In a biological reaction involving and enzyme the substrate binds to

a. the active site of an enzyme

b. the active of another substrate

c. the inactive site of an enzyme

d. the inactive site of another substrate

I took the test the answer is A the active site of an enzyme

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms