Haemoglobin is a very large molecule by ordinary standards, containing about ten thousand atoms, but the chances are that your haemoglobin and mine are identical, and significantly different from that of a pig or horse. You may be impressed by how much human beings differ from one another, but if you were to look into the fine details of the molecules of which they are constructed, you would be astonished by their similarity.
Interpretation
This quote highlights the molecular similarities among humans, emphasizing our shared biology despite external differences.
Francis Crick points out that while humans perceive themselves as vastly different, at the molecular level, our basic building blocks are remarkably similar. This suggests that the perceived distinctions among individuals are superficial when compared to the shared biological heritage that unites us, drawing a contrast between our external variations and internal similarities.
In practice
In a lecture on human genetics, one might use this quote to illustrate the shared biological foundation of humanity.
One can say, looking at the papers in this symposium, that the elucidation of the genetic code is indeed a great achievement. It is, in a sense, the key to molecular biology because it shows how the great polymer languages, the nucleic acid language and the protein language, are linked together.
Exact knowledge is the enemy of vitalism.
A theory should not attempt to explain all the facts, because some of the facts are wrong
It is essential to understand our brains in some detail if we are to assess correctly our place in this vast and complicated universe we see all around us.
To produce a really good biological theory one must try to see through the clutter produced by evolution to the basic mechanisms lying beneath them, realizing that they are likely to be overlaid by other, secondary mechanisms. What seems to physicists to be a hopelessly complicated process may have been what nature found simplest, because nature could only build on what was already there.
It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material.
Not to leave planet Earth would be like castaways on a desert island not trying to escape...Sending humans to other planets ... will shape the future of the human race in ways we don't yet understand, and may determine whether we have any future at all.
Any scientist who can't explain to an eight-year-old what he is doing is a charlatan.
The laws of physics ... seem to be the product of exceedingly ingenious design... The universe must have a purpose.
I simply go with what works. And what works is the healthy skepticism embodied in the scientific method. Believe me, if the Bible had ever been shown to be a rich source of scientific answers and enlightenment, we would be mining it daily for cosmic discovery.
The DNA-encoded catalytic machinery of the cell can rapidly learn to promote new chemical reactions when we provide new reagents and the appropriate incentive in the form of artificial selection.
The works of Lavoisier and his associates operated upon many of us at that time like the Sun's rising after a night of moonshine: but Chemistry is now betrothed to the Mathematics, and is in consequence grown somewhat shy of her former admirers.
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