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Hi, I would argue, in this case, in favor of
the students. They’ve shown that you may need to re-write your question
to be more specific. You can state, in the question, that you’re looking
for a negative-feedback example in the control systems (which would exclude
intracellular pathways). I’ve been caught by students on occasion who
read a question differently than I but could justify their answer afterwards.
It’s hard to get mad at students who make me learn. Tom From: HAPS-L-owner@xxxxxxxxxxx [mailto:HAPS-L-owner@xxxxxxxxxxx] On Behalf Of Weck, Margaret But isn’t this at a lower level of
organization than the systems we usually refer to as “control
systems”? I would say end-product inhibition is negative feedback,
but it isn’t an example of a “control system” because it is
happening at the molecular rather than cellular level. What do others think? Margaret W. From: HAPS-L-owner@xxxxxxxxxxx [mailto:HAPS-L-owner@xxxxxxxxxxx] On Behalf Of James S. Miller Biochemistry is full of metabolic pathways where the
end product, or even sometimes intermediates, inhibits the first or second
enzyme in the pathway. This was always considered to be negative feedback
in every text I've ever seen. So, if I understand you correctly, the
answer is yes. It's a negative feedback homeostatic mechanism. On
a recent essay exam I asked my students to give me an example of negative
feedback. Most used |