Which compounds are not secondary plant metabolites?

Name: Which compounds are not secondary plant metabolites?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Secondary plant metabolites are often involved in defense against herbivores and pathogens. Phenolics, alkaloids, terpenes, and glucosinolates are all examples of secondary plant metabolites. PR (pathogenesis-related) proteins, however, are not secondary metabolites. They are proteins that are produced in response to pathogen attack and play a role in the plant's defense response.

Which Compounds Are Not Secondary Plant Metabolites