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BIOCHEM-LAB Finals > CARBOHYDRATES & CARBOHYDRATES Hydrolysis > Flashcards

CARBOHYDRATES & CARBOHYDRATES Hydrolysis Flashcards

1
Q

Maltose and galactose are both positive in Moore’s test, what test can identify one from another?

A

BARFOED’S TEST

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2
Q

the bond that connects monomer units in carbohydrates

A

GLYCOSIDIC BOND

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3
Q

What polysaccharide unit in starch that is attracted to iodine creates a positive reaction to starch?

A

AMYLOSE

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4
Q

Before becoming an anomeric carbon, what is the original functional group of anomeric carbon?

A

Ketone/Aldehyde

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5
Q

Galactose will form what type of cyclic monosaccharide?

A

Aldohexose

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6
Q

What type of glycosidic bond is there in sucrose that makes it a nonreducing sugar?

A

a 1,2

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7
Q

Moore’s test will only react to reducing sugars that can undergo aldol condensation (caramelization in sugars), this is due to the presence of _____?

A

Free Anomeric Carbon

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8
Q

What is the oxidizing agent in Barfoed’s Test?

A

Copper Sulfate

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9
Q

Monomer units in amylose is connected via alpha-1,4 glycosidic bond. Why is amylose considered as nonreducing sugar?

A

Because it’s not a monosaccharide, but rather a polysaccharide and doesn’t have a free anomeric carbon

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10
Q

___ is the type of glycosidic bond that connects monomer units in maltose.

A

Alpha, 1,4

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11
Q

Glycosidic bond is connected in between what elements?

A

Oxygen and Carbon

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12
Q

What is the reducing agent in mucic acid test?

A

HNO3/Nitric Acid

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13
Q

What carbon number does anomeric carbon in Fructose is in the Fischer projection (not cyclic)?

A

Carbon 2

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14
Q

Sucrose and fructose are both positive in Seliwanoff’s test, what test can identify one from the other?

A

Barfoed’s Test, Sucrose is disaccharide while fructose is a monosaccharide

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15
Q

According to functional group and number of carbons, classify galactose.

A

Aldohexose

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16
Q

Moore’s test will only react to reducing sugars that can undergo aldol condensation (caramelization in sugars), this is due to the presence of ____.

A

Free anomeric Carbon

17
Q

A ribose will form what type of cyclic monosaccharide?

A

Aldopentose

18
Q

What is the purpose of Barfoed’s Test?

A

Test for monosaccharides

19
Q

What is the chemical identity of the red precipitate in Barfoed’s Test?

A

Cu2O/Copper oxide

20
Q

Glycosidic bond in lactose uses anomeric carbon. Why does lactose still a reducing sugar?

A

because it’s a disaccharide that have a free anomeric carbon.

21
Q

What makes fructose a reducing sugar?

A

It’s a monosaccharide with free anomeric carbon

22
Q

According to functional group and number of carbons, classify glucose.

A

aldohexose

23
Q

Before becoming an anomeric carbon, what is the original functional group of anomeric carbon?

A

Aldehyde/Ketone

24
Q

Galactose will form what type of cyclic monosaccharide?

A

Pyranose

25
Q

Seliwanoff’s test will only react to sugars with fructose this is due to the presence of ___?

A

Ketone group/Ketose

26
Q

What is the oxidizing agent in Moore’s Test

A

NaOH/Sodium Hydroxide

27
Q

Monomer units in sucrose is connected via alpha1-2 glycosidic bond. Why is sucrose considered as nonreducing sugar?

A

It’s a disaccharide without a free anomeric carbon

28
Q

Maltose and galactose are both positive to mucic acid test, what test can identify one from the other?

A

Barfoed’s Test

29
Q

What makes lactose a reducing sugar?

A

Due to the presence of the the free anomeric carbon

30
Q

According to functional group and number of carbons, classify fructose.

A

Ketopentose

31
Q

What polysaccharide unit in starch that is attracted to iodine that creates a positive reaction to starch?

A

Amylose

32
Q

Galactose will form what type of cyclic monosaccharide?

A

Pyranose

BIOCHEM-LAB Finals (2 decks)

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