Question 1

Which of the following statements best explains why carbohydrates are considered more heterogeneous in size and composition compared to proteins and nucleic acids?

Accepted Answer

Carbohydrates are not synthesized based on a template, allowing for greater structural variation.

Question 2

What is the general chemical formula for carbohydrates produced by photosynthesis?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 3

Which of the following is NOT a major biological function of carbohydrates?

Accepted Answer

Catalyzing complex chemical reactions

Question 4

A monosaccharide with an aldehyde group is classified as which type of sugar?

Accepted Answer

Aldose

Question 5

How many stereoisomers are possible for a monosaccharide with 4 chiral carbons?

Accepted Answer

$$2^4 = 16$

Question 6

Which of the following best describes an epimer?

Accepted Answer

Two sugars that differ in configuration around a single carbon atom

Question 7

During cyclization of D-glucose, the carbonyl carbon becomes a new chiral center. What is this carbon called?

Accepted Answer

Anomeric carbon

Question 8

Which of the following correctly describes the difference between α and β anomers of D-glucopyranose?

Accepted Answer

They differ in the configuration around the anomeric carbon (C-1) after cyclization.

Question 9

Which type of glycosidic linkage is found in cellulose?

Accepted Answer

$\beta(1 \rightarrow 4)$$ linked D-glucose units

Question 10

Why is glycogen more suitable for rapid mobilization of glucose in animals compared to starch?

Accepted Answer

Glycogen is more branched and compact, allowing more sites for enzymatic action.

Question 11

What is the consequence of storing glucose in its monomeric form inside cells?

Accepted Answer

It increases the osmolarity, potentially leading to cell rupture.

Question 12

Which of the following is a homopolysaccharide found in the exoskeletons of arthropods?

Accepted Answer

Chitin

Question 13

Which statement best describes the role of carbohydrates in molecular recognition?

Accepted Answer

Carbohydrates on cell surfaces mediate cell-cell communication and recognition.

Question 14

Which of the following is a branched polysaccharide synthesized by plants for energy storage?

Accepted Answer

Amylopectin

Question 15

Which chemical reaction is responsible for the formation of a glycosidic bond between two monosaccharides?

Accepted Answer

Condensation (dehydration synthesis)

Question 16

Which of the following best explains why bulky substituents in pyranose rings occupy equatorial positions?

Accepted Answer

Equatorial positions minimize steric hindrance, making the structure more stable.

Question 17

Which of the following is a common disaccharide formed by an $$\alpha(1 \rightarrow 4)$$ glycosidic bond between two glucose units?

Accepted Answer

Maltose

Question 18

Which property of cellulose makes it suitable for plant cell walls?

Accepted Answer

Its unbranched, linear chains form strong hydrogen bond networks.

Question 19

Which of the following best describes the difference between D- and L-isomers of monosaccharides?

Accepted Answer

They are mirror images of each other, differing at all chiral centers.

Question 20

Which of the following is true regarding the interconversion of α and β anomers of glucose?

Accepted Answer

Interconversion occurs via the linear form of glucose.

Carbohydrates and Glycobiology: Structure, Function, and Stereochemistry

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