Question

QUESTION 24

1. If you are studying a bacteria that has 3 genes in an operon with a constitutive promoter and you cause a mutation that turns off the expression of the first gene in the operon, what do you predict will happen to expression of the the third gene in the operon?

   	A.	It will also not be expressed
   	B.	its espression will not be altered
   	C.	It will be expressed in larger amounts
   	D.	none of these

QUESTION 25

1. In a multicellular eukaryotic organism, gene expression is the same in every type of cell.

   A. True

   B. False

QUESTION 26

1. If a mutation was made in an operon where the repressor was ALWAYS bound to the operator, what would you predict about expression of the genes in the operon.

   	A.	It would depend on the concentration of lactose
   	B.	Their expression would remain turned on
   	C.	Every other gene would be expressed
   	D.	Their expression would remain turned off

Answer 1

Ans-24)a) it will also not expressed

Explaination:

Constitutive promoter means all three genes are under one promoter so stoping functioning of one gene is caaused by modification in promoter than expression of operon stopped so other gene also do not express.

Ans-25) False

Explaination:All eukaryotic cell have similar type of genes but in each cell different gene expression take place according to function and need of cell.

Ans-26) b) Their expression would remain turned on

Explaination:

if mutation in operon where represor binds ie operator leads to constitutive expression of operon because repressor is unable to bound to operator to prevent RNA polymerase binding to promoter so result in binding of RNA poly to promoter and expression goes on with or without inducer.