The differentiation of organs and tissues in a developing organism is associated with:

Identify the $INCORRECT$ statement with reference to the regulation of gene expression.

Wild-type $E. coli$ cells are grown in a normal medium containing glucose. They are then transferred to a medium containing only lactose as the sugar source. Which of the following changes will occur?

$A$ gene that is responsible for the synthesis of a polypeptide chain is called a .......

During $DNA$ transcription,$mRNA$ is usually single-stranded. However,sometimes an $RNA$ molecule is produced that is complementary to the $mRNA$. This is called ...... and its function is to ...... .

Define an operon,give an example,and explain an inducible operon.