All Biochemistry Resources
Example Questions
Example Question #7 : Identifying Specific Carbohydrate Structures
Which of the following enzymes is correctly paired with its products and substrates?
All of these
An easy way to distinguish the substrate and the product from the enzyme is that the enzyme will end in "ase". The following are the common substrates, enzymes and the associated products.
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.