Biochemistry
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'Which of the following statements best characterize glucose?
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It usually exists in the furanose form
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It is a ketose
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It forms part of the disaccharide sucrose
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Only the L-isomer can be transported into mammalian cells
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About This Quiz
Covers chemical stucture of biomoleculesmajor biomolecules are carbohydrates, lipids, proteins and nucleic acids
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- 2.
As a rule, the number of isomers that a sugar has depends on
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the number of chiral carbons
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the kind of substituents
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the number of alcohol groups present
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its anomeric carbon
Correct Answer
A. the number of chiral carbonsExplanation
the number of isomers is equal to the square of the number of chiral or assymetric carbon atoms (n raised to 2nd power). Thus glucose has 4 chiral carbons; its isomers total 16 (4 raised to the power 2).Rate this question:
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- 3.
The simplest of the hydrated carbons, with the formula (CH2O1) is called
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dihydroxyacetone
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formaldehyde
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pyranose
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Glyceraldehyde
Correct Answer
A. GlyceraldehydeExplanation
glyceraldehyde fulfills the definition of carbohydrate: "polyhydroxyaldehydes or ketones". It has an aldehyde (-CHO) and 2 (i.e. poly) hydroxyl (-0H) groups.Rate this question:
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- 4.
All of the following are composed exclusively of glucose, EXCEPT:
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amylose
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lactose
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cellulose
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Maltose
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glycogen
Correct Answer
A. lactoseExplanation
lactose is made up of glucose + galactose; all the others are made up of glucose onlyRate this question:
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Current Version
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Mar 21, 2022Quiz Edited by
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Apr 07, 2009Quiz Created by
Manmacsr
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