Question 1

Which of the following statements best explains why glucose is considered an essential energy source for most cells?

Accepted Answer

Glucose is the primary substrate for cellular respiration, producing ATP efficiently.

Question 2

Which chemical formula represents a hexose monosaccharide such as glucose, galactose, or fructose?

Accepted Answer

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

Question 3

A patient is diagnosed with a deficiency in the enzyme that breaks down lactose. Which disaccharide is affected, and what are its monosaccharide components?

Accepted Answer

Lactose; glucose and galactose

Question 4

Which test would you use to detect the presence of simple reducing sugars in a food sample, and what color change indicates a positive result?

Accepted Answer

Benedict's solution; blue to orange/red

Question 5

Which polysaccharide is found in the exoskeleton of insects and the cell walls of fungi, and what is its distinguishing chemical feature?

Accepted Answer

Chitin; contains glucose units with a nitrogen side chain

Question 6

Which of the following best describes the difference between $$\alpha-$$glucose and $$\beta-$$glucose?

Accepted Answer

They differ in the position of the hydroxyl group on carbon 1.

Question 7

Which polysaccharide is the primary structural component of plant cell walls and is composed of $$\beta-$$glucose units?

Accepted Answer

Cellulose

Question 8

A food scientist wants to test for the presence of starch in a sample. Which reagent should be used, and what is the expected color change if starch is present?

Accepted Answer

Lugol's iodine; yellow-brown to dark purple/black

Question 9

Which statement correctly describes the branching structure of glycogen compared to amylopectin?

Accepted Answer

Glycogen has more frequent and shorter branches than amylopectin.

Question 10

Which equation represents the overall reaction for aerobic respiration of glucose in cells?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + O_2$ \rightarrow CO_2$ + H_2O + Energy}$$

Question 11

Which of the following is a correct statement about isomers in carbohydrates?

Accepted Answer

Isomers have the same molecular formula but different arrangements of atoms.

Question 12

A person is experiencing symptoms of ketosis due to inadequate carbohydrate intake. What is the minimum daily amount of carbohydrates recommended to avoid ketosis?

Accepted Answer

50–100 grams

Question 13

Which of the following best describes the role of insulin in glucose homeostasis?

Accepted Answer

Insulin promotes the uptake of glucose from the blood into cells.

Question 14

Which of the following carbohydrates is NOT digestible by humans and acts as dietary fiber?

Accepted Answer

Cellulose

Question 15

Which of the following is a correct statement about the glycosidic bonds in starch and cellulose?

Accepted Answer

Starch contains $$\alpha-1$$,4 glycosidic bonds, while cellulose contains $$\beta-1$$,4 glycosidic bonds.

Question 16

Which of the following is a structural isomer of glucose?

Accepted Answer

Fructose

Question 17

Which dietary recommendation is supported by the study materials for carbohydrate intake?

Accepted Answer

Consume at least 58% of calories from carbohydrates, with no more than 10% from simple, refined sugars.

Question 18

Which of the following statements about amylose and amylopectin is correct?

Accepted Answer

Amylose is linear, while amylopectin is branched.

Question 19

Which monosaccharide is the sweetest and is commonly found in honey and fruits?

Accepted Answer

Fructose

Question 20

Which of the following correctly matches a carbohydrate with its primary function in the human body?

Accepted Answer

Glycogen; reserve energy storage in muscles and liver

8-Carbohydrates: Structure, Function, and Metabolism in Cell Biology

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