Question 1

L-Ribulose may be classified as ________.

Accepted Answer

L-Ribulose is a ketopentose, meaning it is a five-carbon sugar (pentose) that contains a ketone group.

Question 2

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

Accepted Answer

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Question 3

Draw the Fischer projection of the open chain form of L-allose.

Accepted Answer

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Question 4

Draw the structure of D-glyceraldehyde.

Accepted Answer

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Question 5

Given the structure of D-altrose below, draw the structure of L-altrose.

Accepted Answer

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Question 6

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

Accepted Answer

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Question 7

The structure of D-arabinose is shown below. Which of the following correctly describes the configurations of the asymmetric carbons in D-arabinose?

Accepted Answer

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Question 8

Most monosaccharides are highly water soluble. Offer an explanation.

Accepted Answer

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Question 9

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

Accepted Answer

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Question 10

Which is the C2 epimer of D-glucose?

Accepted Answer

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...

Question 11

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

Accepted Answer

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Question 12

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

Accepted Answer

D-(-)-gulose is an aldohexose, meaning it is a six-carbon sugar with an aldehyde group at one end. In its open-chain form, it has four carbon atoms (other than the carbonyl carbon and the terminal CH2OH group) that can each be a center of chirality (asymmetric center), as each of these carbons is bonded to four different groups.

Question 13

All naturally occurring sugars can be degraded to ________.

Accepted Answer

All naturally occurring sugars are D-sugars and can be degraded to D-(+)-glyceraldehyde, which serves as a reference point for the D/L and (+/-) designation in sugars.

Question 14

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

Accepted Answer

The answer of Draw the Fischer projection for the open-chain...

Question 15

All chiral D-sugars rotate plane-polarized light ________.

Accepted Answer

The direction in which a chiral sugar rotates plane-polarized light cannot be predicted solely based on its D- or L- configuration. It must be determined experimentally.

Question 16

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

Accepted Answer

Six molecules of carbon dioxide and six molecules of water are needed to make one molecule of glucose in photosynthesis. This can be represented by the following equation: 6CO2 + 6H2O → C6H12O6 + 6O2.

Question 17

Draw the C3 epimer of L-glucose.

Accepted Answer

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Question 18

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

Accepted Answer

In the Fischer projection of D-(+)-glyceraldehyde, the hydroxyl group on the asymmetric carbon is on the right side. This is characteristic of D-sugars.

Question 19

Provide the structure of the open-chain form of D-galactose.

Accepted Answer

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Question 20

Provide the structure of the open-chain form of L-altrose.

Accepted Answer

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Quiz 23: Carbohydrates and Nucleic Acids

L-Ribulose may be classified as ________.

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

Draw the Fischer projection of the open chain form of L-allose.

Draw the structure of D-glyceraldehyde.

Given the structure of D-altrose below, draw the structure of L-altrose.

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

The structure of D-arabinose is shown below. Which of the following correctly describes the configurations of the asymmetric carbons in D-arabinose?

Most monosaccharides are highly water soluble. Offer an explanation.

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

Which is the C2 epimer of D-glucose?

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

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

All naturally occurring sugars can be degraded to ________.

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

All chiral D-sugars rotate plane-polarized light ________.

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

Draw the C3 epimer of L-glucose.

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

Provide the structure of the open-chain form of D-galactose.

Provide the structure of the open-chain form of L-altrose.