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JEE • CHEMISTRY • BIOMOLECULES

Biomolecules practice · Medium

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These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 61-90 of 159 questions
61 Medium
61 of 159
Remembering +4 | -1
Which of the following is not a fat soluble vitamin?
View answer and explanation
Correct option: A
Vitamin B complex
Option A (Vitamin B complex) is correct because Vitamin B complex is a water-soluble vitamin, while Vitamins A, D, and E are fat-soluble.
62 Medium
62 of 159
Remembering +4 | -1
Which element is absent in protein?
View answer and explanation
Correct option: D
PP
Option D (PP) is correct because while proteins contain carbon, nitrogen, sulfur, and oxygen, they do not generally contain phosphorus.
63 Medium
63 of 159
Analyzing +4 | -1
Assertion (A): Acetic acid is a carbohydrate.

Reason (R): Acetic acid fits into general formula of carbohydrate, i.e. Cx(H2O)y{C}_x\left({H}_2 {O}\right)_y.
View answer and explanation
Correct option: D
(A) is incorrect but (R) is correct
The correct answer is D because acetic acid does fit the general carbohydrate formula but is not classified as a carbohydrate.
64 Medium
64 of 159
Remembering +4 | -1
DNA and RNA contain four bases each. Which of the following bases is not present in RNA?
View answer and explanation
Correct option: C
Thymine
Option C (Thymine) is correct because RNA contains Uracil instead of Thymine, which is present in DNA.
65 Medium
65 of 159
Understanding +4 | -1
Which one of the following statements is not true about enzymes?
View answer and explanation
Correct option: A
Enzymes are non-specific for a reaction and substrate.
Option A is the correct statement that is not true about enzymes. Enzymes are highly specific for a particular reaction and substrate, not non-specific.
66 Medium
66 of 159
Understanding +4 | -1
Assertion (A): When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained.

Reason (R): RNA molecules are of three types and they perform different functions.
View answer and explanation
Correct option: B
Both A\mathrm{A} and R\mathrm{R} are correct; R\mathrm{R} is not the correct explanation of AA.
Option B (Both A and R are correct; R is not the correct explanation of A) is correct because both the assertion and the reason are true, but the reason does not explain the assertion.
67 Medium
67 of 159
Remembering +4 | -1
Table sugar is
View answer and explanation
Correct option: A
A disaccharide of D-glucose and D-fructose
Option A (A disaccharide of D-glucose and D-fructose) is correct because table sugar (sucrose) is a disaccharide composed of D-glucose and D-fructose.
68 Medium
68 of 159
Remembering +4 | -1
α−\alpha - maltose consists of
View answer and explanation
Correct option: D
Two α−D−\alpha - \mathrm{D} - lucopyranose units with 1-4 glycosidic linkage
Option D is correct because α−\alpha - maltose is composed of two α−D−\alpha - \mathrm{D} - glucose units linked by a 1-4 glycosidic bond.
69 Medium
69 of 159
Remembering +4 | -1
Linseed oil is:
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because linseed oil is used in soap formation, is a drying oil, and acts as a carrier for paints.
70 Medium
70 of 159
Remembering +4 | -1
Compound AA gives D-galactose and D-glucose on hydrolysis. The compound AA is
View answer and explanation
Correct option: D
lactose
Option D (lactose) is correct because lactose, upon hydrolysis, yields D-galactose and D-glucose.
71 Medium
71 of 159
Analyzing +4 | -1
Assertion(A): β\beta-glycosidic linkage is present in maltose.

Reason (R): Maltose is composed of two glucose units in which C−1\mathrm{C}-1 of one glucose unit is linked to C−4\mathrm{C}-4 of another glucose unit.
View answer and explanation
Correct option: D
(A) is incorrect but (R) is correct
Assertion (A) is incorrect and Reason (R) is correct because maltose has an alpha-glycosidic linkage, not a beta-glycosidic linkage, and it is composed of two glucose units linked C-1 to C-4.
72 Medium
72 of 159
Understanding +4 | -1
Assertion: The pentaacetate of glucose does not react with hydroxylamine.

Reason: This is because free aldehyde group is not present in pentaacetate.
View answer and explanation
Correct option: A
If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Option A is correct because the pentaacetate of glucose does not have a free aldehyde group due to its cyclic structure, and therefore cannot react with hydroxylamine. The reason correctly explains the assertion.
73 Medium
73 of 159
Understanding +4 | -1
A tripeptide is composed equally of L-valine, L-tryosine and L-alanine (one molecule of each). How many isomeric tripeptide of this kind may exist?
View answer and explanation
Correct option: C
6
Option C (6) is correct because there are 6 possible arrangements of the three different amino acids in a tripeptide.
74 Medium
74 of 159
Remembering +4 | -1
Thiamine and pyridoxine are also known respectively as
View answer and explanation
Correct option: D
Vitamin B1{B_1} and Vitamin B6{B_6}
Correct Answer + Core Reason: Option C (B1B_1 and B6B_6) is correct because thiamine is vitamin B1B_1 and pyridoxine is vitamin B6B_6.
75 Medium
75 of 159
Understanding +4 | -1
Pick up the correct statement about the denaturation of protein.
View answer and explanation
Correct option: B
During denaturation 2∘2^{\circ} and 3∘3^{\circ} structures of proteins are destroyed but 1∘1^{\circ} structure remains intact
Option B is correct because during denaturation, the secondary and tertiary structures of proteins are disrupted, while the primary structure (amino acid sequence) remains intact.

