Back to BIOMOLECULES

Your Progress

0 / 315 Answered

Correct

Incorrect

Accuracy

JEE • CHEMISTRY • BIOMOLECULES

Biomolecules practice · Mixed difficulty

Choose an answer to check it, or open “View answer” to study the explanation. Sign in to save progress to your account.

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.

Take a chapter quiz →

Showing 91-120 of 315 questions

Preparing practice and saved progress…

91 Medium

91 of 315

Remembering +4 | -1

Fructose present in honey is

View answer and explanation

Correct option: A

Laevorotatory

Option A (Laevorotatory) is correct because fructose, a sugar found in honey, rotates plane-polarized light to the left, hence it is laevorotatory.

92 Medium

92 of 315

Remembering +4 | -1

Deficiency of vitamin D causes

View answer and explanation

Correct option: A

Rickets

Option A (Rickets) is correct because a deficiency in vitamin D leads to rickets, a condition affecting bone development.

93 Medium

93 of 315

Remembering +4 | -1

Which of the following indicates to 'regions of ordered structure within a protein'.

View answer and explanation

Correct option: B

Secondary structure

Option B (Secondary structure) is correct because the secondary structure of a protein refers to the local ordered structures like alpha-helices and beta-sheets.

94 Easy

94 of 315

Remembering +4 | -1

Oligosaccharides contain…. Simple sugar units:

View answer and explanation

Correct option: A

2 to 10

Option A (2 to 10) is correct because oligosaccharides are defined as carbohydrates containing 2 to 10 monosaccharide units.

95 Medium

95 of 315

Remembering +4 | -1

The secondary structure of a protein refers to

View answer and explanation

Correct option: B

\alpha

-helical backbone

Option B (

\alpha

-helical backbone) is correct because the secondary structure of a protein often refers to the

\alpha

-helical or

\beta

-pleated sheet conformations of the polypeptide backbone.

96 Medium

96 of 315

Understanding +4 | -1

Select the incorrect statement from the following.

View answer and explanation

Correct option: D

Cellulose is a branched chain polysaccharide made up of only

\alpha

-glucose units.

Option D (Cellulose is a branched chain polysaccharide made up of only

\alpha

-glucose units) is correct because cellulose is a straight-chain polysaccharide made up of

\beta

-glucose units, not branched and not

\alpha

-glucose.

97 Medium

97 of 315

Understanding +4 | -1

The detergency of a substance can be increased by addition of :

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because the detergency of a substance can be enhanced by adding another detergent, builders like sodium tripolyphosphate, or other additives.

98 Medium

98 of 315

Remembering +4 | -1

The central dogma of molecular genetics states that the genetic information flows from

View answer and explanation

Correct option: D

DNA

\to

RNA

\to

Proteins

Option D (DNA

\to

RNA

\to

Proteins) is correct because the central dogma of molecular biology states that genetic information flows from DNA to RNA to proteins.

99 Medium

99 of 315

Remembering +4 | -1

Kwashiorkar is caused by the deficiency of

View answer and explanation

Correct option: D

essential amino acids

Option D (essential amino acids) is correct because Kwashiorkor is a nutritional disorder caused by a deficiency of essential amino acids in the diet.

100 Medium

100 of 315

Remembering +4 | -1

Fertility preventing steroid is

View answer and explanation

Correct option: A

Diosgenin

Option A (Diosgenin) is correct because diosgenin is a steroid sapogenin used in the synthesis of steroidal hormones, including those used in fertility control.

101 Medium

101 of 315

Understanding +4 | -1

Which of the following carbohydrate does not correspond to the general formula

\mathrm{C}_x\left(\mathrm{H}_2 \mathrm{O}\right)_y

View answer and explanation

Correct option: B

2-Deoxyribose

Option B (2-Deoxyribose) is correct because its formula is

\mathrm{C}_5\mathrm{H}_{10}\mathrm{O}_4

, which does not fit the general formula

\mathrm{C}_x(\mathrm{H}_2\mathrm{O})_y

102 Easy

102 of 315

Remembering +4 | -1

Citrus fruits are an important source of vitamin:

View answer and explanation

Correct option: B

Option B (C) is correct because citrus fruits are well-known for being a rich source of Vitamin C.

103 Easy

103 of 315

Remembering +4 | -1

Ascorbic acid is a/an:

View answer and explanation

Correct option: A

Vitamin C

Option A (Vitamin C) is correct because Ascorbic acid is also known as Vitamin C.

104 Medium

104 of 315

Remembering +4 | -1

C-2 epimer of D-Glucose is

View answer and explanation

Correct option: C

D-Mannose

Option C (D-Mannose) is correct because D-Mannose is the C-2 epimer of D-Glucose, meaning they differ in configuration only at the C-2 carbon.

105 Easy

105 of 315

Remembering +4 | -1

Hexoses and pentoses are

View answer and explanation

Correct option: B

Monosaccharides

Option B (Monosaccharides) is correct because hexoses and pentoses are simple sugars, which are classified as monosaccharides.

Explore Other Chapters in CHEMISTRY

View All →

P-BLOCK ELEMENTS 736 MCQs Equilibrium 696 MCQs STRUCTURE OF ATOM 634 MCQs THERMODYNAMICS 536 MCQs CHEMICAL BONDING & MOLECULAR STRUCTURE 514 MCQs SOLUTIONS 480 MCQs

106 Easy

106 of 315

Remembering +4 | -1

The ultimate product of the hydrolysis of starch is:

View answer and explanation

Correct option: A

Glucose

Option A (Glucose) is correct because starch is a polysaccharide made up of glucose units, and hydrolysis breaks it down into its constituent glucose molecules.

