Definitions/Explanation : Splicing & Operator gene
 

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$(1)$ The primary transcripts contain both the exons and introns and are non-functional. Hence it is subjected to a process called splicing where introns are removed and exons are joined in a defined order.

$(2)$ It gives passage to $RNA$ polymerase moving from promotor to structural gene i.e. it control. activity of structural gene.

Similar Questions

Select the two correct statements out of the four $(i-iv)$ given below about lac operon.

$i.$ Glucose or galactose may bind with the repressor and inactivate it.

$ii.$ In the absence of lactose, the repressor binds with the operator region.

$iii.$ The z-gene codes for permease.

$iv.$ This was elucidated by Francois Jacob and Jacque Monod.

Genes that are involved in turning on or off the transcription of a set of structural genes are called

  • [AIPMT 1998]

In Operon concept, the regulator gene regulates chemical reactions in the cell by

  • [AIIMS 1985]

$A$ : Single $DNA$ dependent $RNA$ polymerase catalyses transcription of all types of $RNA$ in all except bacteria.
$R$ : Structural genes in bacteria are monocistronic.

Match List $-I$ with List $-II$ :

List $-I$ List $-II$
$a$ In lac operon $i$ gene codes for $i$ transacetylase
$b$ In lac operon $z$ gene codes for $ii$ permease
$c$ In lac operon $y$ gene codes for $iii$ $\beta$ - galactosidase
$d$ In lac operon $a$ gene codes for $iv$ Repressor

Choose the correct answer from the options given below :

  • [NEET 2022]