Dapi pointed out that I didn't answer what I meant by "know the company". Quite right...
Umm.... know them!
Know the Press Releases they have put out so that you know what is going on to them as a business.
Know their technology/products so that you can speak to the technology.
Know the workflow that would be around their products. By this I mean know WHY people would use the product, WHAT questions the people are asking when they use the product, and what the next step in the experiments is that you do when you are asking those questions.
An example workflow might be.
Microarray -> Informatics -> QPCR -> Western
with the idea being that you find some genes your interested in, confirm them with QPCR, and then move to western blots to look at what the protein did. Simple workflow, and not totally complete, but I hope you get the idea. For whatever it is that you are interviewing on (and I have to admit to trying to guess based on where you are flying to, but you should NOT post the answer) you should be able to write/say some sort of workflow like this. Coupled to that, you should be able to talk a bit about how problems in 1 step can affect other steps etc...
Basically show that you know what a scientist would be doing with whatever it is that you are selling.
You can't know everything about the company, so don't try. You do, however, need to show that you bothered to look up as much as you could. Google the people you will be interviewing with. Google the company and read anything you find.
Knowledge is your friend in this case, and anything helps. Showing that you put in effort is what you want the outcome to be. Don't brag about it, just do it and trot the information out when it is needed.
I would NOT be too worried about being able to comment on something about every executive. I would, however, know their names and roles. i.e. Know who the CEO is, who the CFO is etc... You don't need to memorize where they went to grad school or what degrees they have, but you should know their names. I would spend more time making sure I had the tech under control than I would on this, but you need to know the names.