Set of Important MCQs on Chemistry of Carbohydrate for the preparation of test for chemistry and biology.
What are the constituents of the structure of ‘Agar’, the common culture medium for microbes in the laboratory?
- D-Glucose derivative and L-Galactose
- D-Mannose derivative and D- Galactose
- D-Galactose and an L-Galactose derivative
- An L-Mannose derivative and D-Galactose
Question’s Answer: D-Galactose and an L-Galactose derivative
Treatment of sucrose with conc. HNO3 provides which of the following?
- Oxalic acid
- Glucose + Fructose
- Nitrosucrose
- Laevulinic acid
Question’s Answer: Nitrosucrose
Glucose and fructose react with which reagent to give similar product?
- Tollen’s reagent
- Hydroxyl amine
- Phenyl hydrazine
- All of these
Question’s Answer: Phenyl hydrazine
Epimers are compounds that vary in
- Functional group
- Configuration at any carbon
- Ring size
- Configuration at a-carbon
Question’s Answer: Configuration at a-carbon
Method used to ascent the series of aldoses is called
- Weerman’s reaction
- Ruff’s method
- Kilian synthesis
- Wohl’s synthesis
Question’s Answer: Kilian synthesis
Mutarotation is exhibited by
- All carbohydrates
- All disaccharides
- All polysaccharides
- All monosaccharides
Question’s Answer: All monosaccharides
In ______ a freshly prepared solution of glucose has a specific rotation of +110° but on keeping for some time it changes to +52.7°.
- Mutarotation
- Alternation
- Epimerization
- None of these
Question’s Answer: Mutarotation
Though fructose is laevorotatory yet its name is written as D-fructose. This ‘D’. prefix indicate which of the following?
- Specific rotation
- Generic relationship with d-glyceraldehydes
- Generic relationship with d-glucose
- Mutarotation
Question’s Answer: Generic relationship with d-glyceraldehydes
Configuration of carbohydrates relative to glyceraldehydes was suggested by which of the following?
- Rosanoff
- Hirst
- Howarth
- Fischer
Question’s Answer: Hirst
A specific diagnostic test for carbohydrates is
- Molisch’s test
- Tollen’s test
- Fehling’s test
- Osazune formation
Question’s Answer: Molisch’s test
Glucose and mannose may be obtained by Kiliani synthesis from which of the following?
- D-ribose
- D-xylose
- D-arabinose
- D-lyxose
Question’s Answer: D-arabinose
Acetylation of fructose yields a
- Pentacetyl derivative
- Diacetyl derivative
- Tetraethyl derivative
- Monodactyl derivative
Question’s Answer: Pentacetyl derivative
Although glucose has an aldehydic group it does not restore pink colour of Schiff’s reagent. It is because
- There is steric hindrance
- -I effect of hydroxyl groups
- Aldehydic group is involved in hemiacetal formation
- There is no aldehydic group in glucose
Question’s Answer: Aldehydic group is involved in hemiacetal formation
In _______ Isomers differing in configuration at the asymmetric carbon produced due to hemiacetal ring formation in carbohydrates.
- Epimers
- Anomers
- Conformers
- Tautomers
Question’s Answer: Anomers
The ring structure of glucose does not explain _______.
- Stereochemistry of glucose
- Mutarotation phenomenon
- Existence of two forms of glucose
- No reaction with Schiff’s reagent
Question’s Answer: Stereochemistry of glucose
Hydrolysis of methyl glucoside tetramethyl-D followed by oxidation provides which of the following?
- Arabinotrimethoxy glutaric acid
- Ribotrimethoxy glutaric acid
- Xylotrimethoxy glutaric acid
- Dimethoxy succinic acid
Question’s Answer: Xylotrimethoxy glutaric acid
Which of the polysaccharide on hydrolysis provides only fructose?
- Cellulose
- Amylopectin
- Inulin
- Amylose
Question’s Answer: Inulin
Which of the following is the test that may be used to distinguish between glucose and fructose?
- Schiff’s reagent test
- Selivenoff’s test
- Tollen’s reagent test
- Fehling’s solution test
Question’s Answer: Selivenoff’s test
Which is not a method for determining ring size in carbohydrates?
- Haworth and Hirst method
- Lactone formation method
- Molisch method
- Periodic acid oxidation method
Question’s Answer: Molisch method
Nucleoside adenosine on hydrolysis which of the following?
- Purine base + Deoxyribose
- Purine base + Ribose
- Pyrimidine base + Ribose
- Pyrimidine base + Deoxyribose
Question’s Answer: Purine base + Ribose
Which reaction is shown by sucrose?
- Osazone formation
- Molisch’s test
- Oxime formation
- Tollen’s test
Question’s Answer: Molisch’s test
Cellulose is made up of molecules of which of the following?
- Fructose
- Glucose
- B-Fructose
- B-glucose
Question’s Answer: B-glucose
Methylation of sucrose yields which of the following?
