This seems like a long-winded way of saying "I skipped all my labs in undergrad."Sure.
If a professor lectures on something or if a student reads it in a textbook, he or she is most likely going to accept it as probably true, or as the best that's known at present, or something like that. When that student takes an exam, that's the material that will count as a right answer. When the graduate is hired, it's what employers will expect them to know.
When a molecular biology student learns about bioenergetics, glycolysis, electron transport, oxidative phosphorylation, chromosomes and chromatin, or cell membrane structure, where do you think they hear about those things?
Imagine an engineer. If he or she needs to know some physical constant or some details about the properties of some material, that engineer is apt to consult a standard reference like the CRC Handbook. And that engineer is going to have considerable confidence that the information there is correct, to the point of basing his or her own calculations on it.
In a word, we learn from those who came before us. Most of what a person knows, was learned that way.
I'm an engineer. As part of my program, there was quite a bit of emphasis on verifying the constants and equations in the textbooks through experiments and testing.
AFAIK, every accredited engineering program does this. Didn't yours?