_biology
which molecules in eukaryotic cells regulate gene expression?
a. recombinant dna
b. plasmids
c. transcription factors
d. lactose

C (Transcription factors)

Explanation:

Gene regulation refers to the mechanisms that act to induce or repress the expression of a gene. These include structural and chemical changes to the genetic material, binding of proteins to specific DNA elements to regulate transcription. Gene regulation controls the rate and manner of gene expression.

Transcription factors are proteins that play an important role in regulating the transcription of genes by binding to specific regulatory nucleotide sequences. They help turn specific genes "on or off" by binding to nearby DNA. Transcription makes it easy or hard for RNA polymerase (an enzyme that synthesizes a RNA molecule from DNA template) to bind to the promoter of a gene.

Transcription factors that boost gene expression are called ACTIVATORS while those that decrease it are called REPRESSORS.

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