- Monomethyl derivative
- Octamethyl derivative
- Tetramethyl derivative
- Dimethyl derivative
Question’s Answer: Octamethyl derivative
Inverted sugar is
- Sucrose
- Any mixture of glucose and fructose
- Mixture of glucose and fructose obtained on hydrolysis of sucrose
- Hydrolysis of insulin
Question’s Answer: Mixture of glucose and fructose obtained on hydrolysis of sucrose
Which disaccharide is a non-reducing sugar?
- Lactose
- Maltose
- Sucrose
- Maltase
Question’s Answer: Sucrose
Hydrolysis of D-lactose provides
- Glucose + Galactose
- Galactose + Fructose
- Glucose + Fructose
- It is not hydrolysed
Question’s Answer: Glucose + Galactose
Which is a disaccharide which on hydrolysis provides only one specific monosaccharide?
- Sucrose
- Maltose
- Lactose
- None of these
Question’s Answer: None of these
Identify a trisaccharide
- Raffinose
- Lactose
- Amylose
- Gentiobiose
Question’s Answer: Raffinose
Which is characteristic of amylase?
- It consists of a-D-glucopyranose units
- It is a reducing carbohydrate
- It has 1,4-a-glycosidic linkages
- It is linear polymer
Question’s Answer: It is a reducing carbohydrate
Which is not a form of cellulose?
- Jute
- Cotton
- Silk
- Hemp
Question’s Answer: Silk
What is the main difference in the structure of constituting units of starch and cellulose?
- In starch a-D-glucopyranose units are present but in cellulose these are ẞ-D-glucopyranose units
- In starch a-D-glucofuranose units are present but in cellulose these are ẞ-D-glucofuranose units
- In starch B-D-glucopyranose units are present but in cellulose these are a-D- glucopyranose units
- In starch B-D-glucofuranose units are present but in cellulose these are a-D- glucofuranose units
Question’s Answer: In starch a-D-glucopyranose units are present but in cellulose these are ẞ-D-glucopyranose units
Which of the following is the reagent which may be used to distinguish between starch and cellulose?
- Tollen’s reagent
- Acetic anhydride
- Iodine solution
- Fehling’s solution
Question’s Answer: Iodine solution
Synthetic silk called viscose rayon is _____ .
- Regenerated cellulose
- Regenerated starch
- Cellulose nitrate
- None of these
Question’s Answer: Regenerated cellulose
Collodion or pyroxlin is
- Cellulose trinitrate
- Mixture of cellulose mono-and dinitrates
- Cellulose triacetate
- Mixture of cellulose mono- and diacetates
Question’s Answer: Mixture of cellulose mono-and dinitrates
Which one of the following is non-reducing disaccharide?
- Lactose
- Maltose
- Cellobiose
- None of these
Question’s Answer: None of these
Hydrolysis of starch with enzyme amylase produceswhich of the following?
- Glucose
- Maltose
- Dextrins
- All of these
Question’s Answer: Dextrins
Carbohydrates are characterized by the presence of which of the following?
- Asymmetric carbon
- Carbonyl group
- Hydroxyl group
- All of these
Question’s Answer: All of these
Which is not a polysaccharide?
- Insulin
- Cellulose
- Cellobiose
- Amylase
Question’s Answer: Cellobiose
Which interactions is not a stabilizing factor in the 3-D structure of polysaccharides?
- Hydrophobic interactions
- Disulphide bonds
- Hydrogen bonding
- Electrostatic interactions
Question’s Answer: Disulphide bonds
Which is an epimer of glucose?
- A Fructose
- Ribose
- Galactose
- Maltose
Question’s Answer: Galactose
Which is true regarding open chain structure of Glucose?
- There are four asymmetric carbons
- There are five asymmetric carbons
- There are six asymmetric carbons
- There are three asymmetric carbons
Question’s Answer: There are four asymmetric carbons
Which disaccharides to contains a-1-1-glycosidic linkage?
- Sucrose
- Lactose
- Trehalose
- Maltose
Question’s Answer: Trehalose
Honey is rich in the hydrolytic product of which of the following?
- Inulin
- Maltose
- Lactose
- Starch
Question’s Answer: Inulin
Which of the following is a polymeric unit of starch which has branched structure?
- Chitin
- Amylose.
- Glycogen
- Amylopectin
Question’s Answer: Amylopectin
Which disaccharides is not a plant product?
- Maltose
- Lactose
- Sucrose
- None
Question’s Answer: Lactose
Which is true about the structure of cellulose?
- The main back bone of a-1-4-linkages and branches with 8-1-6-linkages
- The main back bone of 8-1-4-linkages and no branches
- The main back bone of 8-1-6-linkages and branches with 8-1-4-linkages
- The main back bone of a -1-4-linkages and no branches
Question’s Answer: The main back bone of 8-1-4-linkages and no branches
What is the general formula for the polysaccharides?
- (CH2O)n
- (CH12O)n
- (C&H₁Os)n
- (C6H10O6)n
Question’s Answer: (C&H₁Os)n
Which is the distinguishing test between monosaccharides and disaccharides?
