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1 | |
Compare b-D-ribose with b-D-2-deoxyribose. How many chiral carbons are there in these latter two sugars(ribose first). |
| | A) | 2,1 |
| | B) | 3,2 |
| | C) | 3,3 |
| | D) | 4,3 |
| | E) | 4,4 |
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2 | |
Nature commonly uses N-acetyl glucosamine to produce polymers for many situations. However, polymers of glucosamine are essentially only produced synthetically. Can you propose a possible reason for a lack of poly-glucosamine in nature? |
| | A) | There is no good reason. |
| | B) | It would be hydrolyzed by peptidases. |
| | C) | There would be many positive charges that would require counter ions. |
| | D) | It can't be distinguished from starches. |
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3 | |
Notice that glucose and several other sugars shown in the text exist in a,b, and open chain forms. How many forms would you predict to be needed to represent sucrose? |
| | A) | 6 |
| | B) | 4 |
| | C) | 3 |
| | D) | 2 |
| | E) | 1 |
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4 | |
How does penicillin kill bacteria? |
| | A) | It is an enzyme that hydrolyzes cell walls |
| | B) | It prevents the formation of cross links in peptidoglycans |
| | C) | It starves cells for glucose |
| | D) | It prevents nutrients from entering bacteria |
| | E) | C and D |
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5 | |
How many chiral carbons are there in the open chain form of a tetroketose? |
| | A) | 1 |
| | B) | 2 |
| | C) | 3 |
| | D) | 4 |
| | E) | 5 |
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6 | |
Is the hemiacetal form of glucose a reducing sugar? |
| | A) | No, because there must be an aldehyde group in the sugar. |
| | B) | Only the open chain form of glucose is reducing. |
| | C) | Only ketoses are reducing. |
| | D) | Yes, because hemiacetals are in equilibrium with aldehydes. |
| | E) | No, because it still contains calories. |
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7 | |
The linkage between the monosaccharides in lactose is a(n): |
| | A) | An acetal |
| | B) | A hemiacetal |
| | C) | A ketal |
| | D) | A hemiketal |
| | E) | None of these |
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8 | |
The linkage between the glucose units in amylopectin is a(n): |
| | A) | An acetal |
| | B) | A hemiacetal |
| | C) | A ketal |
| | D) | A hemiketal |
| | E) | None of these |
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9 | |
What is the difference between glucose and galactose? |
| | A) | The geometry on carbon 1 |
| | B) | The geometry on carbon 2 |
| | C) | The geometry on carbon 3 |
| | D) | The geometry on carbon 4 |
| | E) | The geometry on carbon 5 |
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