Exploring the World of Monoterpenoids
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Questions and Answers

Which of the following is a characteristic of secondary metabolites?

  • They are found in all living organisms
  • They are produced along offshoots of primary pathways (correct)
  • They are formed through primary metabolism
  • They are essential to primary life processes

Which of the following is a function of secondary metabolites in plants?

  • Attracting insect and bird pollinators to flowers (correct)
  • Reducing competition from other plant species
  • Acting as phytoalexins in plants
  • Repelling predators by smell, taste, toxicity

Which biosynthetic pathway leads to amino acids and aromatics?

  • Polyketide Pathway
  • Shikimic Acid Pathway (correct)
  • Mevalonate (isoprenoid) Pathway
  • Acetate-Malonate Pathway

What is the main difference between primary and secondary metabolism?

<p>Primary metabolism provides chemical building blocks for all important secondary metabolites (C)</p> Signup and view all the answers

Which compound is a major constituent of peppermint oil?

<p>Menthol (D)</p> Signup and view all the answers

Which compound is found in many plants and gives a citrus smell?

<p>Citral (B)</p> Signup and view all the answers

Which compound is a chief constituent of eucalyptus oils and used in antiseptics?

<p>Cineole (C)</p> Signup and view all the answers

Which compound is derived from endo-peroxidation of limonene and used as a laxative and insecticide?

<p>Ascaridole (B)</p> Signup and view all the answers

Which type of enzyme catalyzes redox reactions by transferring electrons from a donor to a receptor?

<p>Oxidoreductases (B)</p> Signup and view all the answers

Which type of enzyme incorporates oxygen into a substrate as oxidation occurs?

<p>Oxygenases (D)</p> Signup and view all the answers

Which type of enzyme transfers groups containing carbon, nitrogen, phosphorus, or sulfur from one substrate to another?

<p>Transferases (C)</p> Signup and view all the answers

Which type of enzyme catalyzes the hydrolysis of CO and CN bonds?

<p>Hydrolases (A)</p> Signup and view all the answers

Which molecule is the primary precursor of IPP and therefore all terpenoids?

<p>Mevalonic acid (C)</p> Signup and view all the answers

Which type of carbon becomes chiral in the biosynthesis of C5 isoprenoids from MVA?

<p>Prochiral carbon (B)</p> Signup and view all the answers

What is the most common pro-ligand in the biosynthesis of MVA?

<p>Hydrogen atoms (A)</p> Signup and view all the answers

What is the main point of regulation in isoprenoid biosynthesis?

<p>HMG-CoA reductase (B)</p> Signup and view all the answers

Which of the following is NOT a natural product used in medicine, agriculture, and industry?

<p>caffeine (C)</p> Signup and view all the answers

Which of the following is a storage product that can be catabolized for energy to produce simpler metabolites?

<p>starch (D)</p> Signup and view all the answers

Which of the following is an example of a compound produced through the isoprenoid pathway?

<p>Rotenone (A)</p> Signup and view all the answers

Which of the following is NOT a compound that can be used as a dye for food and cloth?

<p>White (C)</p> Signup and view all the answers

Which of the following is true about di-phosphatases?

<p>They include DNAses (D)</p> Signup and view all the answers

Which enzyme cleaves α 1→4 bonds of amylose and amylopectin to yield maltose and limit dextrin?

<p>Amylase (D)</p> Signup and view all the answers

Which group of enzymes is responsible for the non-hydrolytic removal of a group, often forming a double bond or addition of a group across?

<p>Lyase (D)</p> Signup and view all the answers

Which type of terpenoid requires 6 isoprene units for its synthesis?

<p>Triterpenoid (A)</p> Signup and view all the answers

Which of the following is true about iridoids?

<p>They have a 5 membered lactone ring fused to a 6 membered lactone ring (B)</p> Signup and view all the answers

What is the function of iridoids in plants?

<p>All of the above (D)</p> Signup and view all the answers

What is the difference between iridoids and secoiridoids?

<p>Iridoids have a cyclopentane ring, while secoiridoids have a second 6 membered lactone ring (B)</p> Signup and view all the answers

What is the function of pyrethrin in plants?

<p>Chemical defense for insects (A)</p> Signup and view all the answers

What is the difference between camphene and other monoterpenes?

<p>Camphene is formed from IPP + DMAPP, while other monoterpenes are formed from Lavandula skeleton (B)</p> Signup and view all the answers

What is the effect of synthetic analogues of pyrethrin?

