Yes.
Malting "wakes up" the grain, which is really just a seed, and makes it start growing. To grow the grain turns on its enzymes and starts making its starches into sugars. Then the maltster kills the grain and roasts it, toasts it into pilsner, pale, munich, black malts, whatever. Unmalted grains have not been "woken up" and not activated their enzymes, therefore they cannot make starches into sugars.
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鯰 a.k.a. なまず a.k.a. Catfish
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