All Biochemistry Resources
Example Questions
Example Question #11 : Identifying Specific Carbohydrate Structures
Which of the following is a storage polysaccharide of plants?
Cellulose
Maltose
Glycogen
Starch
Amylopectin
Starch
Amylopectin & amylose are joined to make starch. Cellulose is found in the cell wall of plant cells. Glycogen and maltose are not found in plants.
Example Question #21 : Identification By Structure
Identify the given structure.
L-galactose
D-galactose
L-glucose
D-sucrose
D-glucose
D-galactose
D-galactose is an aldohexose. Aldo indicates the aldehyde at the first carbon 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 pointin to the right in this Fischer projection.
Example Question #22 : Identification By Structure
Identify the given structure.
D-glucose
D-fructose
D-galactose
D-gulose
D-altrose
D-glucose
D-glucose is an aldohexose, one of the most important carbohydrates in biochemistry. Aldo indicates the aldehyde at the first carbon. 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 #23 : Identification By Structure
Identify the given structure.
L-fructose
D-fructose
D-sorbose
D-xyulose
D-tagatose
D-fructose
D-fructose is a ketohexos. Keto indicates the ketone present on carbon 2 and hexose indicates a six-carbon sugar. The D-isomer is determined by the orientation of the highest number asymmetric carbon, which has the hydroxyl group oriented to the right in the Fischer projection.
Example Question #11 : Identifying Specific Carbohydrate Structures
Identify the given structure.
D-gulose
D-allose
D-glucose
D-alrose
D-mannose
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 #15 : Identifying Specific Carbohydrate Structures
Identify the given structure.
D-ribulose
D-glucose
D-mannose
D-ribose
D-sucrose
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 #16 : Identifying Specific Carbohydrate Structures
Identify the given structure.
L-sorbose
D-sorbose
D-glucose
L-fructose
D-fructose
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 #17 : Identifying Specific Carbohydrate Structures
Identify the carbohydrate class of the given molecule.
Aldohexose
Ketohexose
Ketopentose
Ketalhexose
Aldopentose
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 #18 : Identifying Specific Carbohydrate Structures
Identify the carbohydrate class of the given molecule.
Aldohexose
Ketopentose
Aldopentose
Hemiketose
Ketohexose
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 #19 : Identifying Specific Carbohydrate Structures
Identify the carbohydrate class of the given molecule.
Ketohexose
Aldopentose
Ketopentose
Aldoquintos
Aldohexose
Aldopentose
The structure is an aldopentose. Aldo- refers to the aldehyde at the first carbon and pentose refers to a carbohydrate with five carbons.