of the ions or molecules against the concentration gradient.

This is why the passive movement of molecules does not requires energy.

your answer is c) plasma

~*"auba14"*~

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o