when an enzyme affects a biological reaction,

a) it is consumed
b) it is not used up
c) more enzyme is made
d) it's concentration changes

in advanced ^_^

Enzymes are very effective in fastening up biochemical reactions. They can catalyze up to several million responses per second. As a result to which, the variation in speeds of biochemical reactions with and without enzymes may be immense. A normal biochemical reaction possibly take hours or regular days to happen under typical cellular conditions without an enzyme, but fewer than a

47

explanation:

ok

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.