lac-operon વિશે કયું વિધાન સાચું છે?

Question

Match the following genes of the lac operon listed in column ‘A’ with their respective products listed in column ‘B’:
\[ \begin{array}{|c|c|} \hline \textbf{A: Gene} & \textbf{B: Products} \\ \hline \text{a. ‘i’ gene} & \text{(i) β-galactosidase} \\ \text{b. ‘z’ gene} & \text{(ii) lac permease} \\ \text{c. ‘a’ gene} & \text{(iii) repressor} \\ \text{d. ‘y’ gene} & \text{(iv) transacetylase} \\ \hline \end{array} \] Select the correct option:

Answer 1

Step 1: lac-operon ની રચના.
lac-operon માં E. coli ના lactose metabolism genes (z, y, a) હોય છે. Regulator gene 'i' repressor protein ઉતપન્ન કરે છે.
Step 2: Gene i સતત અભિવ્યક્ત થાય છે.
Gene i એ constitutive gene છે - તે પોતાના અલગ promoter થી સતત (always) expressed થાય છે. Inducer = lactose (allolactose), galactose નહીં. Lactose repressor ને inactivate કરે છે (કામ કરતો અતકાવે છે), activate નહીં.
Step 3: સાચો ઉત્તર.
\[ \boxed{\text{Gene i સતત અભિવ્યક્ત (constitutively expressed) થાય છે}} \]

List I		List II
A	Two or more alternative forms of a gene	I	Back cross
B	Cross of F₁progeny with homozygous recessive parent	II	Ploidy
C	Cross of F progeny with any of the parents	III	Allele
D	Number of chromosome sets in plant	IV	Test cross

lac-operon વિશે કયું વિધાન સાચું છે?

Show Hint

The Correct Option is B

Solution and Explanation

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