1. moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element? a. isotope number b. atomic number c. atomic mass unit d. mass number

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."

d. planting trees

the trees take in carbon to make oxygen.