Multiple Choice
Which element is considered the backbone of a sugar molecule?
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1. Introduction to Biochemistry
Carbohydrates
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Which of the following statements regarding glucose is correct?
A
Glucose cannot form cyclic structures in aqueous solution.
B
Glucose is an aldohexose with the molecular formula C_6H_{12}O_6.
C
Glucose is a ketopentose commonly found in nucleic acids.
D
Glucose is a non-reducing sugar.
Verified step by step guidance1
Step 1: Begin by analyzing the molecular formula of glucose, C₆H₁₂O₆. This formula indicates that glucose is a hexose sugar, meaning it contains six carbon atoms.
Step 2: Understand the functional group present in glucose. Glucose contains an aldehyde group (-CHO) at the first carbon, making it an aldohexose. This distinguishes it from ketoses, which have a ketone group.
Step 3: Recall that glucose can form cyclic structures in aqueous solutions. The aldehyde group reacts with the hydroxyl group on the fifth carbon to form a hemiacetal, resulting in a cyclic structure (either α-glucose or β-glucose). This contradicts the statement that glucose cannot form cyclic structures.
Step 4: Evaluate the reducing properties of glucose. Glucose is a reducing sugar because its aldehyde group can be oxidized, allowing it to reduce other compounds. This disproves the statement that glucose is a non-reducing sugar.
Step 5: Eliminate incorrect options based on the above analysis. The correct statement is: 'Glucose is an aldohexose with the molecular formula C₆H₁₂O₆.'
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