gene regulation and the trp operon

Question 1

gene

Answer 1

a section of a strand of DNA, contains information to code for a protein

Question 2

regulatory sequence

Answer 2

section of DNA upstream of a gene that is capable of increasing or decreasing the expression of specific genes within an organism.

Question 3

promoter region

Answer 3

where RNA polymerase binds

Question 4

enhancer/silencer

Answer 4

regionwheretranscription factors can bind

Question 5

UTR

Answer 5

stands for untranslated region located on each side of a coding sequence (this section is transcribed but not translated)

Question 6

promoter region

Answer 6

are sections of a gene that are found before the start triplet on the 5’ end of DNA strand

Question 7

Promotors

Answer 7

determine the site of transcription and direct the binding of
RNA polymerase

Question 8

• Structural genes

Answer 8

genes that code for proteins that become part of the structure and functioning of an organism.
• The proteins produced by structural genes do not control other genes

Question 9

operon

Answer 9

stands for a group of genes with a single promotor and leader meaning that all the genes in the group are transcribed as a single mRNA molecule

Question 10

operator

Answer 10

a short DNA segment that forms the binding site for a transcription factor, in this case trp repressor

Question 11

leader

Answer 11

sequence of nucleotide bases with regulatory activity

Question 12

attenuator

Answer 12

mRNA transcription termination site made up of multiple Adenine-
Uracil base pairs

Question 13

trp operon

Answer 13

The regulation of the trp operon is determined by the concentration of tryptophan. Transcription is turned off when a high concentration of tryptophan is present, and is turned on when tryptophan is absent.

Question 14

two levels of regulation

Answer 14

• transcription repression
• attenuation