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76 Medium
76 of 159
Remembering +4 | -1
Which of the following is a linear polymer?
View answer and explanation
Correct option: D
Amylose
The correct answer is D (Amylose) because amylose is a linear polymer of glucose units linked by alpha-1,4-glycosidic bonds, without branching.
77 Medium
77 of 159
Understanding +4 | -1
Assertion (A): Disruption of the natural structure of a protein is called denaturation.

Reason (R): During denaturation 3∘3^{\circ} and 2∘2^{\circ} structures of protein changed to 1∘1^{\circ}-structure.
View answer and explanation
Correct option: A
Both (A) and(R) are correct and (R) is the correct explanation of (A)
Option A is correct because denaturation involves disruption of the protein's natural structure, and this disruption involves changes to the 3∘3^{\circ} and 2∘2^{\circ} structures, converting them into the 1∘1^{\circ} structure.
78 Medium
78 of 159
Remembering +4 | -1
Chromosomes are made from
View answer and explanation
Correct option: D
carbohydrates and nucleic acids
Option C (proteins and nucleic acids) is correct because chromosomes are composed of DNA (a nucleic acid) tightly coiled around proteins called histones.
79 Medium
79 of 159
Understanding +4 | -1
Which of the following is/are the application(s) of the DNA fingerprinting?
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because DNA fingerprinting has applications in forensic science, paternity testing, and identifying racial groups for evolutionary studies.
80 Medium
80 of 159
Understanding +4 | -1
Which of the following statements are correct about globular proteins?

(a) Globular proteins are usually soluble in water

(b) In these proteins, chains of polypeptides coil around each other to give a spherical shape

(c) Insulin is an example of globular protein

(d) Albumin is an example of globular protein
View answer and explanation
Correct option: B
a, b ,c are correct
Option B (a, b, c are correct) is correct because globular proteins are generally water-soluble, have a spherical shape due to polypeptide chains coiling around each other, and insulin is a globular protein.
81 Medium
81 of 159
Remembering +4 | -1
Structurally, the cellulose is a linear polymer of
View answer and explanation
Correct option: B
β\beta-D-glucose molecules
Option B (β\beta-D-glucose molecules) is correct because cellulose is a linear polymer made of β\beta-D-glucose units linked by β\beta-1,4-glycosidic bonds.
82 Medium
82 of 159
Understanding +4 | -1
In the acetylation of glucose, which group is involved in the reaction
View answer and explanation
Correct option: C
alcoholic OH\mathrm{OH} group
Option C (alcoholic OH group) is correct because acetylation involves the reaction of acetic anhydride with the hydroxyl groups of glucose.
83 Medium
83 of 159
Remembering +4 | -1
Secondary structure of protein is mainly governed by
View answer and explanation
Correct option: A
hydrogen bonds
Option A (hydrogen bonds) is correct because the secondary structure of proteins, such as alpha-helices and beta-sheets, is primarily stabilized by hydrogen bonds between amino acid residues.
84 Medium
84 of 159
Analyzing +4 | -1
Identify the correct series of biomolecules which do not belong to the given category

- Homopolymer

- Secondary metabolite

- Neutral Aminoacid

- Aromatic aminoacid

Options:
View answer and explanation
Correct option: A
Insulin, Rubber, Valine, Tryptophan
Option A (Insulin, Rubber, Valine, Tryptophan) is correct because Insulin is a homopolymer, Rubber is a secondary metabolite, Valine is a neutral amino acid, and Tryptophan is an aromatic amino acid.
85 Medium
85 of 159
Remembering +4 | -1
Proteins can be classified into two types on the basis of their molecular shape i.e. fibrous proteins and globular proteins. Examples of fibrous proteins are

I. insulin

II. keratin

III. albumin

IV. myosin

Select the correct option.
View answer and explanation
Correct option: B
II and IV
Option B (II and IV) is correct because Keratin (hair, wool) and Myosin (muscles) are examples of fibrous proteins, while Insulin and Albumin are globular proteins.
86 Medium
86 of 159
Analyzing +4 | -1
Assertion:- Glucose reacts with Br2\mathrm{Br}_2 to forms accharic acid.

Reason:- Acid will be formed by oxidation of alcohol with Br2\mathrm{Br}_2.
View answer and explanation
Correct option: D
If both assertion & reason are false
Option D is correct because both the assertion and reason are false. Glucose reacts with Br2 to form gluconic acid, not saccharic acid, and Br2 oxidizes the aldehyde group, not the alcohol group.
87 Medium
87 of 159
Remembering +4 | -1
A saturated fatty acid found in oils and fats is:
View answer and explanation
Correct option: A
Palmitic acid
Option A (Palmitic acid) is correct because palmitic acid (C15H31COOH\mathrm{C}_{15}\mathrm{H}_{31}\mathrm{COOH}) is a saturated fatty acid commonly found in oils and fats.
88 Medium
88 of 159
Remembering +4 | -1
The mineral elements required for carbohydrate translocation, photoysis of water and for chlorophyll synthesis are respectively
View answer and explanation
Correct option: A
Boron, Manganese, Zinc
Option B (Boron, chlorine, Iron) is the correct answer. Boron is required for carbohydrate translocation, chlorine for photolysis of water, and iron for chlorophyll synthesis.
89 Medium
89 of 159
Remembering +4 | -1
The number of disulphide linkage present in insulin are
View answer and explanation
Correct option: B
2
Option C (3) is correct because there are 3 disulfide linkages present in insulin.
90 Medium
90 of 159
Understanding +4 | -1
Which pair of compound will be show mutarotation?
View answer and explanation
Correct option: A
Glucose, Fructose
Option A (Glucose, Fructose) is correct because both glucose and fructose exist in cyclic hemiacetal/hemiketal forms that can interconvert, leading to a change in optical rotation.
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