why do all sugar containing materials not show a positive test for sugar??

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why do all sugar containing materials not show a positive test for sugar??

2007-01-27 12:31:35 · 3 answers · asked by >() 1 in Science & Mathematics ➔ Biology

3 answers

There are many different tests used to detect sugars...some test for 'reducing' sugars (Benedict's test) while others test for one sugar typelike starch (iodine test).

A substance can contain a sugar but it many be chemically bonded to another molecule in such a way that one particular test doesn't 'see' it. For example, DNA contains a sugar (deoxyribose) but this sugar is linked to a phosphate group and a nitrogen base...most sugar tests will not react with this sugar because it is covalently bonded to non-sugar molecules.

2007-01-27 14:28:37 · answer #1 · answered by teachbio 5 · 0⤊ 1⤋

2016-05-20 18:08:47 · answer #2 · answered by Dwayne 3 · 0⤊ 0⤋

maybe you are testing it correctly

2007-01-27 13:09:18 · answer #3 · answered by Anonymous · 0⤊ 0⤋