Active transport performs which function in a cell?
a. packages proteins for export from the cell
b. distributes enzymes throughout the cytoplasm
c. moves substances against a concentration gradient
d. equalizes the concentration of water inside and outside the cell

Moves substances against a concentration gradient.(Ans. C)

Explanation:

Active transport is defined as movements of molecules against a concentration gradient across a membrane from lower concentration to higher concentration, which requires the cell energy harvested from the ATP which is obtained from cellular metabolism.

Such metal ions include Mg+, K+, Ca+, Na+ these are transported across the cell membrane via active transport. These metal ions cross the cell membrane with the help of ion channels and pumps.

Primary active transport uses adenosine triphosphate and secondary active transport uses electrochemical gradient as an energy source.

vodka and hennesy

explanation:

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.