Biomolecules · JEE Main previous year questions

2022 19 questions

1. Q872022 · 29 Jul 2022 · Shift 1· Numerical answer

   In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) $-$ (number of peptide bonds) is __________.

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   Answer: 1

2. Q732022 · 29 Jul 2022 · Shift 2

   Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Amylose is insoluble in water. Reason R: Amylose is a long linear molecule with more than 200 glucose units. In the light of the above statements, choose the correct answer from the options given below.

   1. A.Both $\mathbf{A}$ and $\mathbf{R}$ are correct and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$.
   2. B.Both $\mathbf{A}$ and $\mathbf{R}$ are correct but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$.
   3. C.$\mathbf{A}$ is correct but $\mathbf{R}$ is not correct
   4. D.$\mathbf{A}$ is not correct but $\mathbf{R}$ is correct.
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   Answer: D

3. Q742022 · 28 Jul 2022 · Shift 1

   Match List - I with List - II. | | List - I Reaction | | List - II Catalyst | |---|---|---|---| | (A) | $4N{H}_3(g)+5O_2(g)\to 4NO(g)+6H_{2}O(g)$ | (I) | $NO(g)$ | | (B) | $N_2(g)+3H_2(g)\to 2N{H}_3(g)$ | (II) | $H_{2}S{O}_4(l)$ | | (C) | $C_{12}{H}_{22}{O}_{11}(aq)+H_{2}O(l)\to \underset{Glucose}{C_6{H}_{12}{O}_6}+\underset{Fructose}{C_6{H}_{12}{O}_6}$ | (III) | $Pt(s)$ | | (D) | $2S{O}_2(g)+O_2(g)\to 2S{O}_3(g)$ | (IV) | $Fe(s)$ | Choose the correct answer from the options given below :

   1. A.(A) - (II), (B) - (III), (C) - (I), (D) - (IV)
   2. B.(A) - (III), (B) - (II), (C) - (I), (D) - (IV)
   3. C.(A) - (III), (B) - (IV), (C) - (II), (D) - (I)
   4. D.(A) - (III), (B) - (II), (C) - (IV), (D) - (I)
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   Answer: C

4. Q722022 · 28 Jul 2022 · Shift 2

   The formulas of $\mathrm{A}$ and $\mathrm{B}$ for the following reaction sequence $$\text{Fructose}\begin{array}{l}\underset{{\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\mathrm{HCN}}{\to }}\mathrm{A}\\ \underset{\text{(ii) }HI/P}{\overset{\text{(i) }\mathrm{NaB}{\mathrm{H}}_4}{\to }}\mathrm{B}\end{array}$$ are

   1. A.$\mathrm{A}={\mathrm{C}}_7{\mathrm{H}}_{14}{\mathrm{O}}_8$, $\mathrm{B}={\mathrm{C}}_6{\mathrm{H}}_{14}$
   2. B.$\mathrm{A}={\mathrm{C}}_7{\mathrm{H}}_{13}{\mathrm{O}}_7$, $\mathrm{B}={\mathrm{C}}_7{\mathrm{H}}_{14}\mathrm{O}$
   3. C.$\mathrm{A}={\mathrm{C}}_7{\mathrm{H}}_{12}{\mathrm{O}}_8$, $\mathrm{B}={\mathrm{C}}_6{\mathrm{H}}_{14}$
   4. D.$\mathrm{A}={\mathrm{C}}_7{\mathrm{H}}_{14}{\mathrm{O}}_8$, $\mathrm{B}={\mathrm{C}}_6{\mathrm{H}}_{14}{\mathrm{O}}_6$
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   Answer: A

5. Q872022 · 28 Jul 2022 · Shift 2· Numerical answer

   Among the following the number of state variables is ______________. Internal energy (U) Volume (V) Heat (q) Enthalpy (H)

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   Answer: 3

6. Q612022 · 27 Jul 2022 · Shift 1

   $250\text{ g}$ solution of D-glucose in water contains $10.8\%$ of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are, H, 1 u; C, 12 u; O, 16 u)

   1. A.1.03
   2. B.2.06
   3. C.3.09
   4. D.5.40
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   Answer: B

7. Q842022 · 27 Jul 2022 · Shift 1· Numerical answer

   The molar heat capacity for an ideal gas at constant pressure is $20.785{\text{ J K}}^{-1}{\text{ mol}}^{-1}$. The change in internal energy is $5000\text{ J}$ upon heating it from $300\text{ K}$ to $500\text{ K}$. The number of moles of the gas at constant volume is _________. [Nearest integer] (Given: $\mathrm{R}=8.314{\text{ J K}}^{-1}{\text{ mol}}^{-1}$)

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   Answer: 2

8. Q722022 · 27 Jul 2022 · Shift 2

   Match List - I with Match List - II. $$\begin{array}{llll}& \text{List - I}& & \text{List - II}\\ \text{(A)}& \text{Glucose + HI}& \text{(I)}& \text{Gluconic acid}\\ \text{(B)}& \text{Glucose + }\mathrm{B}{\mathrm{r}}_2\text{ water}& \text{(II)}& \text{Glucose pentacetate}\\ \text{(C)}& \text{Glucose + acetic anhydride}& \text{(III)}& \text{Saccharic acid}\\ \text{(D)}& \text{Glucose + }\mathrm{HN}{\mathrm{O}}_3& \text{(IV)}& \text{Hexane}\end{array}$$ Choose the correct answer from the options given below:

