gene regulation

In E.Coli, the lac operon gets switched on when

• lactose is present and it binds to the repressor

• repressor binds to operator

• RNA polymerase binds to the operator

• lactose is present and it binds to RNA polymerase

The lac operon consists of

• four regulatory genes only

• one regulatory and 3 structural genes

• two regulatory genes and 2 structural genes

• 3 regulatory genes and 3 structural genes

In lac operon I gene codes for

• inducer of lac operon

• repressor of lac operon

• hydrolysis

• permease

The most common promoter sequence in eukaryotes is

• CAAT

• TATA

Hair pin loop is formed in

• prokaryotes

• eukaryotes

The non coding sequences are known as

• introns

• exons

Where is the poly A tail added

• 5' end

• 3' end