A compound of glycerol with a metal

A molecular compound of glycerol with a metal salt

Polysaccharides of more than one type of monosaccharides

Used for improvement of texture in food industry

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JEE • CHEMISTRY • BIOMOLECULES

Biomolecules practice · Mixed difficulty

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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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181 Medium

181 of 315

Remembering +4 | -1

In nucleic acid, corresponding nucleotides are linked together by -

View answer and explanation

Correct option: C

{C}_3{ }^{\prime}-{C}_5{ }^{\prime}

phosphodiester bond

Option C (

{C}_3{ }^{\prime}-{C}_5{ }^{\prime}

phosphodiester bond) is correct because nucleotides in nucleic acids are linked by phosphodiester bonds between the 3' carbon of one nucleotide and the 5' carbon of the next.

182 Easy

182 of 315

Remembering +4 | -1

A solution of D-glucose in water rotates the plane polarised light:

View answer and explanation

Correct option: A

To the right

Option A (To the right) is correct because D-glucose is dextrorotatory, meaning it rotates plane-polarized light to the right.

183 Easy

183 of 315

Remembering +4 | -1

Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?

View answer and explanation

Correct option: B

A hormone

Option B (A hormone) is correct because insulin is a proteinaceous hormone secreted by the pancreas that regulates glucose metabolism.

184 Medium

184 of 315

Understanding +4 | -1

Which of the following statement(s) is/are false about carbohydrates?

I. It has general formula,

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

.

II. They are hydrates of carbon.

III. The molecular formula of glucose is

\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6

and general formula is

\mathrm{C}_6\left(\mathrm{H}_2 \mathrm{O}\right)_6

.

Choose the correct option.

View answer and explanation

Correct option: D

Only III

Option D is correct because while carbohydrates generally follow the formula Cx(H2O)y and are considered hydrates of carbon, the statement that glucose's general formula is C6(H2O)6 is technically correct but misleading in the context of distinguishing it from other carbohydrates.

185 Hard

185 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

186 Medium

186 of 315

Remembering +4 | -1

Bases common to DNA and RNA are:

View answer and explanation

Correct option: B

Guanine, adenine, cytosine

Option B (Guanine, adenine, cytosine) is correct because guanine, adenine, and cytosine are nitrogenous bases present in both DNA and RNA.

187 Medium

187 of 315

Remembering +4 | -1

Which of the following hormones is excreted from adrenal cortex?

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Correct option: A

Cortisone

Option A (Cortisone) is correct because cortisone is a steroid hormone secreted by the adrenal cortex.

188 Easy

188 of 315

Remembering +4 | -1

The hormone insulin is a secretion of the organ:

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Correct option: D

Pancreas

Option D (Pancreas) is correct because the hormone insulin is secreted by the pancreas, which regulates blood sugar levels.

189 Easy

189 of 315

Remembering +4 | -1

A glyceride is:

View answer and explanation

Correct option: D

An ester of glycerol with fatty acids

Option D (An ester of glycerol with fatty acids) is correct because glycerides are formed when glycerol reacts with fatty acids to form esters.

190 Medium

190 of 315

Understanding +4 | -1

Select the biomolecule(s) that help during the formation of the living system.

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because carbohydrates, nucleic acids, and lipids all play essential roles in the formation and function of living systems.

191 Easy

191 of 315

Remembering +4 | -1

Which of the following set consists only of essential amino acids?

View answer and explanation

Correct option: B

Leucine, lysine, tryptophane

The correct answer is B (Leucine, lysine, tryptophane) because these are all essential amino acids, meaning they cannot be synthesized by the human body and must be obtained from the diet.

192 Easy

192 of 315

Remembering +4 | -1

Which one of the following is a non-steroidal hormone?

View answer and explanation

Correct option: B

Prostaglandin

Option B (Prostaglandin) is correct because prostaglandins are derived from fatty acids and are not steroid-based hormones.

193 Medium

193 of 315

Remembering +4 | -1

The number of disulphide linkage present in insulin are

View answer and explanation

Correct option: B

Option C (3) is correct because there are 3 disulfide linkages present in insulin.

194 Medium

194 of 315

Understanding +4 | -1

On what basis, do the fibrous and globular proteins are classified?

View answer and explanation

Correct option: B

On the basis of their molecular shape

Option B is correct because fibrous and globular proteins are classified based on their three-dimensional molecular shape, with fibrous proteins being elongated and globular proteins being spherical.

195 Medium

195 of 315

Remembering +4 | -1

In fibrous proteins, polypeptide chains are held together by

View answer and explanation

Correct option: C

hydrogen bonds

Option C (hydrogen bonds) is correct because hydrogen bonds are a primary force holding polypeptide chains together in fibrous proteins, along with disulfide bonds.

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196 Medium

196 of 315

Analyzing +4 | -1

Which of the following nucleotide sequences contains 4 pyrimidine bases?

