Question 1

Which of the following statements best describes the role of insulin in blood glucose regulation after consuming a carbohydrate-rich meal?

Accepted Answer

Insulin is released by the pancreas and promotes glucose uptake by cells, lowering blood glucose levels.

Question 2

Which of the following is the correct general formula for carbohydrates?

Accepted Answer

$$C_n(H_2O)_n$$

Question 3

Which of the following is a constitutional isomer of D-glucose?

Accepted Answer

D-fructose

Question 4

A monosaccharide is classified as a D-sugar if:

Accepted Answer

The chiral center farthest from the carbonyl group has the same configuration as D-glyceraldehyde.

Question 5

Which of the following best describes the difference between an epimer and a diastereomer?

Accepted Answer

Epimers differ at exactly one chiral center, while diastereomers differ at one or more (but not all) chiral centers.

Question 6

Which of the following reactions is responsible for the cyclization of glucose to form a pyranose ring?

Accepted Answer

Nucleophilic attack of the C5 hydroxyl group on the C1 carbonyl carbon.

Question 7

Which of the following is true about reducing sugars?

Accepted Answer

They have a free aldehyde or ketone group capable of being oxidized.

Question 8

Which of the following best explains why glucose is the central compound of energy metabolism in most organisms?

Accepted Answer

Glucose can be readily oxidized to release energy and is the primary fuel for all cells.

Question 9

Which of the following correctly describes the formation of a glycosidic bond in a disaccharide?

Accepted Answer

It is formed when the anomeric carbon of one monosaccharide reacts with a hydroxyl group of another monosaccharide.

Question 10

Which of the following is the most stable cyclic form of D-glucose in aqueous solution?

Accepted Answer

$$\beta-D-$$glucopyranose

Question 11

Which of the following is NOT a function of carbohydrates in biological systems?

Accepted Answer

Catalyzing chemical reactions

Question 12

Which of the following statements about mutarotation is correct?

Accepted Answer

It is the process by which cyclic monosaccharides interconvert between $$\alpha$$ and $$\beta$$ anomers via the open-chain form.

Question 13

Which of the following best describes the difference between a hemiacetal and an acetal in carbohydrate chemistry?

Accepted Answer

A hemiacetal has one alkoxy and one hydroxyl group attached to the same carbon, while an acetal has two alkoxy groups.

Question 14

Which of the following is a correct description of the relationship between D-glucose and D-mannose?

Accepted Answer

They are epimers, differing at exactly one chiral center.

Question 15

Which of the following is a non-reducing disaccharide?

Accepted Answer

Sucrose

Question 16

Which of the following is the correct name for the glycosidic linkage in maltose?

Accepted Answer

$$\alpha-1$$,4-glycosidic bond

Question 17

Which of the following is a correct statement about the oxidation of aldoses?

Accepted Answer

Oxidation at C1 converts an aldose to its corresponding aldonic acid.

Question 18

Which of the following is a correct statement about the structure of monosaccharides?

Accepted Answer

Monosaccharides are polyhydroxy aldehydes or ketones with three or more carbon atoms.

Question 19

Which of the following is the building block of polysaccharides?

Accepted Answer

Monosaccharide

Monosaccharides and Carbohydrate Structure: Biochemistry I Study Notes

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