Which enzyme is the expression product of the $y$ gene in the $lac$-operon?

  • A
    Beta-galactosidase
  • B
    Permease
  • C
    Transacetylase
  • D
    Lactase

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The end product of a metabolic pathway binds to the operator to make it more active,so that it can easily bind with the repressor. In this case,the end product is called a/an ......

$A$ model that relates repetitive $DNA$ sequences and their transcripts of regulation in eukaryotes was proposed by

In eukaryotes,the regulation of gene expression could be exerted at $:-$
$(I)$ Transcriptional level (formation of primary transcript)
$(II)$ Processing level (regulation of splicing)
$(III)$ Transport of $\text{mRNA}$ from nucleus to the cytoplasm
$(IV)$ Translational level
Choose the correct order for given statements $:-$

Few genes are found in all types of cells of differentiated multicellular organisms of higher classes. These are called:

In $lac$ operon,$z$ gene codes for:

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