Question

Draw a schematic diagram of lac operon in its ‘switched off’ position. Label the following: 

i. The structural genes 

ii. Repressor bound to its correct position 

iii. Promoter gene 

iv. Regulatory gene.

Answer 1

The lac operon 

i. z, y and a are structural genes. 

ii. p is the promoter sequence. 

iii. i is the regulatory gene.