Question 1

Which of the following statements best describes the difference between D-glucose and D-galactose?

Accepted Answer

D-glucose and D-galactose differ in the arrangement of the hydroxyl group on carbon 4.

Question 2

Which of the following is the correct Fischer projection for D-fructose?

Accepted Answer

A six-carbon chain with a ketone group at carbon 2 and the hydroxyl group on carbon 5 on the right.

Question 3

Which of the following best explains why D-glucose is called 'blood sugar'?

Accepted Answer

It is the primary carbohydrate found in the bloodstream and is used as an energy source by cells.

Question 4

What is the molecular formula for D-glucose, D-galactose, and D-fructose?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 5

In a Fischer projection, how do you determine if a monosaccharide is a D- or L-isomer?

Accepted Answer

By the position of the hydroxyl group on the chiral carbon farthest from the carbonyl group.

Question 6

Which of the following best describes the process of mutarotation in glucose?

Accepted Answer

The interconversion between $$\alpha-D-$$glucose and $$\beta-D-$$glucose in solution.

Question 7

Which of the following symptoms is most likely associated with hypoglycemia?

Accepted Answer

Dizziness, general weakness, and muscle tremors.

Question 8

Which of the following best describes the formation of a Haworth structure from a Fischer projection?

Accepted Answer

The carbonyl group reacts with a hydroxyl group on the same molecule to form a ring.

Question 9

Which carbon atoms are involved in the ring closure to form the Haworth structure of D-glucose?

Accepted Answer

The oxygen on carbon 5 bonds to carbon 1.

Question 10

Which of the following is true about D-fructose compared to D-glucose?

Accepted Answer

D-fructose is a ketohexose, while D-glucose is an aldohexose.

Question 11

A patient is diagnosed with diabetes mellitus. Which of the following best explains the biochemical cause of their hyperglycemia?

Accepted Answer

The pancreas is unable to produce sufficient quantities of insulin.

Question 12

Which of the following best describes the Haworth structure of D-galactose compared to D-glucose?

Accepted Answer

The hydroxyl group on carbon 4 is above the ring in D-galactose.

Question 13

Which of the following is a correct description of high-fructose corn syrup (HFCS)?

Accepted Answer

It is produced by enzymatically breaking down sucrose into glucose and fructose.

Question 14

Which of the following best describes the difference between an $$\alpha- $$and $$\beta-$$anomer in the Haworth structure of glucose?

Accepted Answer

The position of the hydroxyl group on carbon 1 relative to the ring.

Question 15

Which of the following is a real-life consequence of an overproduction of insulin by the pancreas?

Accepted Answer

Hypoglycemia, resulting in low blood sugar and symptoms such as dizziness.

Question 16

Which of the following steps is NOT part of drawing a Haworth structure from a Fischer projection?

Accepted Answer

Adding a phosphate group to the sugar.

Question 17

Which of the following best describes the role of D-galactose in the human body?

Accepted Answer

It is important in the cellular membranes of the brain and nervous system.

Question 18

Which of the following is a correct application of the D/L notation in monosaccharides?

Accepted Answer

If the hydroxyl group on the chiral carbon farthest from the carbonyl group is on the right, it is a D-isomer.

Question 19

Which of the following best explains why fructose forms a five-membered ring in its Haworth structure?

Accepted Answer

The hydroxyl group on carbon 5 reacts with the carbonyl group on carbon 2.

Question 20

A patient’s blood glucose level is measured at 250 mg/dL two hours after ingesting glucose. Which condition does this most likely indicate?

Accepted Answer

Hyperglycemia, possibly due to diabetes mellitus.

Carbohydrates: Fischer and Haworth Structures, Isomerism, and Health Implications

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