NURSING EXAM QUESTIONS
PHARMACOGNOSY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Primary meabolits
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Seconday metabolits
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All the above
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None of the above
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Detailed explanation-1: -Alkaloids are secondary metabolites originally defined as pharmacologically active compounds, primarily composed of nitrogen (Croteau et al., 2000; Ziegler & Facchini, 2008). They are synthesized from one of the few common amino acids: lysine, tyrosine and tryptophan.
Detailed explanation-2: -Toxins, gibberellins, alkaloids, antibiotics, and biopolymers are examples of secondary metabolites.
Detailed explanation-3: -Plant secondary metabolites are classified by their chemical structure and can be divided into four major classes: terpenes, phenylpropanoids (i.e. phenolics), polyketides, and alkaloids.
Detailed explanation-4: -There are five main classes of secondary metabolites such as terpenoids and steroids, fatty acid-derived substances and polyketides, alkaloids, nonribosomal polypeptides, and enzyme cofactors [6].