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12th Standard Chemistry Biomolecules English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

12th Standard EM

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20
    Answer all the questions
    20 x 1 = 20
  1. The correct corresponding order of names of four aldoses with configuration given below Respectively is,

    (a)

    L-Erythrose, L-Threose, L-Erythrose, D-Threose

    (b)

    D-Threose,D-Erythrose, L-Threose, L-Erythrose,

    (c)

    L-Erythrose, L-Threose, D-Erythrose, D-Threose

    (d)

    D-Erythrose, D-Threose, L-Erythrose, L-Threose

  2. Glucose(HCN) Product (hydrolysis) Product (HI + Heat) A, the compound A is

    (a)

    Heptanoic acid

    (b)

    2-Iodohexane

    (c)

    Heptane

    (d)

    Heptanol

  3. Among the following the achiral amino acid is

    (a)

    2-ethylalanine

    (b)

    2-methylglycine

    (c)

    2-hydroxymethylserine

    (d)

    Tryptophan

  4. In aqueous solution of amino acids mostly exists in,

    (a)

    NH2-CH(R)-COOH

    (b)

    NH2-CH(R)-COO-

    (c)

    H3N+-CH(R)-COOH

    (d)

    H3N+-CH(R)-COO-

  5. The pyrimidine bases present in DNA are

    (a)

    Cytosine and Adenine

    (b)

    Cytosine and Guanine

    (c)

    Cytosine and Thiamine

    (d)

    Cytosine and Uracil

  6. Complete hydrolysis of cellulose gives

    (a)

    L-Glucose

    (b)

    D-Fructose

    (c)

    D-Ribose

    (d)

    D-Glucose

  7. Insulin, a hormone chemically is

    (a)

    Fat

    (b)

    Steroid

    (c)

    Protein

    (d)

    Carbohydrates

  8. Which of the following are epimers

    (a)

    D(+)-Glucose and D(+)-Galactose

    (b)

    D(+)-Glucose and D(+)-Mannose

    (c)

    Neither (a) nor (b)

    (d)

    Both (a) and (b)

  9. Disaccharides have general formula

    (a)

    Cn(H2O)n

    (b)

    (CO2)n n,

    (c)

    Cn(H2O)n-1

    (d)

    Cn(H2O)2n-l

  10. Sucrose is not

    (a)

    a di-saccharide

    (b)

    a non-reducing sugar

    (c)

    hydrolysed to only glucose

    (d)

    hydrolysed to glucose & fructose

  11. Glucose is not oxidised to gluconic acid by

    (a)

    Br2/H2O

    (b)

    Fehling's solution

    (c)

    Tollen's reagent

    (d)

    Conc. HNO3

  12. Which is not true of amino acid?

    (a)

    amino acid forms zwitter ion

    (b)

    has isoelectric point

    (c)

    dual behaviours

    (d)

    amino acid is insoluble in NaOH solution

  13. Ultimate products of hydrolysis of proteins is

    (a)

    aniline

    (b)

    aliphatic acid

    (c)

    amino acid

    (d)

    aromatic acid

  14. Hair and nail contains

    (a)

    cellulose

    (b)

    fat

    (c)

    keratin

    (d)

    lipid

  15. The oxide bridges through which a large number of monosaccharide units are linked in polysaccharides are called

    (a)

    peptide bond

    (b)

    hydrogen bond

    (c)

    nitrogen bond

    (d)

    glycosidic linkage

  16. Sugars that yield two to ten monosaccharide molecules on hydrolysis is

    (a)

    monosaccharides

    (b)

    disaccharides

    (c)

    oligosaccharides

    (d)

    polysaccharides

  17. Fructose is not oxidised by bromine water indicates

    (a)

    the presence of aldehydic group

    (b)

    presence of ketonic group

    (c)

    absence of aldehydic group

    (d)

    absence of ketonic group

  18. An example for reducing disaccharide is

    (a)

    glucose

    (b)

    fructose

    (c)

    sucrose

    (d)

    lactose

  19. On hydrolysis, which one of the following disaccharide will give a ketose and an aldose?

    (a)

    Maltose

    (b)

    Sucrose

    (c)

    Lactose

    (d)

    All the above

  20. An example of non-protein amino acid is

    (a)

    Alanine

    (b)

    orinithine

    (c)

    proline

    (d)

    serine

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