those situations. That has been looking at
all of the mechanisms of possibility for control
and transcription that we're aware of and in
prokaryotic cells, of course, there are probably
many more things that come into play. That
covers here. We have other levels we could
modulate transcription from. Keep in mind
that ribosomes jump right onto that messenger
RNA as it is being transcribed and the more
ribosomes that are produced by other genes
elsewhere, the more ribosomes jump on the
strand and transcribe that DNA and we have
that little Christmas tree looking thing and
we have a high rate of production of proteins.
All sorts of regulatory mechanisms come into
play and putting together the subunits of
the ribosome and all of the tRNAs and so on
and so forth that are necessary to have
successful translation of the messenger RNA.
Finally, we could alter the protein structure.
We have the protein produced and it is in
an active form and it needs to be activated
or inactivated according to whether that protein
is necessary. Three levels of potential regulation
for prokaryotic cells, of course, eukaryotes,
we have many more levels of possible regulation
and we will explore that in the next lecture
at least what we know about it.
Now at this point, you should be able to recognize
the most common DNA binding motifs as well
as explain how the inducible operon functions
and explain how the repressible operon functions.
Thank you so much for your attention. I will
look forward to seeing you in our discussion
of eukaryotic gene regulation.