Question

Which of these REQUIRES active

transport in order to cross the plasma
membrane?
A. a sodium ion moving AGAINST the concentration gradient
B. a hydrogen molecule moving WITH the concentration
gradient
C. an oxygen molecule moving WITH the concentration
gradient
D. a carbon dioxide molecule moving WITH the concentration
gradient

Answer 1

The answer would be c

Answer 2

Answer: I think it might be A. a sodium ion moving AGAINST the concentration gradient

Step-by-step explanation: