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Exam 23: Carbohydrates and Nucleic Acids

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Question 31

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Draw the cyclic hemiacetal form of D-glucose both as a chair conformation and as a Haworth projection.

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Question 32

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Treatment of a monosaccharide with silver oxide and excess methyl iodide will ________.

A) methylate all hydroxyl groups present
B) cleave the sugar between C5 and C6
C) cleave the sugar between C1 and C6
D) methylate only the hydroxyl at C1
E) form the disaccharide

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Question 33

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Draw the Fischer projection of the open chain form of D-arabinose.

Provide the structure of guanosine.

In the Fischer projection of D-(+) -glyceraldehyde, the hydroxyl group on the asymmetric carbon center is ________.

_{Which of the following would give a positive Tollen's test?}

Draw the Haworth structure of α-D-ribofuranose.

Which structure is deoxycytidine monophosphate?

What two D-aldohexoses result when D-arabinose is subjected to the Kiliani-Fischer synthesis?

Draw the Fischer projection for the open-chain form of D-erythrose.

Under what conditions is the methyl glycoside of galactose hydrolyzed?

Draw the Fischer projection for the open-chain form of D-glucose.

Draw the Haworth structure of ethyl β-D-galactopyranoside.

Draw the Haworth structure of the β-furanose form of the monosaccharide shown below.

Draw the Fischer projection of (2S,3R)-2,3-dihydroxybutanoic acid, and label it as erythro or threo.

How many asymmetric centers are present in the open chain form of the aldohexose D-(-) -gulose?

All naturally occurring sugars can be degraded to ________.

How many molecules of carbon dioxide and water are needed to make a molecule of glucose in photosynthesis?

When L-(+) -idose is treated with bromine water, which of the following results?

Most monosaccharides are highly water soluble. Offer an explanation.