107 Easy

107 of 315

Remembering +4 | -1

Which of the following vitamins is present in cod-liver oil?

View answer and explanation

Correct option: A

The correct answer is A (A) because cod-liver oil is a well-known source of Vitamin A.

108 Medium

108 of 315

Remembering +4 | -1

An amine hormone is

View answer and explanation

Correct option: B

Adrenaline

Option B (Adrenaline) is correct because adrenaline is an amine hormone derived from the amino acid tyrosine, while the other options are steroid hormones.

109 Medium

109 of 315

Remembering +4 | -1

In DNA, C joins with ____ base by _____ hydrogen bonds.

View answer and explanation

Correct option: B

G, 3

Option B (G, 3) is correct because in DNA, cytosine (C) always pairs with guanine (G) through three hydrogen bonds.

110 Medium

110 of 315

Analyzing +4 | -1

Assertion (A): Sucrose is laevorotatory.

Reason (R): Sucrose on hydrolysis gives dextrorotatory glucose

\left(+52.5^{\circ}\right)

and laevorotation of fructose

\left(-92.4^{\circ}\right)

View answer and explanation

Correct option: D

(A) is incorrect but (R) is correct

Option D is correct because sucrose is dextrorotatory, but after hydrolysis, the resulting mixture is laevorotatory due to the higher laevorotation of fructose.

111 Easy

111 of 315

Remembering +4 | -1

Which one of the following sets of monosaccharides forms sucrose?

View answer and explanation

Correct option: D

\alpha

-D-Glucopyranose and

\beta

D-fructofuranose

Option D (

\alpha

-D-Glucopyranose and

\beta

D-fructofuranose) is correct because sucrose is formed by the glycosidic linkage between

\alpha

-D-glucopyranose and

\beta

-D-fructofuranose.

112 Easy

112 of 315

Remembering +4 | -1

Fats contain higher percentage of :

View answer and explanation

Correct option: B

Saturated fatty acids

Option B (Saturated fatty acids) is correct because fats, by definition, are triglycerides of saturated fatty acids, which are solid at room temperature.

113 Easy

113 of 315

Analyzing +4 | -1

Assertion: The source is a disaccharide and a non-reducing sugar.

Reason: The source involves the glycosidic linkage between

\mathrm{C}_1

\beta

-glucose and

\mathrm{C}_2

\alpha

fructose.

View answer and explanation

Correct option: C

Assertion is true, but Reason is false

The correct answer is C because sucrose is a disaccharide and a non-reducing sugar, but the glycosidic linkage is between C1 of

\alpha

-glucose and C2 of

\beta

-fructose.

114 Medium

114 of 315

Remembering +4 | -1

Which one is the complimentary base in RNA strand to the adenine base in DNA during protein synthesis?

View answer and explanation

Correct option: D

Cytosine

Option C (Uracil) is correct because in RNA, uracil (U) base pairs with adenine (A), while in DNA, thymine (T) base pairs with adenine (A).

115 Hard

115 of 315

Application +4 | -1

In an amino acid, the carboxyl group ionizes at

\mathrm{p}{K_{{a_1}}} = 2.34

and ammonium ion at

\mathrm{p}{K_{{a_2}}} = 9.6

. The isoelectric point of the amino acid is at pH

View answer and explanation

Correct option: A

5.97

Option C (

\ - \pi - 3{\sin ^{ - 1}}x

) is correct because given the range of x,

{\sin ^{ - 1}}(3x - 4x^3)

simplifies to

\ - \pi - 3{\sin ^{ - 1}}x

116 Easy

116 of 315

Remembering +4 | -1

Dextrins

{\left( {{\mathrm{C}_6}{\mathrm{H}_{10}}{\mathrm{O}_5}} \right)_n}

are used in:

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because dextrins are used in making adhesives, confectionery, and sizing paper.

117 Medium

117 of 315

Understanding +4 | -1

Which among the following is not essential amino acid but optically active?

View answer and explanation

Correct option: B

Asparagine

Option B (Asparagine) is correct because asparagine is not an essential amino acid, but it is optically active due to the chiral carbon atom.

118 Easy

118 of 315

Remembering +4 | -1

Which one of the following is an example of a non-reducing sugar?

View answer and explanation

Correct option: A

Sucrose

Option A (Sucrose) is correct because sucrose does not have a free aldehyde or ketone group, making it a non-reducing sugar.

119 Easy

119 of 315

Remembering +4 | -1

Fats are ester of

View answer and explanation

Correct option: B

Glycerol

Option B (Glycerol) is correct because fats are triglycerides, which are esters formed from glycerol and fatty acids.

120 Medium

120 of 315

Analyzing +4 | -1

Periodic acid splits glucose and fructose into formaldehyde and formic acid, ratio of moles of formic acid
in glucose and fructose is

View answer and explanation

Correct option: B

5:3

Option B (

5:3

) is correct because periodic acid (

HIO_4

) oxidation of glucose yields 5 moles of formic acid, while fructose yields 3 moles of formic acid.

Revision notes and key takeaways

Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.

Showing 91-120 of 315 questions

Your Progress

Biomolecules practice · Mixed difficulty

Explore Other Chapters in CHEMISTRY

Continue Your Practice

Your practice