Open the manual. Do not read the answer. Read only the first sentence or the first sub-step. Does that unstick you? If yes, close the manual and try again.
For the serious student: The manual is not a crutch; it is a tutor that works 24/7. It teaches you how biochemists think : moving from known data to unknown conclusions, step by molecular step. solutions manual for lehninger principles of biochemistry
However, if you are a non-major taking a single "Intro to Bioenergetics" course that skips most of the metabolism chapters, you may not need it. Open the manual
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