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Because, lactase breaks beta(1-4) glycosidic bonds between a galactose and a glucose, while sucrose molecule is formed by a dimer of a glucose and a fructose linked by an alpha(1-2) glycosidic bond.
Wiki User
∙ 7y ago
Wiki User
∙ 9y agoFehling's test is used as a general test for monosaccharides. Lactose is a polysaccharide and sucrose is a monosaccharide, resulting in a positive Fehlings test.
Wiki User
∙ 11y agoLactase. This is due to enzyme-substrate specificity. The active site of lactase fits lactose but not sucrose.
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The chemical elements in a non reducing sugar?
frictose glucose lactose
How many different types of substrates can an enzyme react with?
Usually only one, protein enzymes tend to be very specific.
What effect do acidic and basic solutions have on enzyme moleculues?
pH - denatures the enzyme by altering the charges on the enzyme. This will affect the structure of the enzyme and its ability to function. Heat - will denature the enzyme by breaking its bonds. This will stop the enzyme from being able to bond to a specific substrate molecule. Cold - not enough energy to reach minimum amount of activation energy needed to undergo reaction. The enzyme will not be able to react on the substrate.
The graph below shows how two different enzymes react with a substrate as the temperature increases. Based on the results what conclusion can be drawn about the action of the enzymes as?
Enzyme A reacts with less substrate than B. [APEX]
Can Seliwanoff's test be used to distinguish sucrose from fructose?
Yes, fructose is a ketose, for which Seliwanoff's test is most sensitive. Sucrose is neither entirely a ketose nor an aldose, but is a mixture of both. It will react, but more slowly, producing a much lighter pinkish color.
Why did the enzyme react to lactose but not to sucrose?
the enzyme is not the right shape for sucrose
What is difference between lactic acid and lactose?
If we are talking about distinguishing between the two solutions then, Carry out a Benedict's test on both solutions; Results: Lactose solution would give a brick-red/brown precipitate (positive test) Sucrose solution would give negative test result while sucrose is a non-reducing sugar which does not react with Benedict's reagent.
What are two different ways by which hydrolysis can be brought about?
Hydrolysis can be brought about by adding water to a compound and allowing it to react, or by using an enzyme as a catalyst to speed up the hydrolytic reaction.
Which of the disaccharide will not react with benedict's solution?
Sucrose will not react with Benedict's solution. This is because sucrose is a non-reducing sugar, meaning it does not have a free aldehyde or ketone group that can be oxidized by Benedict's reagent.
What carbohydrate does not react with Iodine or Benedict's solution?
Sucrose
A gene cannot react chemically and form a trait without the proper?
enzyme
Does enzyme affect jello?
*Do enzymes react with jello?
How would lactose react toward barford test?
Theoretically nothing is happend
What sugars do baker's yeast react with?
fructose, sucrose, glucose, manndose, raffinose, and maltose
Why when adding catalase to sucrose not makes it bubble?
Catalase is an enzyme that is substrate-specific, meaning that it has a particular reaction that it will catalyze (to speed up a reaction). Hydrogen peroxide (H2O2) is the specific substrate reactant with which catalase will react (in a degradation reaction). This is the degradation (breaking down of) reaction. 2H2O2 yields 2H2O+O2 O2 is oxygen which is indicated by the rising of bubbles upon reaction between the hydrogen peroxide and the catalase. Sucrose is not the specific substrate assigned to the catalase enzyme, therefore they will not react together in a degradation reaction, hence the lack of oxygen release (lack of bubbles). I hope this was helpful to you. God bless and Jesus loves you.
What is the substrate of an enzyme?
One of the multiple compound used as reactants, that the enzyme makes react faster thatn they normally would
The chemical elements in a non reducing sugar?
frictose glucose lactose
