Question

question 29
match the following terms with the correct definition
column a

1. operator
2. operon
3. promoter
4. gel electrophoresis
5. polymerase chain reaction

column b
a. 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
b. a unit made up of linked genes which is thought to regulate other genes responsible for protein synthesis.
c. the site on the dna where rna polymerase binds in order to start transcription.
d. the site on the dna where a repressor protein binds and blocks the rna polymerase from making mrna.
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.

Explanation:

• Operator: It is the site on the DNA where a repressor protein binds and blocks the RNA polymerase from making mRNA. So, operator matches with d.
• Operon: A unit made up of linked genes which is thought to regulate other genes responsible for protein synthesis. So, operon matches with b.
• Promoter: The site on the DNA where RNA polymerase binds in order to start transcription. So, promoter matches with c.
• Gel electrophoresis: 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. So, gel electrophoresis matches with e.
• Polymerase chain reaction: 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. So, polymerase chain reaction matches with a.

Answer:

1. d
2. b
3. c
4. e
5. a