Biomolecules MCQ's.

Biomolecules

Multiple Choice Questions

  

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1. Which of the following reactions of glucose can be explained only by its cyclic structure?
   1.   Glucose forms penta-acetate.
   2.   Glucose reacts with hydroxylamine to form an oxime.
   3.   Penta-acetate of glucose does not react with hydroxylamine.
   4.   Glucose is oxidized by nitric acid to gluconic acid.
2. A carbohydrate which cannot be hydrolysed to simpler compounds is called
   1.   Monosaccharide
   2.   disaccharide
   3.   trisaccharide
   4.   polysaccharide
3. At what temperature, the β-form of glucose is obtained by crystallization from hot and saturated aqueous solution?
   1.   303 K
   2.   423 K
   3.   371 K
   4.   419 K
4. Which of the following statements is not true about glucose
   1.   It is an aldohexose
   2.   It is present in furanose form
   3.   On heating with HI it forms n-hexane
   4.   It does not give 2, 4-DNP test.
5. The glucose reacts with HCN to form cyanohydrin, what does this reaction confirm
   1.   presence of primary alcoholic group
   2.   five –OH groups attached to different carbon atoms
   3.   all six carbon atoms are linked in a straight chain
   4.   the presence of a carbonyl group in glucose
6. Name the product which is formed by the oxidation of glucose and gluconic acid with nitric acid.
   1.   Rhamnose
   2.   Saccharic acid
   3.   Citric acid
   4.   oxalic acid
7. Name the reagent and condition required for carrying out the following reaction.
   Glucose -> n-hexane
   
   1.   HF, Δ
   2.   HCl, Δ
   3.   HBr, Δ
   4.   HI, Δ
8. How many number of water molecules are removed from the n number of amino acids during the formation of peptide bond?
   1.   (n-1)
   2.   n
   3.   (n/2)
   4.   (n+1)
9. Haemoglobin is a/an
   1.   carbohydrate
   2.   vitamin
   3.   globular protein
   4.   enzyme
10. Which of the following is/are example(s) of denaturation of protein?
    1.   Coagulation of egg white
    2.   Clotting of blood
    3.   Curdling of milk
    4.   Both (a) and (c)
11. Proteins are found to have two different types of secondary structures viz, α-helix and β-pleated sheet structure. α-helix structure of protein is stabilized by
    1.   peptide bonds
    2.   van der waals’ forces
    3.   hydrogen bonds
    4.   dipole-dipole interaction
12. “When the polypeptide chains run parallel are held together by hydrogen and disulphide bonds, then fibre like structure is formed. Such proteins are generally insoluble in water”
    Name the type of protein which satisfy the above information.
    
