In lac. operon if y gene undergoes in silent mutation then what changes we observe during expression of structural gene.
(A) no any enzyme synthesis will occur
(B) permease enzyme will synthesise only
(C) only beta galactosidase will synthesise
(D) no change occur in enzyme synthesis by structural gene

Read the following statements for lac operon: i. Each operon has its specific operator and specific repressor. ii. The y gene codes permease, which increases the permeability of the cell to beta-galactosides. iii. Regulation of lac operon can be visualized as regulation of enzyme synthesis by its substrate. Select the option with the correct statements.

A gene that takes part in synthesis of polypeptide is (a) Structural gene (b) Regulator gene (c) Operator gene (d) Leading strand

Which of following statement is true for lac operon in E-coli (a) lac operon consists of one regulatory gene and five structural gene. (b) The i gene codes for inducer (c) The z-gene codes for beta -galacosidase (d) A very low level of expression of lac operon has to be present in cell all the time

Repressible operon system is usually found in (i)____ pathways. The pathway's end product serves as a (ii) ______ to activate the repressor, turn off enzyme synthesis and prevent overproduction of the end product of the pathway. Genes for this operon are usually switched (iii)_____ and the repressor is synthesised in an (iv)_____ .

Identify the correct statement w.r.t. the given cell A. Concerned with lipid and steroidal hormone synthesis B. Outer non- living rigid structure which gives shape to the cell and protects from mechanical damage and infaction . C. Both lie perpendicular to each other and each has an organisation like the cart wheel . D. Responsible for trapping light energy for the synthesis of sugar. E. Present in cells actively involved in protein synthesis and secretion. F. Spherical structures rich in hydrolytic enzymes.