I suppose the simplest answer is the most recent version of that author's textbook. To give a more involved answer, I'd like a better explanation of the premise:
The professor consistently says the chemical mechanisms shown in the textbook are no longer accepted or incorrect
Umm ... huh? The standard biochemical reactions, such as glycolosis, the Kreb's cycle, and the like? Those have been well defined and verified for decades. I'm pretty sure my Zubay textbook, back in 1994, explicitly said the pathways were done, and modern work is focused more on determining triggers for various side reactions, as a way of better understanding metabolism.
Then again, 18th century scientists in Britain lamented that, with Newton's work, everything was known, and nothing was left to learn. They were wrong, so maybe there needs to be a real paradigm shift in our knowledge of biochemistry. I'd still like a specific example, 'tho.