BIOMOLECULES AND ENZYMES

BIOLOGY

CARBOHYDRATES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A carbohydrate that needs to be transformed to glucose in the liver before it can be utilized.
A
galactose
B
fructose
C
sucrose
D
maltose
Explanation: 

Detailed explanation-1: -Entry of Galactose Into Glycolysis Galactose enters glycolysis by its conversion to glucose-1-phosphate (G1P). This occurs through a series of steps that is referred to as the Leloir pathway, named after Luis Federico Leloir who determined the overall process of galactose utilization.

Detailed explanation-2: -Fructose is transported to your liver to be converted to glucose or fat, while glucose can be burned for energy as is anywhere in your body.

Detailed explanation-3: -As an enzyme, -galactosidase cleaves the disaccharide lactose to produce galactose and glucose which then ultimately enter glycolysis. This enzyme also causes transgalactosylation reaction of lactose to allolactose which then finally cleaved to monosaccharides.

Detailed explanation-4: -The enzyme UDP-galactose-4-epimerase (GAL10) catalyzes a key step in galactose metabolism converting UDP-galactose to UDP-glucose which then can get metabolized through glycolysis and TCA cycle thus allowing the cell to use galactose as a carbon and energy source.

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