Practice question
Question
Alkaloids are:
Explanation
The right choice is C: Nitrogen-containing compounds. In PLANT SEC METABOLITES, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Nitrogen-free; B) Carbohydrates; D) Lipids. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.