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JEE • CHEMISTRY • BIOMOLECULES

Biomolecules practice · Medium

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Practice format and chapter quiz

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 1-30 of 159 questions
1 Medium
1 of 159
Understanding +4 | -1
Which one of the following compounds is different from the rest in terms of undergoing hydrolysis to form simpler compounds?
View answer and explanation
Correct option: D
Glucose
Option D is correct because glucose is a monosaccharide and cannot be further hydrolyzed into simpler compounds, whereas sucrose, maltose, and lactose are disaccharides that can be hydrolyzed into monosaccharides.
2 Medium
2 of 159
Remembering +4 | -1
Which of the following enzymes, converts glucose to alcohol?
View answer and explanation
Correct option: A
Zymase
Option A (Zymase) is correct because zymase is an enzyme complex that catalyzes the fermentation of sugars like glucose into ethanol and carbon dioxide.
3 Medium
3 of 159
Remembering +4 | -1
The one which has least iodine value is
View answer and explanation
Correct option: C
Ghee
Option C (Ghee) is correct because ghee has the lowest degree of unsaturation among the given oils, resulting in the lowest iodine value.
4 Medium
4 of 159
Understanding +4 | -1
Which of the following statements is true about a peptide bond (RCONHR)?
View answer and explanation
Correct option: B
It is capable of forming a hydrogen bond.
Option B (It is capable of forming a hydrogen bond) is correct because the N-H group in a peptide bond can act as a hydrogen bond donor, and the C=O group can act as a hydrogen bond acceptor.
5 Medium
5 of 159
Understanding +4 | -1
Peptide and hydrogen bonds are present in the Primary structure of protein is due to
View answer and explanation
Correct option: A
Primary and alpha helix structure respectively
Option A (Primary and alpha helix structure respectively) is correct because peptide bonds are characteristic of the primary structure, while hydrogen bonds are crucial for the alpha-helix secondary structure.
6 Medium
6 of 159
Remembering +4 | -1
Glucose on reaction with HNO3{HNO}_3 forms
View answer and explanation
Correct option: B
Saccharic acid
Option B (Saccharic acid) is correct because glucose, when reacted with HNO3{HNO}_3, gets oxidized to saccharic acid (also known as glucaric acid).
7 Medium
7 of 159
Remembering +4 | -1
Complete hydrolysis of cellulose gives
View answer and explanation
Correct option: C
D-glucose
Option C (D-glucose) is correct because cellulose is a polysaccharide made up of D-glucose units linked by beta-glucosidic bonds, and hydrolysis breaks these bonds to release D-glucose.
8 Medium
8 of 159
Remembering +4 | -1
Both nitrogen and sulphur containing water soluble vitamin is
View answer and explanation
Correct option: B
Vitamin B1{B_1}
Option B (Vitamin B1{B_1}) is correct because Vitamin B1{B_1} (Thiamine) is a water-soluble vitamin that contains both nitrogen and sulfur.
9 Medium
9 of 159
Remembering +4 | -1
The commonest disaccharide has the molecular formula
View answer and explanation
Correct option: D
C12H22O11\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}
Option D (C12H22O11\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}) is correct because it represents the molecular formula of common disaccharides like sucrose, maltose, and lactose.
10 Medium
10 of 159
Remembering +4 | -1
Bases common in RNA and DNA are
View answer and explanation
Correct option: A
Adenine, guanine, cytosine
Option A (Adenine, guanine, cytosine) is correct because these three bases are common to both RNA and DNA.
11 Medium
11 of 159
Remembering +4 | -1
An example for a saturated fatty acid, presents in nature is
View answer and explanation
Correct option: D
Palmitic acid
Option D (Palmitic acid) is correct as it is a saturated fatty acid with the formula C15H31COOH{\mathrm{C}_{15}}{\mathrm{H}_{31}}\mathrm{COOH}.
12 Medium
12 of 159
Remembering +4 | -1
Which set is the correct pairing set (or contains complementary pairs) responsible for the structure of DNA?

(A = adenine, G = guanine, C = cytosine, T = thymine, U = uracil)
View answer and explanation
Correct option: A
A—T, G—C
Option A (A—T, G—C) is correct because adenine pairs with thymine and guanine pairs with cytosine in DNA.
13 Medium
13 of 159
Analyzing +4 | -1
Consider following reagents,

(I) Br2\mathrm{Br}_2 water

(II) Tollen's reagent and

(III) Fehling's solution.

Which reagent(s) can be used to make distinction between an aldose and a ketose?
View answer and explanation
Correct option: C
(I) only
Option C ((I) only) is correct because bromine water can distinguish between aldoses and ketoses due to its ability to oxidize aldoses but not ketoses.
14 Medium
14 of 159
Remembering +4 | -1
Among the following vitamins the one whose deficiency causes rickets (bone deficiency) is
View answer and explanation
Correct option: C
Vitamin D
Option C (Vitamin D) is correct because a deficiency in Vitamin D is the primary cause of rickets, a bone deficiency disease.
15 Medium
15 of 159
Remembering +4 | -1
Proteins are found to have two different types of secondary structures viz α\alpha-helix and β\beta-pleated sheet structure. α\alpha-helix structure of protein is stabilised by
View answer and explanation
Correct option: C
hydrogen bonds
Option C (hydrogen bonds) is correct because the alpha-helix structure of proteins is stabilized by hydrogen bonds between the NH group of one amino acid and the CO group of another.