    1.   Fibrous protein
    2.   Globular protein
    3.   Primary protein
    4.   Tertairy proten
13. Which of the following bases is not present in DNA?
    1.   Adenine
    2.   Thymine
    3.   Cytosine
    4.   Uracil
14. Which of the following is/are the application(s) of the DNA fingerprinting?
    1.   in forensic laboratories for the identification of criminals
    2.   to identify racial groups to rewrite biological evolution
    3.   to determine paternity of an individual
    4.   All of the above
15. α-D-(+)-glucose and β-D-(+)-glucose are
    1.   anomers
    2.   epimers
    3.   enantiomers
    4.   geometrical isomers
16. The bases present in RNA are
    1.   adenine guanine, cytosine, thymine
    2.   guanine, cytosine, thymine, uracil
    3.   cytosine, thymine, adenine, uracil
    4.   adenine, guanine, cytosine, uracil
17. Which of the following treatment will convert starch directly into glucose?
    1.   Heating with dilute NaOH
    2.   Heating with dilute H2SO4
    3.   Fermentation by zymase
    4.   Fermentation by diatase
18. During acetylation of glucose it needs x moles of acetic anhydride. The value of x would be
    1.   3
    2.   4
    3.   5
    4.   1
19. The anomeric carbon n D(+) glucose is
    1.   C-1 carbon
    2.   C-2 carbon
    3.   C-5 carbon
    4.   C-6 carbon
20. How many carbon atoms are there in a pyranose ring?
    1.   3
    2.   6
    3.   5
    4.   7
21. The type of linkage found in polysaccharide is
    1.   Phophodiester linkage
    2.   Peptide linkage
    3.   Glycosidic linkage
    4.   None of the above.
22. The type of linkage found in polynucleotide (Nucleic acid) is
    1.   Phophodiester linkage
    2.   Peptide linkage
    3.   Glycosidic linkage
    4.   None of the above.
23. The type of linkage found in protein is
    1.   Phophodiester linkage
    2.   Peptide linkage
    3.   Glycosidic linkage
    4.   None of the above.
24. The number of amino acids required for protein synthesis is:
    1.   25
    2.   10
    3.   100
    4.   20
25. Nucleic acids are polymers of
    1.   nucleotides
    2.   nucleosides
    3.   bases
    4.   sugars
26. Proteins are condensation polymers of
    1.   β-amino acids
    2.   β-hydroxy acids
    3.   α-amino acids
    4.   α-hydroxy acids
27. A compound which contains both ______ and _____ is called amino acids. The amino acids in polypeptide chain are joined by _____ bonds.
    1.   amino, carboxylic group, ester
    2.   amino, carboxylic group, peptide
    3.   nitrogen, carbon, glycosidic
    4.   hydroxyl, carboxylic group, peptide
28. Globular protein are present in:
    1.   blood
    2.   eggs
    3.   milk
    4.   All of these
29. Denaturation of protein leads to loss of its biological activity by:
    1.   formation of amino acids
    2.   loss of primary structure
    3.   loss of both primary and secondary structure
    4.   loss of both secondary and tertiary structure
30. A nucleoside on hydrolysis gives:
    1.   an aldopentose and a nitrogenous base
    2.   an aldopentose and phosphoric acid
    3.   an aldopentose, a nitrogenous basae and phosphoric acid
    4.   a nitrogenous base and phosphoric acid
31. If one strand of DNA has the sequence ATGCTTGA, the sequence in the complimentary strand would be:
    1.   TCCGAACT
    2.   TACGTAGT
    3.   TACGAACT
    4.   TACGAATC
32. The double strand helix structure of DNA was proposed by by:
    1.   Har Gobind Khurana
    2.   Watson and Crick
    3.   A R Todd
    4.   G W Kenner
33. When adenine is attached to ribose sugar, it is called adenosine. To make a nucleotides from it, would require:
    1.   oxygenation
    2.   addition of a base
    3.   hydrogenation
    4.   addition of phosphate
34. Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between which carbon atoms of pentose sugars of nucleotides are these linkage present?
    1.   3’ and 5’
    2.   5’ and 3’
    3.   5’ and 5’
    4.   3’ and 3’
35. The term anomers of glucose refers to:
    1.   Isomers of glucose that differ in configurations at carbons one and four (C-1 and C-4)
    2.   A mixture of (D)-glucose and (L)-glucose
    3.   Enantiomers of glucose
    4.   Isomers of glucose that differ in configuration at carbon one (C-1)
36. Amino acids have peptide linkage which is:
    1.   -C-NH2
    2.   -SO-NH
    3.   -CO-NH-
    4.   -CO-N-
37. The function of DNA in an organism is:
    1.   To assist in the synthesis of RNA molecule
    2.   To store information of heredity characteristics
    3.   To assist in the synthesis of proteins and polypeptide
    4.   All of the above
38. In DNA, the linkage between different nitrogenous bases are:
    1.   Phosphate linkage
    2.   H-bonding
    3.   Glycosidic linkage
    4.   Peptide linkage
39. The pyridine bases present in DNA are :
    1.   Cytosine and adenine
    2.   Cytosine and guanine
    3.   Cytosine and thymine
    4.   Cytosine and uracil
40. Essential amino acids are those
    1.   which are present in our body
    2.   which cannot be synthesised by our body and needed in our diet
    3.   which are synthesised by our body
    4.   Both a and c