Biomolecules · JEE Main previous year questions

2023 18 questions

1. Q662023 · 13 Apr 2023 · Shift 2

   The naturally occurring amino acid that contains only one basic functional group in its chemical structure is

   1. A.asparagine
   2. B.arginine
   3. C.histidine
   4. D.lysine
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   Answer: A

2. Q822023 · 11 Apr 2023 · Shift 1· Numerical answer

   $0.004\text{ M }{\mathrm{K}}_2\mathrm{S}{\mathrm{O}}_4$ solution is isotonic with $0.01\text{ M}$ glucose solution. Percentage dissociation of ${\mathrm{K}}_2\mathrm{S}{\mathrm{O}}_4$ is _________ (Nearest integer)

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   Answer: 75

3. Q672023 · 11 Apr 2023 · Shift 2

   What weight of glucose must be dissolved in $100\text{ g}$ of water to lower the vapour pressure by $0.20\text{ mm Hg}$ ? (Assume dilute solution is being formed) Given : Vapour pressure of pure water is $54.2\text{ mm Hg}$ at room temperature. Molar mass of glucose is $180{\text{ g mol}}^{-1}$

   1. A.$3.69\text{ g}$
   2. B.$2.59\text{ g}$
   3. C.$3.59\text{ g}$
   4. D.$4.69\text{ g}$
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   Answer: A

4. Q842023 · 11 Apr 2023 · Shift 2· Numerical answer

   Number of compounds from the following which will not produce orange red precipitate with Benedict solution is ___________. Glucose, maltose, sucrose, ribose, 2-deoxyribose, amylose, lactose

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   Answer: 2

5. Q632023 · 10 Apr 2023 · Shift 1

   The one that does not stabilize $2^{\circ }$ and $3^{\circ }$ structures of proteins is

   1. A.$-\text{O}-\text{O}-\text{linkage}$
   2. B.$-\text{S}-\text{S}-\text{linkage}$
   3. C.van der Waals forces
   4. D.H-bonding
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   Answer: A

6. Q712023 · 8 Apr 2023 · Shift 1

   Sulphur (S) containing amino acids from the following are: (a) isoleucine (b) cysteine (c) lysine (d) methionine (e) glutamic acid

   1. A.b, d
   2. B.a, d
   3. C.b, c, e
   4. D.a, b, c
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   Answer: A

7. Q702023 · 6 Apr 2023 · Shift 1

   Match List I with List II | LIST I (Enzymatic reaction) | LIST II (Enzyme) | | :--- | :--- | | A. Sucrose $\to$ Glucose and Fructose | I. Zymase | | B. Glucose $\to$ ethyl alcohol and ${\text{CO}}_2$ | II. Pepsin | | C. Starch $\to$ Maltose | III. Invertase | | D. Proteins $\to$ Amino acids | IV. Diastase | Choose the correct answer from the options given below:

   1. A.A-III, B-I, C-II, D-IV
   2. B.A-III, B-I, C-IV, D-II
   3. C.A-I, B-IV, C-III, D-II
   4. D.A-I, B-II, C-IV, D-III
   Show answer

   Answer: B

8. Q732023 · 6 Apr 2023 · Shift 2

   Match List I with List II $$\begin{array}{llll}& \text{LIST I (Natural Amino Acid)}& & \text{LIST II (One Letter Code)}\\ \text{A.}& \text{Arginine}& \text{I.}& \text{D}\\ \text{B.}& \text{Aspartic acid}& \text{II.}& \text{N}\\ \text{C.}& \text{Asparagine}& \text{III.}& \text{A}\\ \text{D.}& \text{Alanine}& \text{IV.}& \text{R}\end{array}$$ Choose the correct answer from the options given below:

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

9. Q692023 · 31 Jan 2023 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: C

10. Q842023 · 30 Jan 2023 · Shift 1· Numerical answer

    When 2 litre of ideal gas expands isothermally into vacuum to a total volume of 6 litre, the change in internal energy is ____________ J. (Nearest integer)

