Search found 4 matches

by joneall
Sun Apr 01, 2018 3:59 pm
Forum: Evolution
Topic: Natural selection ends in absurdity or nonsense
Replies: 27
Views: 46915

Re: Natural selection ends in absurdity or nonsense

I'd just like to point out that whereas mutation works on genes, NS works on phenotypes. A phenotype in general corresponds to a whole slew of genes. (Think skin color.) A given phenotype may therefore be selected because of its survival value in one environment, ignoring its dangers in others. Thin...
by joneall
Sun Apr 01, 2018 3:44 pm
Forum: Cell Biology
Topic: Chemiosmosis complex in sets?
Replies: 0
Views: 1043

Chemiosmosis complex in sets?

You always see nice diagrams of the four chemiosmosis complexes in, say, the inner membrane of a mitochondrion, all lined up in order (and in a straight line), each one eagerly awaiting the output from the previous one. Does it really happen this way? Does the ubiquinone from a given complex 1 carry...
by joneall
Sun Jul 24, 2016 1:30 pm
Forum: Cell Biology
Topic: Does chemiosmosis pump protons or hydronium ions?
Replies: 3
Views: 3011

Does chemiosmosis pump protons or hydronium ions?

In the process of chemiosmosis (or the electron transport chain), I always read that the process pumps protons across a membrane -- either the inner membrane of the mitochondria or the thylakoid membrane of chloroplasts. I wonder about this. I suspect that what is really pumped are hydronium ions, H...
by joneall
Wed May 04, 2016 2:24 pm
Forum: Genetics
Topic: genetic witches in evo devo
Replies: 1
Views: 1997

genetic witches in evo devo

I am reading Sean Carroll's "Endless forms most beautiful" and trying to understand genetic switches. I have trouble seeing the big picture -- how to put it all together. I will explain my current perception of the process in the hope you can either correct my errors or add the pieces I am...