   1. A.(A) - (IV), (B) - (I), (C) -(II), (D) - (III)
   2. B.(A) - (IV), (B) - (III), (C) -(II), (D) - (I)
   3. C.(A) - (III), (B) - (I), (C) -(IV), (D) - (II)
   4. D.(A) - (I), (B) - (III), (C) -(IV), (D) - (II)
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   Answer: A

9. Q722022 · 25 Jul 2022 · Shift 2

   Glycosidic linkage between ${\mathrm{C}}_1$ of $\alpha$-glucose and ${\mathrm{C}}_2$ of $\beta$-fructose is found in

   1. A.maltose
   2. B.sucrose
   3. C.lactose
   4. D.amylose
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   Answer: B

10. Q732022 · 30 Jun 2022 · Shift 1

    The sugar produced after complete hydrolysis of DNA is

    1. A.a pentose sugar.
    2. B.a hexose sugar.
    3. C.a polysaccharide.
    4. D.a disaccharide.
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    Answer: A

11. Q812022 · 28 Jun 2022 · Shift 2· Numerical answer

    For combustion of one mole of magnesium in an open container at $300\mathrm{K}$ and $1\mathrm{bar}$ pressure, ${\Delta }_{\mathrm{c}}{\mathrm{H}}^{\mathrm{\Theta }}=-601.70\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$, the magnitude of change in internal energy for the reaction is ____ $\mathrm{kJ}$. (Nearest integer) (Given : $\mathrm{R}=8.3\mathrm{J}{\mathrm{K}}^{-1}\mathrm{mo}{\mathrm{l}}^{-1}$)

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    Answer: 600

12. Q732022 · 27 Jun 2022 · Shift 2

    Given below are two statements. Statement I : Maltose has two $\alpha$-D-glucose units linked at ${\text{C}}_1$ and ${\text{C}}_4$ and is a reducing sugar. Statement II : Maltose has two monosaccharides : $\alpha$-D-glucose and $\beta$-D-glucose linked at ${\text{C}}_1$ and ${\text{C}}_6$ and it is a non-reducing sugar. In the light of the above statements, choose the correct answer from the options given below :

    1. A.Both Statement I and Statement II are true.
    2. B.Both Statement I and Statement II are false.
    3. C.Statement I is true but Statement II is false.
    4. D.Statement I is false but Statement II is true.
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    Answer: C

13. Q892022 · 26 Jun 2022 · Shift 1· Numerical answer

    The number of oxygens present in a nucleotide formed from a base, that is present only in RNA is ___________.

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    Answer: 9

14. Q622022 · 26 Jun 2022 · Shift 2

    Match List-I with List-II | List - I Enzyme | List - II Conversion of | |---|---| | A. Invertase | I. Starch into maltose | | B. Zymase | II. Maltose into glucose | | C. Diastase | III. Glucose into ethanol | | D. Maltase | IV. Cane sugar into glucose | Choose the most appropriate answer from the options given below :

    1. A.A-III, B-IV, C-II, D-I
    2. B.A-III, B-II, C-I, D-IV
    3. C.A-IV, B-III, C-I, D-II
    4. D.A-IV, B-II, C-III, D-I
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    Answer: C

15. Q752022 · 26 Jun 2022 · Shift 2

    Which one of the following is a water soluble vitamin, that is not excreted easily?

    1. A.Vitamin ${\mathrm{B}}_2$
    2. B.Vitamin ${\mathrm{B}}_1$
    3. C.Vitamin ${\mathrm{B}}_6$
    4. D.Vitamin ${\mathrm{B}}_{12}$
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    Answer: D

16. Q832022 · 26 Jun 2022 · Shift 2· Numerical answer

    A fish swimming in water body when taken out from the water body is covered with a film of water of weight $36\mathrm{g}$. When it is subjected to cooking at $100^{\circ }\mathrm{C}$, then the internal energy for vaporization in $\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ is ____. [nearest integer] [Assume steam to be an ideal gas. Given ${\Delta }_{\mathrm{vap}}{\mathrm{H}}^{\ominus }$ for water at $373\mathrm{K}$ and $1\mathrm{bar}$ is $41.1\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ ; $\mathrm{R}=8.31\mathrm{J}{\mathrm{K}}^{-1}\mathrm{mo}{\mathrm{l}}^{-1}$]

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    Answer: 38

17. Q812022 · 25 Jun 2022 · Shift 2· Numerical answer

    A protein 'A' contains $0.30\%$ of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is ____ $\times 10^3\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ [nearest integer]

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    Answer: 25

18. Q862022 · 25 Jun 2022 · Shift 2· Numerical answer

    How many of the given compounds will give a positive Biuret test ____________ ? Glycine, Glycylalanine, Tripeptide, Biuret

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    Answer: 2

19. Q872022 · 24 Jun 2022 · Shift 2· Numerical answer

    In alanylglycyl leucyl alanyl valine, the number of peptide linkages is ___________.

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    Answer: 4