Type

Question 1

Qu’est-ce qu’une liaison glycosidique?

Answer 1

Une liaison covalente formée entre le carbone anomérique d’un ose et un groupement hydroxyle, amine ou thiol d’une seconde molécule.

Question 2

Quels types de liaisons glycosidiques existent?

Answer 2

O-glycosidique, N-glycosidique, S-glycosidique.

Question 3

Quel type de liaison est formé dans les polymères d’oses?

Answer 3

Des liens O-glycosidiques.

Question 4

Que se passe-t-il lorsque le carbone anomérique d’un ose forme une liaison glycosidique?

Answer 4

Il n’y a plus de mutarotation et la configuration anomérique est gelée.

Question 5

Quelle est la configuration du carbone anomérique pour une liaison α glycosidique?

Answer 5

Carbone anomérique gelé en position α.

Question 6

Quelle est la configuration du carbone anomérique pour une liaison β glycosidique?

Answer 6

Carbone anomérique gelé en position β.

Question 7

Vrai ou faux: La formation d’une liaison glycosidique permet la linéarisation de l’ose.

Answer 7

Faux.

Question 8

Complétez: Les résidus d’oses dans les polymères sont liés par des _______.

Answer 8

liens O-glycosidiques.

Question 9

What are holosides?

Answer 9

Polymers formed exclusively of oses or derivatives of oses linked by O-glycosidic bonds

Holosides consist of monosaccharides linked together, which can vary in structure and complexity.

Question 10

How are O-glycosidic bonds formed?

Answer 10

Between the anomeric carbon of one ose and a hydroxyl group of another ose

This type of bond is crucial for the formation of disaccharides and polysaccharides.

Question 11

What does the versatility of the glycosidic bond indicate?

Answer 11

It leads to a great diversity of holosides

The various configurations and linkage possibilities contribute to the structural diversity of carbohydrates.

Question 12

How many possible glycosidic linkages can be formed between two oses?

Answer 12

10 possible linkages

This is due to the anomeric carbon’s ability to link with multiple hydroxyl groups and its configuration.

Question 13

What configurations can the anomeric carbon take before forming a glycosidic bond?

Answer 13

α or β configuration

The choice of configuration affects the properties and digestibility of the resulting glycosidic bond.

Question 14

How is a glycosidic bond described?

Answer 14

By indicating the anomeric configuration followed by the carbon atom numbers involved

This notation helps in identifying the specific type of bond and its structure.

Question 15

How are holosides categorized?

Answer 15

According to the number of residues they contain

The main categories are monosaccharides, disaccharides, and polysaccharides.

Question 16

What are disaccharides made of?

Answer 16

2 residues of oses or derivatives of oses linked together

Disaccharides are a common form of sugar, such as sucrose and lactose.

Question 17

Fill in the blank: Holosides are linked by _______.

Answer 17

O-glycosidic bonds

This type of bond is essential for carbohydrate structure.

Question 18

What are holosides?

Answer 18

Polymers formed exclusively of sugars or sugar derivatives linked by O-glycosidic bonds.

Holosides consist of monosaccharides connected through glycosidic linkages.

Question 19

How are O-glycosidic bonds formed?

Answer 19

Between the anomeric carbon of one sugar and a hydroxyl group of another sugar.

This type of bond is crucial for the formation of disaccharides and polysaccharides.

Question 20

What is the significance of the versatility of glycosidic bonds?

Answer 20

It explains the great diversity of holosides.

Different configurations and bonding options lead to a variety of polysaccharides.

Question 21

How many possibilities of glycosidic linkages exist between two sugars?

Answer 21

10 possibilities.

This is due to the five hydroxyl groups on the second sugar and the two anomeric configurations (α and β) of the first sugar.

Question 22

What is indicated when describing a glycosidic bond?

Answer 22

The anomeric configuration followed by the carbon atom numbers involved.

This notation helps in identifying the specific type of glycosidic linkage.

Question 23

Fill in the blank: The carbon anomeric of the first sugar can take the configuration _______ or _______ before forming the bond.

Answer 23

α, β

Question 24

True or False: The diversity of holosides is solely due to the number of different sugars involved.

Answer 24

False

Question 25

What role do the hydroxyl groups play in forming glycosidic bonds?

Answer 25

They serve as the sites for bonding with the anomeric carbon of another sugar.

The positioning and orientation of these groups determine the type of glycosidic linkage formed.