Q: Which of the following equations correctly represents the process of photosynthesis in plants?

$$CO_2 + H_2O$$ + \text{sunlight} \rightarrow (CH_2O)_n + $$O_2$$

Question 1

Which of the following best explains why carbohydrates are essential for cell identity?

Accepted Answer

Carbohydrates form glycoproteins and glycolipids on the cell surface, which are crucial for cell-cell recognition and signaling.

Question 2

Which structural feature distinguishes an aldose from a ketose monosaccharide?

Accepted Answer

The location of the carbonyl group: at the end for aldose, in the middle for ketose.

Question 3

Which of the following is a correct molecular formula for a carbohydrate with 6 carbon atoms?

Accepted Answer

$$C_6H_{12}O_6$

Question 4

A scientist discovers a polysaccharide in a plant cell wall that consists of $$\beta-$$glucose monomers joined by $$\beta-1$$,4-glycosidic linkages. Which polysaccharide has she most likely found?

Accepted Answer

Cellulose

Question 5

Which process is responsible for linking two monosaccharides together to form a disaccharide?

Accepted Answer

Condensation reaction

Question 6

Why are $$\beta-1$$,4-glycosidic linkages in cellulose difficult for most organisms to hydrolyze?

Accepted Answer

Because most organisms lack the enzymes required to break $$\beta-1$$,4-glycosidic bonds.

Question 7

Which of the following best describes the role of glycogen in animal cells?

Accepted Answer

Glycogen is a highly branched storage polysaccharide that can be broken down to release glucose for energy.

Question 8

Which enzyme is responsible for hydrolyzing starch in the human digestive system?

Accepted Answer

Amylase

Question 9

A patient is diagnosed with a bacterial infection. The bacteria are found to have a cell wall composed of peptidoglycan. Which structural feature is unique to peptidoglycan compared to other polysaccharides?

Accepted Answer

It has peptide bonds between adjacent strands.

Question 10

Which of the following equations correctly represents the process of photosynthesis in plants?

Accepted Answer

$$CO_2 + H_2O$$ + 	ext{sunlight} ightarrow (CH_2O)_n + $$O_2$$

Question 11

Which of the following statements about glycoproteins is correct?

Accepted Answer

Glycoproteins are important for cell-cell recognition on the external surface of animal cells.

Question 12

Which of the following is a direct consequence of the flipped orientation of every other glucose monomer in cellulose?

Accepted Answer

It generates a linear molecule that allows hydrogen bonds to form between adjacent, parallel strands.

Question 13

Which of the following is NOT a function of carbohydrates in cells?

Accepted Answer

Catalyzing metabolic reactions

Question 14

Which of the following best explains why carbohydrates store more energy than carbon dioxide?

Accepted Answer

Carbohydrates have more $$C-H$$ and $$C-C$$ bonds, which have higher potential energy than the $$C=O$$ and $$C-O$$ bonds in carbon dioxide.

Question 15

Which of the following polysaccharides is found in the exoskeletons of insects and crustaceans?

Accepted Answer

Chitin

Question 16

A researcher is studying the digestion of dietary fiber in humans. Which property of dietary fiber makes it important for digestive health?

Accepted Answer

It forms fibers that exclude water, making hydrolysis difficult and promoting digestive health.

Question 17

Which of the following is a correct description of the difference between amylose and amylopectin in starch?

Accepted Answer

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

Question 18

Which of the following reactions represents the breakdown of glucose to produce ATP in cells?

Accepted Answer

$$(CH_2O)_n + O_2$ + ADP + P_i \rightarrow CO_2$ + H_2O + ATP$$

Question 19

Which of the following is a real-world application of glycobiology in cancer therapy?

Accepted Answer

Targeting cancerous cells based on their altered surface glycosylation using protein therapies.

Chapter 5: An Introduction to Carbohydrates – Structure, Function, and Biological Roles

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