Question 1

Which of the following best describes the molecular formula of most monosaccharides?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 2

Glucose and galactose are both hexoses. Which structural feature distinguishes galactose from glucose?

Accepted Answer

The position of the hydroxyl group on carbon 4

Question 3

Which of the following statements about the ring formation of glucose in aqueous solution is correct?

Accepted Answer

The ring is formed by a reaction between the carbonyl group at C1 and the hydroxyl group at C5

Question 4

Which of the following is a disaccharide formed by a dehydration reaction between glucose and fructose?

Accepted Answer

Sucrose

Question 5

What type of bond is formed when two monosaccharides join together via a dehydration reaction?

Accepted Answer

Glycosidic linkage

Question 6

Which polysaccharide is the main storage form of carbohydrates in animals?

Accepted Answer

Glycogen

Question 7

Cellulose and starch are both polymers of glucose. What is the key difference in their structure?

Accepted Answer

Cellulose has $$\beta-1$$,4 glycosidic linkages, while starch has $$\alpha-1$$,4 glycosidic linkages

Question 8

Why can humans digest starch but not cellulose?

Accepted Answer

Humans have enzymes that hydrolyze $$\alpha$$ linkages but not $$\beta$$ linkages

Question 9

Which structural polysaccharide is found in the exoskeleton of arthropods and is used in surgical thread?

Accepted Answer

Chitin

Question 10

Which of the following best explains the role of sugars in cell recognition?

Accepted Answer

Sugars modify proteins and lipids on cell surfaces, allowing cells to appear 'sugar-coated' and participate in cell–to–cell communication

Question 11

Which of the following is a real-world example of a symbiotic relationship involving carbohydrate digestion?

Accepted Answer

Cows rely on cellulose-digesting prokaryotes in their gut to break down plant material

Question 12

Which carbohydrate is a major component of the extracellular matrix (ECM) and is linked to proteins to form proteoglycans?

Accepted Answer

Polysaccharides

Question 13

Which of the following best describes the function of peptidoglycan in bacteria?

Accepted Answer

It forms the cell wall, providing structural support

Question 14

Which of the following is a correct description of amylose and amylopectin?

Accepted Answer

Amylose is unbranched with $$\alpha-1$$,4 linkages, while amylopectin is branched with $$\alpha-1$$,6 linkages

Question 15

Which of the following is NOT a function of carbohydrates in living organisms?

Accepted Answer

Catalyzing chemical reactions

Question 16

Which of the following best describes the role of glycoproteins and glycolipids in the cell membrane?

Accepted Answer

They are involved in cell–to–cell recognition and communication

Question 17

Which of the following is a correct application of chirality in biology?

Accepted Answer

Enantiomers such as D- and L-glucose have different biological activities

Question 18

A patient is diagnosed with a genetic disorder that affects the breakdown of glycosidic linkages in lysosomes. Which cellular process is most likely impaired?

Accepted Answer

Degradation of glycoproteins and glycolipids

Question 19

Which of the following best explains why cellulose is an effective structural material in plants?

Accepted Answer

Cellulose molecules form microfibrils held together by hydrogen bonds

Question 20

Which of the following carbohydrates is most likely to be found in the cell wall of fungi?

Accepted Answer

Chitin

Carbohydrates: Structure, Function, and Biological Roles

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