Here are the matches between the terms in Column A and their definitions in Column B:
- operator - a. the site on the DNA where a repressor protein binds and blocks the RNA polymerase from making mRNA.
- operon - d. a unit made up of linked genes which is thought to regulate other genes responsible for protein synthesis.
- promoter - c. the site on the DNA where RNA polymerase binds in order to start transcription.
- gel electrophoresis - e. a technique used to separate DNA fragments according to their size. DNA samples are loaded into wells (indentations) at one end of a gel, and an electric current is applied to pull them through the gel.
- polymerase chain reaction - b. a method widely used in molecular biology to rapidly make millions to billions of copies of a specific DNA sample allowing scientists to take a very small sample of DNA and amplify it to a large enough amount to study in detail.