Answer:
(d) Regulatory sequences (proteins)
control the functions of structural genes and are at called regulatory genes.
The important regulatory genes are promoters, terminators, operators and
repressor.
To regulate the process of
transcription, transcription factors (a sequence of specific
DNA-binding factor) alone or
with other proteins, promoter (as on activator) or stop as are press or the
binding site of RNA polymerase to DNA.
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