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Example Questions
Example Question #81 : Identifying Biochemical Molecules
Identify the given structure.
D-glucose
D-alrose
D-gulose
D-mannose
D-allose
D-mannose
D-mannose is an aldohexose. Aldo indicates the aldehyde on the first carbon and the hexose indicates a six-carbon sugar. The D-isomer is determined by the orientation of the highest number asymmetric carbon, which has a hydroxyl group pointing to the right in the Fischer projection.
Example Question #82 : Identifying Biochemical Molecules
Identify the given structure.
D-ribulose
D-sucrose
D-glucose
D-mannose
D-ribose
D-ribose
D-ribose is an aldopentose. Aldo indicates the aldehyde on the first carbon and the pentose indicates a five-carbon sugar. The D-isomer is determined by the orientation of the highest number asymmetric carbon, which has a hydroxyl group pointing to the right in the Fischer projection.
Example Question #83 : Identifying Biochemical Molecules
Identify the given structure.
D-sorbose
L-fructose
D-fructose
D-glucose
L-sorbose
D-sorbose
The pictured ketohexose is D-sorbose. Keto indicates the ketone present on carbon number two and hexose indicates a six-carbon sugar. The D-isomer is determined by the orientation of the highest number asymmetric carbon, which has a hydroxyl group pointing to the right in the Fischer projection.
Example Question #84 : Identifying Biochemical Molecules
Identify the carbohydrate class of the given molecule.
Aldopentose
Ketopentose
Ketalhexose
Ketohexose
Aldohexose
Ketohexose
The structure is of a ketohexose. Keto- refers to the ketone at the second carbon and hexose refers to a carbohydrate with six carbons.
Example Question #85 : Identifying Biochemical Molecules
Identify the carbohydrate class of the given molecule.
Ketopentose
Ketohexose
Aldopentose
Hemiketose
Aldohexose
Aldohexose
The structure is of an aldohexose. Aldo- refers to the aldehyde at the first carbon, and the hexose refers to a carbohydrate with six carbons.
Example Question #297 : Biochemistry
Identify the carbohydrate class of the given molecule.
Aldopentose
Aldoquintos
Ketohexose
Aldohexose
Ketopentose
Aldopentose
The structure is an aldopentose. Aldo- refers to the aldehyde at the first carbon and pentose refers to a carbohydrate with five carbons.
Example Question #31 : Identification By Structure
Identify the carbohydrate class of the given molecule.
Ketohexose
Aldohexose
Ketopentose
Ketoquintos
Aldopentose
Ketopentose
The structure is a ketopentose. Keto- refers to the ketone at the second carbon and pentose refers to a carbohydrate with five carbons.
Example Question #32 : Identification By Structure
Identify the given structure.
D-glucose
L-glucose
L-galactose
D-galactose
D-fructose
D-glucose
This ring structure is of D-glucose. The hydroxyl group on the first carbon (the carbon to the bottom right of the oxygenin the ring) can face either down (the alpha conformation) or up (the beta conformation). Note that the beta conformer is more thermodynamically stable since all the hydroxyl groups on the ring would be in the equitorial position, thus minimizing steric hinderance and intramolecular electrostatic repulsion.
Example Question #33 : Identification By Structure
Identify the given structure.
D-glucose
D-mannose
D-ribose
D-fructose
D-galactose
D-fructose
This is the ring/cyclic structure of D-fructose.
Example Question #34 : Identification By Structure
Which of the following is the correct structure of a disaccharide?
Lactose = galactose + galactose
Maltose = glucose + glucose
Maltose = sucrose + fructose
Lactose = galactose + fructose
Sucrose = glucose + glucose
Maltose = glucose + glucose
The correct structures of the disaccharides are:
Maltose = glucose + glucose
Sucrose = glucose + fructose
Lactose = glucose + galactose
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