- Barfoed’s Test
- Bial’s Test
- Seliwanoff’s Test
- Hydrolysis Test
Question’s Answer: Barfoed’s Test
The copper in Barfoed’s Solution is not reduced by which of the following?
- Glucose
- Sucrose
- Mannose
- Ribose
Question’s Answer: Sucrose
Iodine solution provides no colour with which of the following
- Glycogen
- Starch
- Dextrin
- Cellulose
Question’s Answer: Cellulose
Which is not a polymer of D-Glucose?
- Inulin
- Amylose
- Starch
- Glycogen
Question’s Answer: Inulin
What is the reason for the selection of furanose (Riboses) rather than pyranose (Glucoes) for nucleic acids?:
- Furanose ring is more stable than Pyranose.
- Furanose ring is more flexible than Pyranose.
- It is sterically difficult to incorporate a Pyranose ring in the double helix.
- Furanose phosphodiesters are easier to form.
Question’s Answer: Furanose ring is more flexible than Pyranose
Which has been isolated from human heart muscles?
- D-Arabinose
- D-Ribose
- D-Lyxose
- D-xylose
Question’s Answer: D-Lyxose
Benedict’s test is likely to give weakly positive results with concentrated due to the action of
- Uric acid
- Ammonium salts
- Urea
- Phosphates
Question’s Answer: Uric acid
Dextran is a polymer of glucose units. What type of linkages is predominant in its structure?
- a-1, 6-Glycosidic linkages
- 8-1, 4-Glycosidic linkages
- 6-1, 2 and 8-1, 3 Glycosidic linkages
- All of these
Question’s Answer: a-1, 6-Glycosidic linkages
Which carbohydrates makes the terminal residue in ‘O’ substance (H-antigen) – the mother antigen of ‘ABO’ Blood group substances?
- N-AcGlu
- Fucose
- Gal
- Xylose
Question’s Answer: Fucose
Chitin that forms the exoskeleton of crustaceans consists of:
- 8-1-4-linkages between glucose residues
- a-1-4-linkages between N-acetyl-glucosamine residues
- 8-1-4-linkages between N-acetyl-glucosamine and the glucose residues
- 8-1-4-linkages between N-acetyl- glucosamine residues
Question’s Answer: 8-1-4-linkages between N-acetyl- glucosamine residues
Which is considered as the most abundant organic compound in the biosphere?
- Starch
- Chitin
- Hyaluronidase
- Cellulose
Question’s Answer: Cellulose
Whichcarbohydrates is polymerized through 8-1, 4 glycosidic linkages?
- Amylose.
- Lactose
- Sucrose
- Maltose
Question’s Answer: Lactose
8-Amylase of malt hydrolyses starch by:
- Hydrolyzing the internal-glycosidic linkages
- Removing the glucose molecules from the reducing end
- Removing maltose units from the non-reducing end
- Hydrolyzing-glycosidic linkages
Question’s Answer: Removing maltose units from the non-reducing end
Phosphorylation of the carbohydrates makes the molecule anionic’, what could be the purpose of this ionization?
- The negative charge results in better interaction with the active site of enzymes
- It prevents the sugars from leaking out of the plasma membranes
- It creates reactive intermediates for the formation of N- and O-glycosidic linkages
- All of these
Question’s Answer: All of these
What is the systematic name of sucrose?
- 1-a-D-glucopyranosyl-2-B-D- fructofuranoside
- 1-a-D-glucopyranosyl-2-B-D-fructopyranoside
- 1-B-D-glucofuranosyl-2-a-D- fructopyranoside
- 1-8-D-glucofuranosyl-2-a-D-fructofuranoside
Question’s Answer: 1-a-D-glucopyranosyl-2-B-D-fructopyranoside
Which oligosaccharides mediates in the binding of H.Pylori to the gastric mucosa?
- Oligosaccharide that is part of Blood Group ‘O’ substance
- Oligosaccharide that is part of Blood Group ‘A’ substance
- Oligosaccharide that is part of Blood Group ‘B’ substance
- Oligosaccharide of ganglioside GM1
Question’s Answer: Oligosaccharide that is part of Blood Group ‘O’ substance
In patients with uncontrolled diabetes mellitus, Which about metabolic changes is true?
- Impaired uptake of glucose
- Increased rate of fatty acid oxidation
- Impaired synthesis of fatty acids
- All of these
Question’s Answer: All of these
During the synthesis of Sucrose, glucose is activated to Which moieties?
- UDP-Glucose
- Glucose-1-Phosphate
- Phospho-Glucosy 1-Phospho-Pyrophosphate
- Glucose-6-phosphate
Question’s Answer: UDP-Glucose
In the presence of dilute alkali, monosaccharides undergo reversible isomerisation. The reaction called ______.
- Kiliani reaction
- Weermann rearrangement
- Lobry de Bruyn van Ekenstein rearrangement
- Mutarotation
Question’s Answer: Lobry de Bruyn van Ekenstein rearrangement
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