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I'd recommend "Biology: The Science of Life" by Robert A. Wallace, if you can find it. It's just a general biology textbook, but well written and a good introduction.
After that, I have no idea. I used this one:
It will be rough going no matter what. You basically have to memorize an alphabet soup of enzymes and ligands. Worse, everything is unintuitively named because it was discovered by accident or for some reason unrelated to its function. For example, the enzyme "XP" is named after the disease it causes, Xeroderma Pigmentosa, rather than its function (DNA repair).
t. used to work in the immunology department at MIT.