Gene Structure And Regulation

Question 1

Structural genes

Answer 1

Gene that codes for proteins and rna molecules that aren’t involved in gene regulation.

Question 2

Regulatory gene

Answer 2

A gene that codes for transcription factors.

Question 3

Transcription factors

Answer 3

Proteins that control gene expression by binding to DNA sequences close to the promoter region of a gene/ rna polymerase to induce or repress the expression of specific genes.

Question 4

promoter

Answer 4

upstream region of a gene to which rna polymerase attaches, initiating transcription.

Question 5

Start instructions

Answer 5

Aug

Question 6

Stop instructions

Answer 6

Uaa, uag, Uga

Question 7

Why is the genetic code degenerate?

Answer 7

Because more than one codon can code for the same amino acid.

Question 8

Lac operon

Answer 8

Contains the genes that code for three proteins involved in the metabolism of lactose in e.coli and a few other bacteria. It is an inducible operon and its genes are transcribed only when lactose is available.