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16 Medium
16 of 159
Remembering +4 | -1
RNA contains
View answer and explanation
Correct option: B
Ribose sugar and uracil
Option B (Ribose sugar and uracil) is correct because RNA contains ribose sugar as its pentose sugar and uracil as one of its nitrogenous bases.
17 Medium
17 of 159
Remembering +4 | -1
Which of the following contains the highest percentage of protein?
View answer and explanation
Correct option: A
Groundnut
Option A (Groundnut) is correct because groundnuts contain the highest percentage of protein compared to the other options.
18 Medium
18 of 159
Understanding +4 | -1
Which of the given statements is incorrect about glycogen?
View answer and explanation
Correct option: A
It is straight chain polymer similar to amylose
Option A (It is straight chain polymer similar to amylose) is correct because glycogen is a branched polymer similar to amylopectin, not a straight chain polymer like amylose.
19 Medium
19 of 159
Analyzing +4 | -1
Assertion:- Sucrose and saccharin have nearly same sweetness index.

Reason:- Both compounds are the component of carbohydrate.
View answer and explanation
Correct option: D
If both assertion & reason are false
Option D is correct because both the assertion and the reason are false. Sucrose and saccharin do not have nearly the same sweetness index, and saccharin is not a carbohydrate.
20 Medium
20 of 159
Understanding +4 | -1
Assertion (A): The term vitamine is replaced by vitamin now a days.

Reason (R): Vitamine came from the word, vital + amine and it was identified that most of them did not contain amino groups.
View answer and explanation
Correct option: A
Both A\mathrm{A} and R\mathrm{R} are correct; R\mathrm{R} is the correct explanation of A\mathrm{A}.
Option A is correct because both the assertion and the reason are correct, and the reason correctly explains why the term \"vitamine\" was changed to \"vitamin.\"
21 Medium
21 of 159
Understanding +4 | -1
Assertion : Sucrose undergoes mutarotation.

Reason: Sucrose is a disaccharide.
View answer and explanation
Correct option: B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
Option B (If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion) is correct because sucrose is a disaccharide and it undergoes mutarotation after hydrolysis into glucose and fructose, but being a disaccharide is not the direct cause of mutarotation.
22 Medium
22 of 159
Remembering +4 | -1
What is the common name given to the enzyme which catalyse the oxidation of one substrate with simultaneous reduction of another substrate?
View answer and explanation
Correct option: C
Oxidoreductase
Option C (Oxidoreductase) is correct because oxidoreductases are enzymes that catalyze oxidation-reduction reactions, involving the transfer of electrons between substrates.
23 Medium
23 of 159
Analyzing +4 | -1
Difference between the number of chiral carbon present in β\beta-D-(+)-Glucose and β\beta-D-(-)-Fructose is
View answer and explanation
Correct option: C
1
Option C is correct because β-D-(+)-Glucose has 5 chiral carbons, and β-D-(-)-Fructose has 4 chiral carbons, resulting in a difference of 1.
24 Medium
24 of 159
Understanding +4 | -1
Drying oils are so called because they:
View answer and explanation
Correct option: D
Are highly unsaturated and so undergo atmospheric oxidation to yield resinous residue and becomes hard solid
Option D (Are highly unsaturated and so undergo atmospheric oxidation to yield resinous residue and becomes hard solid) is correct because drying oils contain unsaturated fatty acids that polymerize upon exposure to air, forming a solid film.
25 Medium
25 of 159
Understanding +4 | -1
Which of the following statement is false?
View answer and explanation
Correct option: C
Keratin &\& myosin are fibrous proteins and soluble in water
Option C (Keratin &myosinarefibrousproteinsandsolubleinwater)iscorrectbecausekeratinandmyosinarefibrousproteinsandare∗insoluble∗inwater,notsoluble.\& myosin are fibrous proteins and soluble in water) is correct because keratin and myosin are fibrous proteins and are *insoluble* in water, not soluble.
26 Medium
26 of 159
Remembering +4 | -1
Which of the following is correct pair of pyrimidime bases ?
View answer and explanation
Correct option: C
Thymine and Cytosine
Option C (Thymine and Cytosine) is correct because thymine and cytosine are both pyrimidine bases found in nucleic acids.
27 Medium
27 of 159
Understanding +4 | -1
Which of the following reagent cannot distinguish between glucose and fructose?
View answer and explanation
Correct option: B
Tollen’s reagent
Option D (All of these) is correct because both glucose and fructose are reducing sugars and will react with Fehling's, Tollen's, and Benedict's solutions.
28 Medium
28 of 159
Understanding +4 | -1
When fat is heated with NaOH\mathrm{NaOH} the substances formed are:
View answer and explanation
Correct option: B
Soap and glycerol
Option B (Soap and glycerol) is correct because the reaction of fat with NaOH results in saponification, producing soap and glycerol.
29 Medium
29 of 159
Remembering +4 | -1
Sugar moiety in DNA and RNA molecules respectively are
View answer and explanation
Correct option: B
β\beta-D-2-deoxyribose, β\beta-D-ribose
Option B (β\beta-D-2-deoxyribose, β\beta-D-ribose) is correct because DNA contains β\beta-D-2-deoxyribose, while RNA contains β\beta-D-ribose.
30 Medium
30 of 159
Remembering +4 | -1
An antigen develops antibodies which protect the body from their harmful effects. The antibodies are:
View answer and explanation
Correct option: A
Immunoglobulins
Correct Answer + Core Reason: Option A (Immunoglobulins) is correct because immunoglobulins (antibodies) are proteins that defend the body against harmful substances.
Revision notes and key takeaways

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Key Takeaways

  • ✓ This set contains 159 single-correct-answer MCQs on BIOMOLECULES.
  • ✓ Try each question before opening its answer. Read the explanation where one is available.
  • ✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.
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