<p>They are environmentally safe (C)</p> Signup and view all the answers

Which compound is responsible for the taste and smell of ginger?

<p>Zingiberene (C)</p> Signup and view all the answers

Which compound has antimicrobial and insecticidal properties, making it suitable for food preservation and ancient treatments?

<p>Nootkatone (D)</p> Signup and view all the answers

Which compound can act as an anticancer agent due to its cell toxicity?

<p>Taxol (C)</p> Signup and view all the answers

Which compound is derived from Mexican yam and is used in birth control pills?

<p>Diosgenin (B)</p> Signup and view all the answers

Which compound is found in cannabis (marijuana) and has neuro-effects, including cardiac toxicity and treatment?

<p>THC (B)</p> Signup and view all the answers

Which compound is a precursor in the biosynthesis of gibberellins?

<p>Ent-kaurene (D)</p> Signup and view all the answers

Which compound is a major constituent of croton oil and has important use in cancer research?

<p>Beyerene (B)</p> Signup and view all the answers

Which type of terpenoid is made up of 5 isoprene units and is found as linear, mono, bi-, tri-, tetra-, and macro-cyclic compounds?

<p>Sesterterpenoids (A)</p> Signup and view all the answers

Which compound is a precursor to Vitamin E and Vitamin K?

<p>Phytol (D)</p> Signup and view all the answers

Which type of triterpenoid is metabolically stable and usually tetra- or penta-cyclic?

<p>True triterpenoids (C)</p> Signup and view all the answers

Which group of terpenoids is the largest and most diverse?

<p>Mixed/irregular (D)</p> Signup and view all the answers

Which of the following is a property of sesquiterpenoids?

<p>Not very volatile (B)</p> Signup and view all the answers

What is the intermediate synthesis of terpenes and terpenoids?

<p>Farnesyl-PP (FPP) (B)</p> Signup and view all the answers

Which isomer of Farnesyl-PP (FPP) exists as an intermediate synthesis of terpenes and terpenoids?

<p>2-cis,6-trans (D)</p> Signup and view all the answers

What is the starting compound for the majority of sesqui-acyclics?

<p>Farnesol (D)</p> Signup and view all the answers

Which of the following is NOT a function of abscisic acid (ABA)?

<p>Promotion of seed germination (D)</p> Signup and view all the answers

Which of the following is a characteristic of juvenile hormone (JH)?

<p>Maintains larval state (B)</p> Signup and view all the answers

Which of the following is a correct statement about sesquiterpenes?

<p>They have a hydride shift and cyclization (A)</p> Signup and view all the answers

Which of the following is NOT a factor enabling the diversity of terpenoids?

<p>Role in primary metabolism (C)</p> Signup and view all the answers

Which of the following is NOT an economic impact of terpenoids?

<p>Energy production (C)</p> Signup and view all the answers

Which enzyme is responsible for catalyzing the reactions that result in the formation of diterpenoids?

<p>Terpene synthase (A)</p> Signup and view all the answers

What is the main difference between primary and secondary plant metabolism?

<p>Primary metabolism involves the synthesis of essential compounds for growth and development, while secondary metabolism involves the production of compounds that are not essential for growth. (C)</p> Signup and view all the answers

Which of the following is NOT a function of plant terpenes?

<p>Acting as hormones recognized by specific receptors (D)</p> Signup and view all the answers

What is the role of modification reactions in terpene biosynthesis?

<p>To produce multiple different terpenes from one substrate. (B)</p> Signup and view all the answers

What is the main role of plant terpenes in defense against herbivores?

<p>Toxicity (A)</p> Signup and view all the answers

Which compound is a precursor of cholesterol and can form many other compounds such as vitamin D3, steroid hormones, and insect hormones?

<p>Squalene (B)</p> Signup and view all the answers

Which compound is a sterol alkaloid and glycoside found in the green parts of a potato and can cause nausea or paralysis if ingested?

<p>Solanine (A)</p> Signup and view all the answers

Which compound is a cardiac glycoside found in several plant species and is formed from pregnenolone + acetyl CoA?

<p>Cardenolides (C)</p> Signup and view all the answers

Which compound is a C40 terpenoid that is not made in animals, has antioxidant properties, and is an important commercial coloring agent?

<p>Carotenoid (B)</p> Signup and view all the answers

Which group of enzymes is responsible for the diversification of terpene alcohols and oxidized terpenoids by adding acyl, glycosyl, benzoyl, or alkaloid groups?

<p>TPSs &amp; P450s (B)</p> Signup and view all the answers

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