a. transport of Na+ down its concentration
gradient
b. transport of proline (amino acid) from where it
is in a high concentration to where it is in a low
concentration
c. transport of Ca+ against its concentration
gradient
d. all of the above
ty in advance
gradient
b. transport of proline (amino acid) from where it
is in a high concentration to where it is in a low
concentration
c. transport of Ca+ against its concentration
gradient
d. all of the above
ty in advance
-
Active transport is usually always against the concentration gradient, so C is correct.