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    Answer: 0

11. Q662023 · 29 Jan 2023 · Shift 1

    Number of cyclic tripeptides formed with 2 amino acids A and B is :

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

12. Q702023 · 29 Jan 2023 · Shift 2
    
    1. A.YQLF
    2. B.FIQY
    3. C.PLDY
    4. D.FLDY
    Show answer

    Answer: D

13. Q802023 · 25 Jan 2023 · Shift 1

    A cubic solid is made up of two elements X and Y. Atoms of X are present on every alternate corner and one at the center of cube. Y is at ${\frac{1}{3}}^{\mathrm{rd}}$ of the total faces. The empirical formula of the compound is :

    1. A.${\mathrm{X}}_2{\mathrm{Y}}_{1.5}$
    2. B.${\mathrm{X}}_3{\mathrm{Y}}_2$
    3. C.$\mathrm{X}{\mathrm{Y}}_{2.5}$
    4. D.${\mathrm{X}}_{2.5}\mathrm{Y}$
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    Answer: B

14. Q862023 · 25 Jan 2023 · Shift 1· Numerical answer

    An athlete is given 100 g of glucose $({\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6)$ for energy. This is equivalent to 1800kJ of energy. The 50% of this energy gained is utilized by the athlete for sports activities at the event. In order to avoid storage of energy, the weight of extra water he would need to perspire is ____ g (Nearest integer) Assume that there is no other way of consuming stored energy. Given : The enthalpy of evaporation of water is $45\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ Molar mass of C, H & O are 12, 1 and 16 $\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$.

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    Answer: 360

15. Q752023 · 24 Jan 2023 · Shift 1

    Match List I with List II $$\begin{array}{llll}& \text{List-I}& & \text{List-II}\\ \text{A.}& \text{Chlorophyll}& \text{I.}& \mathrm{N}{\mathrm{a}}_2\mathrm{C}{\mathrm{O}}_3\\ \text{B.}& \text{Soda ash}& \text{II.}& \mathrm{CaS}{\mathrm{O}}_4\\ \text{C.}& \text{Dentistry, Ornamental work}& \text{III.}& \mathrm{M}{\mathrm{g}}^{2+}\\ \text{D.}& \text{Used in white washing}& \text{IV.}& \mathrm{Ca}(\mathrm{OH}{)}_2\end{array}$$ Choose the correct answer from the options given below :

    1. A.A-III, B-I, C-II, D-IV
    2. B.A-II, B-III, C-IV, D-I
    3. C.A-II, B-I, C-III, D-IV
    4. D.A-III, B-IV, C-I, D-II
    Show answer

    Answer: A

16. Q772023 · 24 Jan 2023 · Shift 1

    Match List I with List II $$\begin{array}{llll}& \text{List-I}& & \text{List-II}\\ \text{A.}& \text{Reverberatory furnace}& \text{I.}& \text{Pig Iron}\\ \text{B.}& \text{Electrolytic cell}& \text{II.}& \text{Aluminium}\\ \text{C.}& \text{Blast furnace}& \text{III.}& \text{Silicon}\\ \text{D.}& \text{Zone Refining furnace}& \text{IV.}& \text{Copper}\end{array}$$ Choose the correct answer from the options given below :

    1. A.A-III, B-IV, C-I, D-II
    2. B.A-IV, B-II, C-I, D-III
    3. C.A-I, B-IV, C-II, D-III
    4. D.A-I, B-III, C-II, D-IV
    Show answer

    Answer: B

17. Q842023 · 24 Jan 2023 · Shift 1· Numerical answer
    
    Show answer

    Answer: 25

18. Q812023 · 24 Jan 2023 · Shift 2· Numerical answer

    Total number of tripeptides possible by mixing of valine and proline is ___________

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    Answer: 8