View answer and explanation

Correct option: A

GATCAATGC

The correct answer is A (GATCAATGC) because it contains 4 pyrimidine bases (T and C).

197 Medium

197 of 315

Analyzing +4 | -1

Consider the following polypeptide.

Gly - Ala - Val - Gly - Leu - Ile - Asp - Gly

After hydrolysis the number of different optically active amino acids obtained are

{x}

and different optically inactive amino acids are

y

then find

\frac{x}{y}

View answer and explanation

Correct option: A

Option A (5) is correct because after hydrolysis, there are 5 optically active amino acids and 1 optically inactive amino acid, resulting in a ratio of 5/1 = 5.

198 Easy

198 of 315

Remembering +4 | -1

A mixture of amylose and amylopectin is called

View answer and explanation

Correct option: B

Starch

Option B (Starch) is correct because starch is a polysaccharide composed of amylose and amylopectin.

199 Medium

199 of 315

Remembering +4 | -1

Cofactors (non-proteinic prosthetic groups) used to bond conjugated proteins are:

View answer and explanation

Correct option: D

All are correct

Option D (All are correct) is correct because carbohydrates, phosphoric acid, and iron pigments can all serve as cofactors (non-protein prosthetic groups) in conjugated proteins.

200 Easy

200 of 315

Remembering +4 | -1

Oils contain a higher percentage of :

View answer and explanation

Correct option: C

Olein

Option C (Olein) is correct because oils typically contain a higher percentage of olein, which is a triglyceride derived from oleic acid, an unsaturated fatty acid.

201 Easy

201 of 315

Remembering +4 | -1

Gums are:

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because gums are polysaccharides, used as thickening agents, and improve texture in the food industry.

202 Hard

202 of 315

Understanding +4 | -1

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Amylose is insoluble in water.
Reason R : Amylose is a long linear molecule with more than 200 glucose units. In the light of the above statements, choose the correct answer from the options given below.

View answer and explanation

Correct option: D

A is not correct but R is correct

Option D is correct because Amylose is soluble in water, making the assertion incorrect, while the reason stating that amylose is a long linear molecule is correct.

203 Easy

203 of 315

Remembering +4 | -1

Which is not a poison for enzymes?

View answer and explanation

Correct option: B

\mathrm{F}{\mathrm{e}^{3 + }}

Option B (

\mathrm{F}{\mathrm{e}^{3 + }}

) is correct because while iron can be involved in enzyme active sites,

Fe^{3+}

itself is not generally considered a direct enzyme poison in the same way as cyanide, lead, or arsenate.

204 Medium

204 of 315

Remembering +4 | -1

Select the base which is not common between DNA and RNA

View answer and explanation

Correct option: D

Uracil (U)

Option D (Uracil (U)) is correct because Uracil is a nitrogenous base found in RNA but not in DNA, where it is replaced by Thymine.

205 Easy

205 of 315

Remembering +4 | -1

Deficiency of which vitamin causes scurvy?

View answer and explanation

Correct option: C

Vitamin C

Option C (Vitamin C) is correct because deficiency of Vitamin C causes scurvy.

206 Easy

206 of 315

Understanding +4 | -1

Which are not the essential constituents of balanced diet?

View answer and explanation

Correct option: D

Hormones

Option D (Hormones) is correct because hormones, while essential for bodily functions, are not considered essential constituents of a balanced diet in the same way as carbohydrates, fats, and proteins.

207 Easy

207 of 315

Remembering +4 | -1

When vegetable oils react with hydrogen in presence of finely divided nickel catalyst we get:

View answer and explanation

Correct option: A

Saturated fat

Option A (Saturated fat) is correct because hydrogenation of vegetable oils in the presence of a nickel catalyst leads to the formation of saturated fats.

208 Medium

208 of 315

Remembering +4 | -1

Which of the following terms indicates to the arrangement of different protein subunits in a multiprotein complex?

View answer and explanation

Correct option: D

quaternary structure

Option D (quaternary structure) is correct because quaternary structure describes the arrangement of multiple protein subunits in a multi-protein complex.

209 Easy

209 of 315

Remembering +4 | -1

Proteins are composed of:

View answer and explanation

Correct option: D

Amino acids

Option D (Amino acids) is correct because proteins are polymers made up of amino acid monomers linked by peptide bonds.

210 Easy

210 of 315

Remembering +4 | -1

Which of the following compounds are not used as disinfectants?
(A) Chloroxylenol
(B) Bithional
(C) Veronal
(D) Prontosil
(E) Terpineol
Choose the correct answer from the options given below:

View answer and explanation

Correct option: B

C, D

Option B (C, D) is the correct answer because Veronal and Prontosil are not used as disinfectants; they serve other purposes (Veronal is a barbiturate, and Prontosil is a prodrug antibacterial).

Revision notes and key takeaways

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

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Biomolecules practice · Mixed difficulty

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