Which of the following statement about regulation of gene expression is correct?

a. An inducible gene is transcribed when a specific substance is absent.
b. A gene is any DNA sequence that is transcribed into an mRNA molecule only.
c. All genes are transcribed at all times as long as they have a functional promoter.
d. The regulation of gene expression is the same in both eukaryotes and prokaryotes.
e. The regulation of gene expression is critical for the control of life processes in all organisms.



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