Carbon tends to form four bonds. What kind of bonds are they?
O A. Covalent
O B. Ionic
O C. Hydrogen
O D. Metallic

answer; ///(b) it is composed of four protein chains and four heme groups;

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."