Biomolecules · JEE Main previous year questions

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

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

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 ${\mathrm{B}}_{12}$

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 $41.1\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ ; $\mathrm{R}=8.31\mathrm{J}{\mathrm{K}}^{-1}\mathrm{mo}{\mathrm{l}}^{-1}$]

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]

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

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

A peptide synthesized by the reactions of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have _________ peptide linkages.

Given below are two statements : one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A) : Sucrose is a disaccharide and a non-reducing sugar. Reason (R) : Sucrose involves glycosidic linkage between ${\mathrm{C}}_1$ of $\beta$-glucose and ${\mathrm{C}}_2$ of $\alpha$-fructose. Choose the most appropriate answer from the options given below :

1. A.Both (A) and (R) are true but (R) is not the true explanation of (A).
2. B.(A) is false but (R) is true.
3. C.(A) is true but (R) is false.
4. D.Both (A) and (R) are true and (R) is the true explanation of (A).

For water ${\Delta }_{\mathrm{vap}}\mathrm{H}=41{\text{ kJ mol}}^{-1}$ at 373 K and 1 bar pressure. Assuming that water vapour is an ideal gas that occupies a much larger volume than liquid water, the internal energy change during evaporation of water is ___________ ${\text{kJ mol}}^{-1}$ [$\text{Use : }\mathrm{R}=8.3{\text{ J mol}}^{-1}{\text{ K}}^{-1}$]

Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is :

1. A.Amylose
2. B.Sucrose
3. C.Maltose
4. D.Lactose

Which one of the following species responds to an external magnetic field?

1. A.$[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}$
2. B.$[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}$
3. C.$[\mathrm{Co}(\mathrm{CN}{)}_6{]}^{3-}$
4. D.$[\mathrm{Ni}(\mathrm{CO}{)}_4]$

The water soluble protein is :

1. A.Fibrin
2. B.Albumin
3. C.Myosin
4. D.Collagen

A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is ____________ J. (Nearest integer)

If the concentration of glucose (${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6$) in blood is $0.72\mathrm{g}{\mathrm{L}}^{-1}$, the molarity of glucose in blood is ____ $\times 10^{-3}$ M. (Nearest integer) [Given : Atomic mass of C = 12, H = 1, O = 16 u]

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

An average person needs about $10000\text{ kJ}$ energy per day. The amount of glucose ($\text{molar mass}=180.0{\text{ g mol}}^{-1}$) needed to meet this energy requirement is ________ g. (Use : ${\Delta }_{\text{c}}\text{H(glucose)}=-2700{\text{ kJ mol}}^{-1}$)

Match List - I with List - II $$\begin{array}{llll}& \text{List - I}& & \text{List - II}\\ \text{(a)}& \text{Chlorophyll}& \text{(i)}& \text{Ruthenium}\\ \text{(b)}& \text{Vitamin-}{B}_{12}& \text{(ii)}& \text{Platinum}\\ \text{(c)}& \text{Anticancer drug}& \text{(iii)}& \text{Cobalt}\\ \text{(d)}& \text{Grubbs catalyst}& \text{(iv)}& \text{Magnesium}\end{array}$$ Choose the most appropriate answer from the options given below :

1. A.(a) - (iii), (b) - (ii), (c) - (iv), (d) - (i)
2. B.(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
3. C.(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
4. D.(a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)

Deficiency of vitamin K causes :

1. A.Cheilosis
2. B.Decrease in blood clotting time
3. C.Increase in blood clotting time
4. D.Increase in fragility of RBC's

Which among the following pairs of Vitamins is stored in our body relatively for longer duration?

1. A.Thiamine and Vitamin A
2. B.Ascorbic acid and Vitamin D
3. C.Thiamine and Ascorbic acid
4. D.Vitamin A and Vitamin D

Which of the following vitamins is helpful in delaying the blood clotting?

1. A.Vitamin K
2. B.Vitamin C
3. C.Vitamin E
4. D.Vitamin B

Match List - I with List - II. | List - I | List - II | | :--- | :--- | | (a) Sucrose | (i) $\beta$-D-Galactose and $\beta$-D-Glucose | | (b) Lactose | (ii) $\alpha$-D-Glucose and $\beta$-D-Fructose | | (c) Maltose | (iii) $\alpha$-D-Glucose and $\alpha$-D-Glucose | Choose the correct answer from the options given below :

1. A.(a) $\to$ (iii), (b) $\to$ (ii), (c) $\to$ (i)
2. B.(a) $\to$ (i), (b) $\to$ (iii), (c) $\to$ (ii)
3. C.(a) $\to$ (ii), (b) $\to$ (i), (c) $\to$ (iii)
4. D.(a) $\to$ (iii), (b) $\to$ (i), (c) $\to$ (ii)

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

Five moles of an ideal gas at 293 K is expanded isothermally from an initial pressure of 2.1 MPa to 1.3 MPa against at constant external pressure 4.3 MPa. The heat transferred in this process is ____ $\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$. (Rounded off to the nearest integer) [Use $\mathrm{R}=8.314\mathrm{J}\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{K}}^{-1}$]

The mole fraction of glucose (${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6$) in an aqueous binary solution is 0.1. The mass percentage of water in it, to the nearest integer, is _______.