Biomolecules · JEE Main previous year questions

The carbohydrate "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose form C. in "D" configuration D. a reducing sugar, when free E. in $\alpha$-anomeric form Choose the correct answer from the options given below:

1. A.A, D and E Only
2. B.B, D and E Only
3. C.A, C and D Only
4. D.A, B and E Only

Consider the following reaction occurring in the blast furnace: $\mathrm{F}{\mathrm{e}}_3{\mathrm{O}}_{4(\mathrm{s})}+4C{\mathrm{O}}_{(\mathrm{g})}\to 3F{\mathrm{e}}_{(\mathrm{l})}+4C{\mathrm{O}}_{2(\mathrm{g})}$ ' $x$ ' $\mathrm{kg}$ of iron is produced when $2.32\times 10^3\mathrm{kgF}{\mathrm{e}}_3{\mathrm{O}}_4$ and $2.8\times 10^2\mathrm{kgCO}$ are brought together in the furnace. The value of ' $x$ ' is ____ . (nearest integer) {Given: molar mass of $\mathrm{F}{\mathrm{e}}_3{\mathrm{O}}_4=232\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ molar mass of $\mathrm{CO}=28\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ molar mass of $\mathrm{Fe}=56\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$}

The $\alpha$-Helix and $\beta$- Pleated sheet structures of protein are associated with its :

1. A.tertiary structure
2. B.quaternary structure
3. C.primary structure
4. D.secondary structure

Which of the following acids is a vitamin ?

1. A.Saccharic acid
2. B.Ascorbic acid
3. C.Aspartic acid
4. D.Adipic acid

Total number of essential amino acid among the given list of amino acids is ________. Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline

The incorrect statement about Glucose is :

1. A.Glucose remains in multiple isomeric form in its aqueous solution
2. B.Glucose is soluble in water because of having aldehyde functional group
3. C.Glucose is an aldohexose
4. D.Glucose is one of the monomer unit in sucrose

Combustion of glucose (${\text{C}}_6{\text{H}}_{12}{\text{O}}_6$) produces ${\text{CO}}_2$ and water. The amount of oxygen (in g) required for the complete combustion of $900\text{ g}$ of glucose is : [Molar mass of glucose in ${\text{g mol}}^{-1}=180$]

1. A.$32$
2. B.$480$
3. C.$800$
4. D.$960$

${\Delta }_{\text{vap}}{\mathrm{H}}^{\ominus }$ for water is $+40.79{\text{ kJ mol}}^{-1}$ at $1\text{ bar}$ and $100^{\circ }\mathrm{C}$. Change in internal energy for this vapourisation under same condition is ______ ${\text{kJ mol}}^{-1}$. (Integer answer) (Given $\mathrm{R}=8.3{\text{ JK}}^{-1}{\text{ mol}}^{-1}$)

The total number of carbon atoms present in tyrosine, an amino acid, is ________.

The incorrect statements regarding enzymes are : (A) Enzymes are biocatalysts. (B) Enzymes are non-specific and can catalyse different kinds of reactions. (C) Most Enzymes are globular proteins. (D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose. Choose the correct answer from the option given below :

1. A.(B) and (D)
2. B.(A), (B) and (C)
3. C.(B) and (C)
4. D.(B), (C) and (D)

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

Match List I with List II \begin{tabular}{|l|l|l|l|} \hline & \textbf{LIST I} & & \textbf{LIST II} \\ \hline A. & $\alpha$ - Glucose and $\alpha$ - Galactose & I. & Functional isomers \\ B. & $\alpha$ - Glucose and $\beta$ - Glucose & II. & Homologous \\ C. & $\alpha$ - Glucose and $\alpha$ - Fructose & III. & Anomers \\ D. & $\alpha$ - Glucose and $\alpha$ - Ribose & IV. & Epimers \\ \hline \end{tabular} Choose the correct answer from the options given below:

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

If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is :

1. A.CATTAGCT
2. B.TACGAAGT
3. C.ATGCGACT
4. D.GTACTTAC

The number of tripeptides formed by three different amino acids using each amino acid once is ______.

Match List I with List II $$\begin{array}{llll}& \text{List - I}& & \text{List - II}\\ \text{(A)}& \text{Glucose}/\mathrm{NaHC}{\mathrm{O}}_3/\Delta & \text{(I)}& \text{Gluconic acid}\\ \text{(B)}& \text{Glucose}/\mathrm{HN}{\mathrm{O}}_3& \text{(II)}& \text{No reaction}\\ \text{(C)}& \text{Glucose}/\mathrm{HI}/\Delta & \text{(III)}& \text{n-hexane}\\ \text{(D)}& \text{Glucose/Bromine water}& \text{(IV)}& \text{Saccharic acid}\end{array}$$ Choose the correct answer from the options given below:

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

From the vitamins $\mathrm{A},{\mathrm{B}}_1,{\mathrm{B}}_6,{\mathrm{B}}_{12},\mathrm{C},\mathrm{D},\mathrm{E}$ and $\mathrm{K}$, the number of vitamins that can be stored in our body is ____.

Type of amino acids obtained by hydrolysis of proteins is :

1. A.$\gamma$
2. B.$\beta$
3. C.$\alpha$
4. D.$\delta$

Match List I with List II | | List - I (Substances) | | List - II (Element Present) | |---|---|---|---| | (A) | Ziegler catalyst | (I) | Rhodium | | (B) | Blood Pigment | (II) | Cobalt | | (C) | Wilkinson catalyst | (III) | Iron | | (D) | Vitamin ${\mathrm{B}}_{12}$ | (IV) | Titanium | Choose the correct answer from the options given below:

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

Match List I with List II | | List - I (Bio Polymer) | | List - II (Monomer) | |---|---|---|---| | (A) | Starch | (I) | nucleotide | | (B) | Cellulose | (II) | $\alpha$-glucose | | (C) | Nucleic acid | (III) | $\beta$-glucose | | (D) | Protein | (IV) | $\alpha$-amino acid | Choose the correct answer from the options given below:

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

Which structure of protein remains intact after coagulation of egg white on boiling?

1. A.Quaternary
2. B.Primary
3. C.Secondary
4. D.Tertiary

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

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

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.$4.69\text{ g}$

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

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