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| 1 | |
Which statement about Acetyl Coenzyme A is false? |
| | A) | Acetyl CoA is a thioester. |
| | B) | The thioester is more reactive than ordinary esters. |
| | C) | There is a smaller enol concentration at equilibrium. |
| | D) | The acetyl CoA is reactive to nucleophilic attack at the carbonyl carbon. |
| | E) | The acetyl CoA is reactive at the a-carbon. |
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| 2 | |
Which statement about triglycerides is false? |
| | A) | Triglycerides are triethers. |
| | B) | Triglycerides are made, in part, from 1,2,3-propanetriol. |
| | C) | Triglycerides are also made from fatty acids. |
| | D) | Both fats and oils are triglycerides. |
| | E) | Most of the fatty acids contain an even number of C atoms, and are unbranched, but may contain cis-double bonds. |
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| 3 | |
Which statement about fatty acid synthesis is false? |
| | A) | Synthesis requires the use of acetyl CoA. |
| | B) | Synthesis involves successive oxidation of the acetyl group. |
| | C) | Synthesis involves successive reduction of the acetyl group. |
| | D) | Synthesis involves an a,b unsaturated intermediate. |
| | E) | None of the above. |
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| 4 | |
Which statement about phospholipids is false? |
| | A) | Phospholipids are also known as phosphoglycerides or glycerol phosphatides. |
| | B) | Many phospholipids are diesters of phosphoric acid. |
| | C) | Phosphatidylcholine contains a -CH2CH2N+(CH3)3 ester. |
| | D) | Phospholipids are the only component of a lipid bilayer. |
| | E) | The phospholipids provide a structural role in the lipid bilayer. |
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| 5 | |
Which statement about waxes is false? |
| | A) | Waxes are ethers. |
| | B) | Waxes are solid fatty acid derivatives. |
| | C) | Waxes normally contain a large number of carbon atoms. |
| | D) | Both the alkyl and acyl groups are normally unbranch |
| | E) | Along with fats, oils, and phospholipids, waxes are derived from fatty acids. |
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| 6 | |
The following molecule is the carbon skeleton of a?
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| | A) | Fatty acid. |
| | B) | Triglyceride. |
| | C) | Wax. |
| | D) | Phospholipid. |
| | E) | Prostaglandin. |
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| 7 | |
Which statement about prostaglandins is false? |
| | A) | Prostaglandins are related to icosanic acid: CH3(CH2)18CO2H. |
| | B) | Other icosanoids include thromboxanes, prostacyclins, and leukotrienes. |
| | C) | Prostaglandins are derived from linoleic acid, an essential fatty acid. |
| | D) | The subscript number in the name of a prostaglandin indicates the number of hydroxyl groups. |
| | E) | Many prostaglandins exert their effects on smooth muscle. |
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| 8 | |
Prostaglandins contain a number of chiral centers whose stereochemistry is controlled by the enzyme that acts on the substrate. |
| | A) | True. |
| | B) | False. |
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| 9 | |
Which statement about terpenes is false? |
| | A) | Terpenes are essential oils. |
| | B) | Terpenes are composed of iosprene (2-methyl-1,3-butadiene) fragments. |
| | C) | The fragments are usually joined head-to-head. |
| | D) | Terpenes are also known as isoprenoids. |
| | E) | Terpenes can also contain cyclic structures. |
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| 10 | |
Which statement about the biological synthesis of terpenes is false? |
| | A) | Isobutenyl phosphate is the biological isoprene unit. |
| | B) | The reaction uses the p electrons as a nucleophile to form a new carbon-carbon bond. |
| | C) | The phosphate group acts as a leaving group. |
| | D) | The tertiary carbocation intermediate losses an adjacent H+ to form a double bond. |
| | E) | The last remaining phosphate group is converted to an alcohol by hydrolysis. |
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| 11 | |
The following molecule is the carbon skeleton of a?
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| | A) | Fatty acid. |
| | B) | A steroid. |
| | C) | Wax. |
| | D) | Phospholipid. |
| | E) | Prostaglandin. |
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| 12 | |
Biological precursors to steroids include all of the following except? |
| | A) | Acetyl CoA. |
| | B) | squalene (a terpene). |
| | C) | Cholesterol. |
| | D) | Terpene esters. |
| | E) | Lanosterol. |
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| 13 | |
Cholesterol is a precursor to all of the following except? |
| | A) | Vitamin D. |
| | B) | Carotenoids. |
| | C) | Bile acids. |
| | D) | Testosterone. |
| | E) | Estrogen. |
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| 14 | |
Anabolic and catabolic processes are? |
| | A) | Anabolic processes are degradative and breakdown large molecules into fragments, while catabolic process build larger molecules from smaller ones. |
| | B) | Catabolic processes are degradative and breakdown large molecules into fragments, while anabolic process build larger molecules from smaller ones. |
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