University:
Campbell University
Course:
CHEM 430 | Biochemistry
Academic year:

2020
Views:

110

Pages:

3
Author:

esfredint7qo

Terpenes Question 1 The terpene menthone exists as eight stereoisomers. False Question 2 Infrared (IR) spectroscopy is used to identify functional groups in terpenes. True Question 3 One mole of beta carotene is broken down metabolically to give two moles of vitamin A. True Question 4 Which of the following is a bicyclic monoterpene? -pinene Question 5 A triterpene contains three isoprene units. False Question 6 Which vitamin is formed by oxidative metabolism of carotenes? A1 Question 7 Carotenes are examples of terpenes which contravene the isoprene rule. True Question 8 How many stereoisomers would you expect of the following compound? (Hint: draw out the structure showing carbon and hydrogen atoms.) 8 Question 9 Which of the following compounds are precursors or intermediates in the biosynthesis of terpenes and carotenes? Isoprene, acetyl coenzyme A, mevalonic acid, arachidonic acid. Acetyl coenzyme A and melvalonic acid Question 10 One mole of beta carotene is broken down metabolically to give two moles of vitamin A. True Question 11 Which of the following terpene skeletons does not obey the isoprene rule? B Question 12 Which of the following is a cyclic monoterpene occurring in peppermint oil? menthol Question 13 Terpenes are formed from isopentenyl pyrophosphate (IPP) which is itself formed from isoprene and ATP. False Question 14 Essential oils contain chiefly mono- and sesquiterpenes True Question 15 The geometrical (cis-trans) isomers of terpenes show optical rotations which are equal in magnitude but opposite in sign. False Question 16 Which of the following compounds is a pigment in red peppers? capsanthin Question 17 Which terpene is an allelochemical inhibiting the growth of bacteria on the surface of pine trees? -pinene Question 18 Which of the following are recruiting pheromones for honeybees? citral Question 19 A terpene with the molecular formula C15H24 absorbs 3 molecules of hydrogen to form a saturated hydrocarbon, C15H30. How many double bonds and rings are present in the terpene? 3 double bonds, 1 ring Question 20 Grandlure is an aggregation pheromone for ants. False

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