Biomolecules · JEE Main previous year questions

2019 12 questions

1. Q632019 · 12 Apr 2019 · Shift 1

   Glucose and Galactose are having identical configuration in all the positions except position

   1. A.C–5
   2. B.C–3
   3. C.C–2
   4. D.C–4
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   Answer: D

2. Q662019 · 12 Apr 2019 · Shift 1

   Which of the following statements is not true about RNA?

   1. A.It controls the synthesis of protein
   2. B.It is present in the nucleus of the cell
   3. C.It usually does not replicate
   4. D.It has always double stranded $\alpha$-helix structure
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   Answer: D

3. Q712019 · 12 Apr 2019 · Shift 1

   An ideal gas is allowed to expand from 1 L to 10 L against a constant external pressure of 1 bar. The work done in kJ is :

   1. A.+10.0
   2. B.–0.9
   3. C.– 2.0
   4. D.– 9.0
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   Answer: B

4. Q722019 · 12 Apr 2019 · Shift 2

   Which of the given statements is INCORRECT about glycogen?

   1. A.It is a straight chain polymer similar to amylose
   2. B.It is present in animal cells
   3. C.It is present in some yeast and fungi
   4. D.Only $\alpha$-linkages are present in the molecule
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   Answer: A

5. Q692019 · 10 Apr 2019 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: D

6. Q652019 · 10 Apr 2019 · Shift 2

   Number of stereo centers present in linear and cyclic structures of glucose are respectively :

   1. A.4 & 4
   2. B.4 & 5
   3. C.5 & 4
   4. D.5 & 5
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   Answer: B

7. Q652019 · 9 Apr 2019 · Shift 1

   Which of the following statements is not true about sucrose?

   1. A.The glycosidic linkage is present between ${\mathrm{C}}_1$ of $\alpha$-glucose and ${\mathrm{C}}_1$ of $\beta$-fructose
   2. B.It is also named as invert sugar
   3. C.It is a non reducing sugar
   4. D.On hydrolysis, it produces glucose and fructose
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   Answer: A

8. Q622019 · 9 Apr 2019 · Shift 2

   During compression of a spring the work done is 10kJ and 2kJ escaped to the surroundings as heat. The change in internal energy, $\Delta \mathrm{U}(\mathrm{inkJ})$ is :

   1. A.- 12
   2. B.8
   3. C.- 8
   4. D.12
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   Answer: B

9. Q812019 · 8 Apr 2019 · Shift 2

   Fructose and glucose can be distinguished by :

   1. A.Barfoed's test
   2. B.Fehling's test
   3. C.Seliwanoff's test
   4. D.Benedict's test
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   Answer: C

10. Q752019 · 12 Jan 2019 · Shift 1

    Among the following compounds most basic amino acid is -

    1. A.Lysine
    2. B.Asparagine
    3. C.Histidine
    4. D.Serine
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    Answer: A

11. Q802019 · 12 Jan 2019 · Shift 2

    The correct statement (s) among I to III with respect to potassium ions that are abundant within the cell fluid is /are I. They activate many enzymes II. They participate in the oxidation of glucose to produce ATP III. Along with sodium ions they are responsible for the transmission of nerve signals

    1. A.III only
    2. B.I and II only
    3. C.I and III only
    4. D.I, II and III only
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    Answer: D

12. Q682019 · 9 Jan 2019 · Shift 1

    The increasing order of pka of the following amino acids in aqueous solution is : Gly, Asp, Lys, Arg

    1. A.Asp < Gly < Arg < Lys
    2. B.Gly < Asp < Arg < Lys
    3. C.Asp < Gly < Lys < Arg
    4. D.Arg < Lys < Gly < Asp
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    Answer: C