Recent questions tagged unit14

starch can be used as an indicator for the detection of traces of

asked Mar 26, 2014 by sreemathi.v

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Carbohydrate without asymmetric carbon atom is

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A polysaccharide that give only glucose when completely hydrolysed.

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$(C_4H_{10}O_5)_n + nH_2O → C_{12}H_{22}O_{11} + H_2O → 2C_6H_{12}O_6$ What are the enzymes used in above conversion of Cellulose to Maltose to Glucose respectively ?

asked Mar 26, 2014 by sreemathi.v

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Calculate how much of the $\alpha$ and $\beta$ anomers of glucose are present in equlibrium mixture with a specific rotation of 52.6 degrees. (pure $\alpha$ D- glucose has specific rotation = + 112.2 degrees and that of $\beta$- D-glucose has specific rotation + 19 degrees)

asked Mar 26, 2014 by sreemathi.v

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The $\beta$ and $\alpha$ - D- glucose have different specific rotations. When either anomer is dissolved in water, their rotation change until the same fixed value results. What term is used for these changes?

asked Mar 26, 2014 by sreemathi.v

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$\begin{array}{1 1}\text{statement 1- D Glucopyranose is a non-reducing sugar}\\\text{statement 2- Six membered pyranose ring is always in equalibrium with its open chain counterpart}\end{array}$

asked Mar 26, 2014 by sreemathi.v

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If sucrose is treated with concentrated sulphuric acid, the product formed is

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Starch is converted into maltose by the

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The reagent which forms crystalline osazone derivative when reacted with glucose, is

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Glucose has difference from fructose in that it.

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Cellulose on hydrolysis with dilute sulphuric acid,gives

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Treatment of (+)- glucose with $HIO_4$ gives the results that confirm its aldohexose structure. How many moles of $HIO_4$ should be consumed?

asked Mar 26, 2014 by sreemathi.v

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Fructose reduces Tollen’s reagent due to

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An electric current is passed though an aqueous solution of a mixture of alanine (isoelectric point 6.0),glutamic acid (3.2) and arginine (10.7) buffered at pH 6. What will happen to the three amino acids?

asked Mar 26, 2014 by sreemathi.v

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$p - Cl - C_6H_4NH_2$ and $PhNH_36 + Cl^−$ can be distinguished by

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How can lysine and glycine be separated from each other?The isoelectric points are pH 9.6 for lysine and pH 5.97 for glycine

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Amino acids constitute one of the important class of organic compounds.These are

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The structure of glycine at pH 6 is (isoelectric point = 6)

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What happens when electrolysis of alpha amino acid is done at isoelectric point?

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Isoelectric point is:

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Why Glycine exist as $(H_3N+CH_2COO^−)$ while antranilic acid ($p − NH_2 − C_6H_4 − COOH)$ does not exist as dipolar ion ?

asked Mar 26, 2014 by sreemathi.v

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Non-essential amino acids are

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Essential amino acids are

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Glucose reacts with phenylhydrazine to form

asked Mar 18, 2014 by yamini.v

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Which of the following natural sugar is the sweetest ?

asked Mar 18, 2014 by yamini.v

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Proteins $\large\xrightarrow {Hydrolysis}$ $A$ $\large\xrightarrow {Hydrolysis}$ $\alpha-$ Aminoacids

asked Mar 18, 2014 by yamini.v

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Which enzyme helps in the formation of Maltose from starch ?

asked Mar 18, 2014 by yamini.v

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The catalyst required for acetylation of glucose is

asked Mar 18, 2014 by yamini.v

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Which of the following is D(+) glyceraldehyde ?

asked Mar 18, 2014 by yamini.v

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All monosaccharides ----------- Tollen's reagent .

asked Mar 16, 2014 by yamini.v

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The human body does not produce

asked Mar 16, 2014 by yamini.v

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Which base is present in RNA but met in DNA ?

asked Mar 16, 2014 by yamini.v

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Oils and fats are together called

asked Mar 16, 2014 by yamini.v

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Which of the following is not a function of proteins ?

asked Mar 16, 2014 by yamini.v

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An example of water soluble vitamin is

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$\alpha\;$ - D (+) glucose and $\;\beta\;$ - D (+) glucose are

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Which of the following has magnesium ?

asked Mar 16, 2014 by yamini.v

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Vitamin $\;B_{1}\;$ is

asked Mar 16, 2014 by yamini.v

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A peptide having molecular mass more than 10,000 u is called a

asked Mar 16, 2014 by yamini.v

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PH at which there is no net charge is called

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Which of the following is a neutral amino acid ?

asked Mar 15, 2014 by yamini.v

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Starch is a polymer of

asked Mar 15, 2014 by yamini.v

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Which of the following is about 2000 times sweeter sucrose ?

asked Mar 15, 2014 by yamini.v

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Which of the following is Non - reducing sugar ?

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In sucrose two monosaccharide units are linked to each other by a bond called

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Which enzyme help in fermentation of D-glucose ?

asked Mar 15, 2014 by yamini.v

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Glucose does not give characteristic reactions of

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The number of optical isomers glucose is ?

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Which one of the following is the class of glyceraldehyde ?

asked Mar 15, 2014 by yamini.v

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