Chapter 18: Gene Expression

Question 1

Operon consists of…

Answer 1

a promoter, operater, and structural genes

Question 2

Promoter

Answer 2

where RNA polymerase attaches signalling the start of the gene

Question 3

Operator

Answer 3

where a repressor binds, stopping the transcription of that gene

Question 4

Structural Genes

Answer 4

genes coding for the enzyme, transcribed as a unit

Question 5

TRYP Operon in E.Coli

Answer 5

exsists in the “ON” state, controls production of tryptophan

Question 6

LAC Operon in E.Coli

Answer 6

exsists in the “OFF” state, turns on when lactose is present

Question 7

Repressible Operon

Answer 7

is normally ON but can be turned off (TRYP OPERON)

Question 8

Inducible Operon

Answer 8

is normally OFF but can be turned on (LAC OPERON)

Question 9

Recombinant DNA Tech

Answer 9

DNA from different sources is combined (human DNA + bacterial DNA)

Question 10

Polymerase Chain Reaction (PCR)

Answer 10

creates millions of copies of a gene (or segment of DNA) using DNA polymerase

Question 11

Gene Amplification

Answer 11

DNA must be heated to seperate strands