You have two bottles, each of which contains a white, crystalline substance. Your lab director tells you that one contains lactose and the other sucrose. Your job is to determine which bottle contains which sugar. Which procedure would you use? A. Test for the ability to reduce Cu2+. Only lactose will react. B. Test both for solubility in water. Sucrose is very soluble; lactose is only minimally soluble. C. React each with bromine (Br2) water. Only sucrose will react. D. Dissolve each in water and record the pH. Lactose is far more acidic than sucrose.
You have two bottles, each of which contains a white, crystalline substance. Your lab director tells you that one contains lactose and the other sucrose. Your job is to determine which bottle contains which sugar. Which procedure would you use?
| A. |
Test for the ability to reduce Cu2+. Only lactose will react. |
|
| B. |
Test both for solubility in water. Sucrose is very soluble; lactose is only minimally soluble. |
|
| C. |
React each with bromine (Br2) water. Only sucrose will react. |
|
| D. |
Dissolve each in water and record the pH. Lactose is far more acidic than sucrose. |
Termites and cows have bacteria in their digestive tracts that can obtain glucose from plant cellulose because they have enzymes that can attack
| A. |
α-D-glucoside. |
|
| B. |
β-D-glucoside. |
|
| C. |
cellulose branch points.
|
|
| D. |
hydrogen bonds in cellulose fibrils. |
The chemical name for table sugar is ________ and it is a ________.
| A. |
lactose; disaccharide
|
|
| B. |
sucrose; monosaccharide |
|
| C. |
lactose; monosaccharide |
|
| D. |
sucrose; disaccharide |
Pyranose rings are usually most stable when the ring adopts a ________ conformation with the bulkiest ring substituents in ________ positions.
| A. |
boat; axial
|
|
| B. |
boat; equatorial |
|
| C. |
chair; equatorial |
|
| D. |
chair; axial |
Which is true about naturally occurring monosaccharides?
| A. |
The L and D-isomers occur in equal ratios.
|
|
| B. |
The D-isomers predominate. |
|
| C. |
The ratio of L and D-isomers varies widely depending on the source. |
|
| D. |
The L-isomers predominate. |
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