Which one of the following statements is NOT correct for the classific...
Explanation:
To determine which statement is not correct for the classification of carbohydrates, we need to evaluate each statement individually.
a) Dihydroxyacetone and glyceraldehyde are trioses.
This statement is correct. Dihydroxyacetone and glyceraldehyde are both monosaccharides with three carbon atoms, making them trioses.
b) Gulose and arabinose are pentoses.
This statement is incorrect. Gulose and arabinose are both monosaccharides with five carbon atoms, making them pentoses. Therefore, this statement is incorrect.
c) Tagatose and fructose are ketohexoses.
This statement is correct. Tagatose and fructose are both monosaccharides with six carbon atoms and contain a ketone functional group, making them ketohexoses.
d) Erythose and threose are tetroses.
This statement is correct. Erythose and threose are both monosaccharides with four carbon atoms, making them tetroses.
Conclusion:
Among the given statements, statement b) "Gulose and arabinose are pentoses" is not correct for the classification of carbohydrates. Gulose and arabinose are actually pentoses, not hexoses.