D) a change in protein synthesis
Substrate molecules would just bounce off and move along because each enzyme is like a key to the active site. so if the 'key' doesn't fit the 'lock' then nothing will happen<span />
I would say that the most likely answer is C.
While B and D could happen that are too vague and non-descript, A is completely wrong.
when a cold front overtakes a warm front
when two different air masses meet. A front is usually either cold or warm based on the way the masses are colliding which can either result in a drop or an increase in temperature. This is useful because this is how cyclones work and this can help with seeing precipitation patterns that will occur.
