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21) Which is NOT the correct description about macro-molecules?a) All monosaccharides are reducing sugars.b) Glycogen is one polysaccharides used to store energy in humans.c) All free amino acids have a peptide bond.d) Lipids are soluble in non-polar solvents.e) Honey solution cannot show grease-spot on unglazed paper.

User Didiz
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The correct option is a) All monosaccharides are reducing sugars. Ony sugars with specific chemical groups (hemiacetals) are reducing sugars.

User Dave Gamble
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