Gene Control Mechanisms

Question 1

Operon

Answer 1

A cluster of genes under the control of one promoter and one operator site

Question 2

Lac Operon

Answer 2

A gene cluster that codes for enzymes. Involved in the metabolism of lactose. First cluster found.

Question 3

Promoter

Answer 3

Starting point of a gene.

Question 4

Terminator

Answer 4

End point of the gene sequence.

Question 5

Operator (Lac O)

Answer 5

Controls expression of the operons mRNA because it can be impacted by other molecules.

Question 6

Lac I

Answer 6

Codes for an allosteric repressor protein.

Question 7

Lac Z

Answer 7

Codes for a protein called B-Galactosidase which breaks lactose into glucose and galactose.

Question 8

Lac Y

Answer 8

Codes for B-Galactosidase permease protein which integrates into the cell membrane to increase lactose diffusion into the cell.

Question 9

Lac A

Answer 9

Codes for Thiogalactosidase transacetylase which has no known function.

Question 10

Housekeeping Genes

Answer 10

Genes transcribes into mRNA to produce proteins that are required ALL the time.