Biomolecules · JEE Main previous year questions

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

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

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

1. A.
2. B.
3. C.
4. D.

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)

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

1. A.YQLF
2. B.FIQY
3. C.PLDY
4. D.FLDY

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.${\mathrm{X}}_{2.5}\mathrm{Y}$

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 $\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$.

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

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

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

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

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.

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)

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.$\mathrm{A}={\mathrm{C}}_7{\mathrm{H}}_{14}{\mathrm{O}}_8$, $\mathrm{B}={\mathrm{C}}_6{\mathrm{H}}_{14}{\mathrm{O}}_6$

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

$250\text{ g}$ 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

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: $\mathrm{R}=8.314{\text{ J K}}^{-1}{\text{ mol}}^{-1}$)

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)

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

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.

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 : $\mathrm{R}=8.3\mathrm{J}{\mathrm{K}}^{-1}\mathrm{mo}{\mathrm{l}}^{-1}$)

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.