Which step in PCR (polymerase chain reaction) is responsible for opening and unwinding the DNA strand to be analyzed? A) binding
B) elongation
C) denaturation
D) annealing

Four types of motile cells in human body?

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system