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| Science Forum Index » Bio Evolution Forum » Why Catabolic Anabolic Pathways Kept Separate... |
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| Tom Hendricks... |
 Posted: Tue Aug 18, 2009 7:34 am |
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Natural selection evolved in two pathways - catabolic biochemistry or
anabolic biochemistry. Life is either better catabolic processes,
anabolic processes, or the regulation of them.
The question is why have they been kept so relatively separate after 4
billion years of evolution; what evolutionary advantages are there to
these two being kept apart.
The catabolic and anabolic divisions have to be kept relatively
separate so that each can be monitored and regulated separately. That
gives much greater flexibility, plasticity, and evolutionary
advantage, than if both were monitored together as one system. And it
allows for quicker reaction to stress in the environment.
They also have been kept separate because that has led to a 'symbiotic
arms race' where each side's changes spur the other to match or exceed
them. Thus we have two evolutionary lines going at once - and each
challenges the other to improve its processes.
Had life been a single chemical process it would not have had these
abilities to adjust to the environment.
That's why the divisions are relatively separate after 4 billion years
of evolution. |
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| Darwin123... |
| Posted: Wed Sep 30, 2009 7:11 pm |
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On Aug 18, 1:34=A0pm, Tom Hendricks <tom-hendri... at (no spam) att.net> wrote:
[quote:5e85667102]Natural selection evolved in two pathways - catabolic biochemistry or
anabolic biochemistry. Life is either better catabolic processes,
anabolic processes, or the regulation of them.
The question is why have they been kept so relatively separate after 4
billion years of evolution; what evolutionary advantages are there to
these two being kept apart.
I think the answer is that they have not been kept apart. Although[/quote:5e85667102]
opposite in definition, each cell simultaneously performs both types
of reaction simultaneously. You have not provided evidence that they
are kept separate.
The organism has no need to separate the two processes in time. As
an example, consider respiration in any eukaryotic cell. Respiration
is basically a catabolic process, where a big molecule is broken up
into small molecules. This is performed in the mitochondria. However,
the ribosomes build proteins from amino acids. This is an anabolic
process.
The two processes are separate spatially by a small distance.
Obviously, the organism can not survive if the protein molecules are
broken down as soon as they are put together. However, there is no
separation in time. In fact, the cell would probably die if the
respiration had to be halted to make a protein. There is separation in
space, not time. Why should a higher organism need to separate the two
processes in time? Better yet, why do you think the two processes are
separated in time.
Your hypothesis is that catabolic and anabolic reactions are
separated in time by the phases of sleep and wakefulness. However, you
haven't provided even one piece of evidence that they are separated
that way.
Basically, you stated your hypothesis as though it is a well known
fact. |
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| Tom Hendricks... |
| Posted: Sun Oct 04, 2009 8:06 am |
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On Oct 1, 12:11=A0am, Darwin123 <drosen0... at (no spam) yahoo.com> wrote:
[quote:4d4763f746]On Aug 18, 1:34=3DA0pm, Tom Hendricks <tom-hendri... at (no spam) att.net> wrote:> Nat=
ural selection evolved in two pathways - catabolic biochemistry or
anabolic biochemistry. Life is either better catabolic processes,
anabolic processes, or the regulation of them.
The question is why have they been kept so relatively separate after 4
billion years of evolution; what evolutionary advantages are there to
these two being kept apart.
=A0 =A0 I think the answer is that they have not been kept apart. Althoug=
h
opposite in definition, each cell simultaneously performs both types
of reaction simultaneously. You have not provided evidence that they
are kept separate.
=A0 =A0 The organism has no need to separate the two processes in time. A=
s
an example, consider respiration in any eukaryotic cell. Respiration
is basically a catabolic process, where a big molecule is broken up
into small molecules. This is performed in the mitochondria. However,
the ribosomes build proteins from amino acids. This is an anabolic
process.
=A0 =A0 The two processes are separate spatially by a small distance.
Obviously, the organism can not survive if the protein molecules are
broken down as soon as they are put together. However, there is no
separation in time. In fact, the cell would probably die if the
respiration had to be halted to make a protein. There is separation in
space, not time. Why should a higher organism need to separate the two
processes in time? Better yet, why do you think the two processes are
separated in time.
=A0 =A0 Your hypothesis is that catabolic and anabolic reactions are
separated in time by the phases of sleep and wakefulness. However, you
haven't provided even one piece of evidence that they are separated
that way.
=A0 =A0 Basically, you stated your hypothesis as though it is a well know=
n
fact.
[/quote:4d4763f746]
You brought up mitochondria. Note that it is catabolic, digestion and
separate.
See my new post on that. Catabolic and anabolic being eparate does not
mean they don't work
at the same time. That was never said or implied. |
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