Pharmacognosy Lecture 6117: Plant Chemistry - Glycosides and Tannins Part 1

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30 Questions

What is the enzyme responsible for producing 3-deoxy-D-arabinoheptulosonate-7-phosphate?

DAHP Synthase

Which molecule is a product of the Shikimic Acid pathway besides Shikimic Acid?

Gallic Acid

What is the enzyme responsible for the phosphorylation of the 3rd hydroxyl group?

Shikimate Kinase

Which compound is NOT a product of the Shikimic Acid pathway?

Xanthones

What can Step 4 with Dehydroshikimic Acid in the Shikimic Acid Pathway render besides Shikimic Acid?

Gallic Acid

Which compound belongs to Hydrolysable Tannins produced in the Shikimic Acid pathway?

Gallo Tanin

What is the family of the Salix fragilis plant?

Salicaceae

Which compound can be obtained from the hydrolysis of salicin?

Salicyl alcohol

What is the primary use of salicyl alcohol?

As a starting material for the synthesis of aspirin

Who isolated salicin from the tannins of willow trees?

Johann Büchner

What is the common name of Populus tremuloides?

Poplar

What is the main constituent of Poplar that is similar to salicin?

Populin

Which of the following is the correct precursor molecule for triterpenes?

Farnesyl Pyrophosphate (C15PP)

What is the primary difference between lignin and lignan?

Lignin is a polymer, while lignan is a smaller, biologically active molecule

What is the role of squalene in the biosynthesis of natural compounds?

Squalene is the precursor for the synthesis of steroids and glycosides

What is the function of phytol in plants?

Phytol is a precursor for the synthesis of gibberellins, plant growth hormones

What is the role of carotenoids in plants?

Carotenoids are pigments that can act as both oxidants and antioxidants in plants

What is the significance of the C20PP intermediate in the biosynthesis of natural compounds?

C20PP is the precursor for the synthesis of geranyl pyrophosphate and farnesyl pyrophosphate

What is the most common type of glycosidic bond found in glycosides?

R-O-R' (O-glycosides)

Which form of glycosides is found in plants?

β-glycosides

Which enzyme specifically targets the β forms of glycosides for hydrolysis?

Both myrosin and emulsin

Which family of plants does the enzyme myrosin come from?

Brassicaceae (cabbage family)

What is the aglycone portion of the glycoside amygdalin?

Benzaldehyde and cyanide (HCN)

Which of the following pathways is involved in the formation of glycosides with aromatic amino acids?

Shikimic acid pathway

What is the primary function of the glycone portion in a glycoside?

To increase the solubility of the glycoside

Which of the following is NOT a possible aglycone component in a glycoside?

Alkaloid

Which of the following statements about glycosides is true?

The aglycone portion of a glycoside is responsible for its bioactivity

What is the term used to refer to the aglycone portion of a glycoside when it is a terpene or terpenoid?

Genin

Which of the following pathways is involved in the biosynthesis of glycosides?

All of the above

Which of the following statements about glycosides is FALSE?

Glycosides are always bioactive compounds

This quiz covers the introduction and biosynthesis of glycosides and tannins in plants, including structures, pathways, lignans, cutin, suberin, and a summary. It also includes anthraquinone glycosides related to the Shikimic Acid Pathway.

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