Two students were testing the amount of fertilizer that would best promote the growth of tomato plants in a garden. which of the following could be an unavoidable source of experimental error?
a. time given to the experiment
b. variation of tomato plants
c. amount of water given to the plants
d. fertilization during the experiment
answer

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.