Question

rate determining step...can someone help me bout this

Answer 1

obviously

Answer 2

sounds like chemistry to me.
if you have a mechanism that takes several steps to occur
the slowest step is rate determining, because it determines basically how long the entire process takes.

with a real life example, we can call a mechanism like.. driving a car across a bridge. say like. the golden gate bridge. driving across the bridge will take a few minutes, but it will take forever to wait at the toll booth. the toll booth then, is the rate determining step.