Learn / Metabolism
Metabolic pathways
Every FMK pathway as a clickable map. Pick one pathway to hammer it — next step, enzyme, regulator, cofactor, and the facts that get tested (NADPH and who needs it, rate-limiting steps, deficiencies) — or set it to all pathways for a mixed drill. Every answer says which enzyme and which pathway.
Cholesterol synthesis · Cytosol / smooth ER — mainly liver. Enzymes sit beside the arrows; a ★ marks the rate-limiting step. The map scrolls inside its panel.
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Cholesterol synthesis
Steroid hormones
Made from Cholesterol (C27) by Desmolase / CYP450 side-chain cleavage (adrenal, gonads)
Desmolase / CYP450 side-chain cleavage (adrenal, gonads) — Cholesterol synthesis
Cofactors: NADPH
Pregnenolone → all steroid hormones.
Condition cards:Congenital adrenal hyperplasia (21α-hydroxylase deficiency) →