Study the schematic representation of the genes involved in the lac operon given below and answer the questions that follow:

The active site of enzyme permease present in the cell membrane of a bacterium has been blocked by an inhibitor, how will it affect the lac operon?

Study the schematic representation of the genes involved in the lac operon given below and answer the questions that follow : {:(p,i,p,o,z,y,a):} (a) Identify and name the regulatory gene in this operon. Explain its role in 'switching off' the operon. (b) Why is the lac operon's regulation referred to as negative regulation ? (c ) Name the inducer molecule and the products of the genes 'z' and 'y' of the operon. Write the functions of these gene products.

Study the diagrammatic representation of S.L. Miller's experiment given below and answer the questions that follow: (a) How did S.L. Miller create the conditions which existed before the origin of any life on Earth (b) Name the organic compound formed and collected at the end of his experiment. (c)Mention the kind of evolution is experiment supports

Study the following table carefully and answer the questions given below ? By how many approximate percent points in the total approvals, the share of UK has grown over the given period ?

Study the figure given below and answer the questions : (a) What does the figure express ? (b) When does the transcription of lac mRNA stop ? ( c) Name the enzyme transcribed by the gene 'Z'.

With reference to the above schematic representation of (a) SQPermatogenesis and (b) Oogenesis answer the following questions: (a) About 300 million SQPermatozoa may be present in a human male ejaculation at one time. Calculate how many SQPermatocytes will be involved to produce 300 SQPermatozoa. (b) How many chromatids are found during Oogenesis in (i) Primary oocyte and (ii) First polar body in a human female?

Study the figure given below and answer the questions: (i) How does the repressor molecule get inactivated? (ii) When does the transcription of lac mRNA stop? (iii) Name the enzyme transcribed by the gene Z'.