Why glucose, maltose, and starch negative for Seliwanoff's test while sucrose and fructose is positive. Can you give me a detailed answer aside from it's change of color. Thank you.

Md Ariful Islam

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Md Ariful Islam

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As starch is a polysaccharide, it is unsurprising that the starch solution tested negative for simple sugars. This is because HCl breaks starch back down into its component monosaccharides (glucose, in this case). Amylase is an enzyme that removes glucose molecules from starch.

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A student stated: <ul><li>The rates of respiration with glucose maltose and sucrose were very similar.</li><li>The yeast could not hydrolyse diasaccharides.</li></ul>Evaluate the students statements.

Sucrose and maltose are disaccharides. If both maltose and sucrose are used by yeasts during respiration, it does not indicate that yeasts do not hydrolyse disaccharides. Other control (i.e., glucose...

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Iodine solution passes through the cellulose bag due to diffusion. For osmosis, it is necessary to overcome a semipermeable membrane. Сellulose is not such a membrane.

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Calculate the molality of a sucrose solution made by dissolving 67.9 grams sucrose into 94.9 grams water. The molar mass of sucrose is 342.2 g/mol.

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There are no corresponding enzymes.

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Analyze the molecular formula of fructose. What is the summation of the number of atoms present in fructose? NOTE: WRITE YOUR ANSWER AS A FIGURE WITH NO UNITS/LETTERS ATTACHED TO IT.

C12 H 22 O11No. of elements=45No. of atoms=(6.022*1023)*(45)=270.99*1023

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RCHO + 2Cu2+ -&gt; RCOOH + CuO +4H

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Why does the Lugol’s test (iodine test) give dark blue color of amylase- starch mixture after boiling of this mixture?

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