Biochemistry : Identifying Biochemical Molecules
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Example Questions
Example Question #3 : Identifying Specific Carbohydrate Structures
Glucose and galactose share a chemical formula and are known as epimers.
What is the difference between glucose and galactose?
Galactose is a ketose
Glucose is bigger than galactose
Galactose is spread further apart than glucose
They differ in configuration around the fourth carbon
They differ in configuration around the fourth carbon
As a pair of epimers, this means that both glucose and galactose are the same in configuration in all carbons except for one non-carbonyl carbon. To differ in the configuration of the carbonyl carbon makes an anomer not an epimer. Both glucose and galactose are aldoses.
Example Question #1 : Identifying Specific Carbohydrate Structures
The following are the common substrates, enzymes and the associated products.
Although cellulose provides the same carbohydrates as maltose, it cannot be broken down by humans. What type of linkage prevents humans from breaking down the polysaccharide?
Alpha-1,4 glycosidic bond
Beta-1,4 glycosidic bond
None of these
Beta-1,6 glycosidic bond
Alpha-1,6 glycosidic bond
Beta-1,4 glycosidic bond
The beta-1,4 glycosidic bond is not a substrate for any human enzymes, and is thus left untreated.
Example Question #4 : Identifying Specific Carbohydrate Structures
Which of the following enzymes is correctly paired with its products and substrates?
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 #5 : Identifying Specific Carbohydrate Structures
Which of the following enzymes is correctly paired with its products and substrates?
An easy way to distinguish the substrate nd 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 #6 : Identifying Specific Carbohydrate Structures
Which of the following enzymes is correctly paired with its products and substrates?
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 #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 #71 : Identifying Biochemical Molecules
Identify the given structure.
L-glucose
D-galactose
D-sucrose
D-glucose
L-galactose
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 #72 : Identifying Biochemical Molecules
Identify the given structure.
D-fructose
D-glucose
D-altrose
D-gulose
D-galactose
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 #73 : Identifying Biochemical Molecules
Identify the given structure.
D-tagatose
D-xyulose
D-sorbose
L-fructose
D-fructose
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.
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