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Tuesday, February 28, 2012

Clams' Insane Molecular Diversity

When I tell people I am a chemist the most common response is, “Oh man, I hated that in school, especially organic chemistry!” That's an unfortunate but reasonable response. Trying to understand these tiny things called molecules that are impossible to see can be kind of like learning about a never-to-be-seen dimension in which up is down and left is orange.

Thinking about chemicals can be very disorienting. Image via Andrew Lipson.

I love chemistry though because the shapes of these molecules scribbled on the chalk board actually have consequences that we can see in the world. The changing color of leaves on the approach of winter is caused by actual changes in the structure of the matter of which those leaves are made.  The effects of the diversity of molecular shapes in the world around us can actually be SEEN with our eyes!

Green and yellow leaves on the Katsura tree with the chemicals responsible for those colors (chlorophyll a and yellow-chlorophyll-catabolite, respectively). Image and knowledge via Krautler et. al.

When someone tells me they are a biologist my most common response is, “Oh man, biology is so complicated!” It seems so daunting to me to move beyond a simplistic description of aspects of life such as "chemical X results in color Y" and actually try to understand the nearly unfathomable diversity of chemicals that come together to make each living thing unique.

Not to scale. Clams are way bigger than DNA, which is way bigger than water.

I am certainly not capable of crafting a simple yet complete description of how the shapes of the molecules that make up living things contributes to those things' visible shapes, sizes, and colors.

Fortunately, where my scientific brain fails, an artistic brain succeeds. Video artist and experimental animator David C. Montgomery has created a beautiful video capturing the diversity of shapes, patterns, and colors that are present within several different species of life. When watching this video (full screen it!!), try and think about how all of the differences you see are caused by differences in the shape, arrangement, and composition of the unimaginably tiny and diverse molecules of which the living things are composed.


LIFE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

2 comments:

  1. whoaaaaa, whoa, whoa, whoa. does greater molecular diversity create stronger and more fertile organisms? (i almost typed orgasm) I forgot everything from AP Bio. THXXX

    --Maria

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    1. That is a super huge question. I will preface my answer by saying that I am not a biologist, or ecologist, or any other type of specialist that might be remotely equipped to answer your question. So, here goes. I don't think it is accurate to say that greater molecular diversity creates stronger and more fertile organisms. Life is just too complex. You could say that bacteria, being super tiny, have less molecular diversity than humans, being super huge and even playing host to an insane variety of microbes in our bodies. However, to say that because of that we are "stronger" or "more fertile" would I think be an oversimplification. We are both just suited to very different environments and roles in those environments. That's why I shy away from biology generally, because I love to make generalizations and extremely simple statements, but the molecular details of life seem too complex for that kind of thing. Sorry for that long-winded and probably unsatisfying answer! :-)

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