If you consider the combined processes of photosynthesis and cellular respiration, the electrons found in H 2O at the beginning of the light reactions end up attaching to during respiration.

to form

Explanation:

The electrons start their journey through metabolism in and end in the that is made.   serves as the final electron acceptor in oxidative phosphorylation, so as to combine with protons to make new "metabolic" water.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.