Mixture of various hydrocarbons

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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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241 Easy

241 of 315

Remembering +4 | -1

Which of the following is absent in DNA?

View answer and explanation

Correct option: A

\mathrm{U}

Option A (U) is correct because Uracil (U) is a nitrogenous base found in RNA, not DNA, where Thymine (T) is present instead.

242 Hard

242 of 315

Remembering +4 | -1

Which one of the following peak absorption range of ultraviolet light by heterocyclic bases (nitrogen bases)

View answer and explanation

Correct option: D

260 \mathrm{~nm}

Option D (

260 \mathrm{~nm}

) is correct because heterocyclic bases (nitrogen bases) in DNA and RNA exhibit maximum UV absorption at approximately 260 nm.

243 Medium

243 of 315

Remembering +4 | -1

The purine base present in RNA is

View answer and explanation

Correct option: A

Guanine

Option A (Guanine) is correct because Guanine is a purine base found in both DNA and RNA.

244 Easy

244 of 315

Remembering +4 | -1

Night blindness is caused by deficiency of vitamin :

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Correct option: B

\mathrm{Vit}-\mathrm{A}

Option B (Vit-A) is correct because Vitamin A (retinol) is essential for the formation of rhodopsin, a light-sensitive pigment in the retina, and its deficiency leads to night blindness.

245 Easy

245 of 315

Understanding +4 | -1

A nanopeptide contains ……. peptide linkages.

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Correct option: B

Option B (8) is correct because a nanopeptide, consisting of 9 amino acids, will have 8 peptide linkages.

246 Easy

246 of 315

Application +4 | -1

There are 20 naturally occurring amino acids. The maximum number of tripeptides that can be obtained is

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Correct option: A

8000

Option A (8000) is correct because with 20 amino acids, the number of tripeptides is 20*20*20 = 8000.

247 Medium

247 of 315

Understanding +4 | -1

Vitamin C must be supplied regularly in diet because

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Correct option: A

it is water soluble hence excreted in urine and can’t be stored in the body

Option A (it is water soluble hence excreted in urine and can’t be stored in the body) is correct because Vitamin C is water-soluble and cannot be stored in the body, requiring regular intake.

248 Easy

248 of 315

Remembering +4 | -1

The polymer formed with more than two monosaccharides units is known as:

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Correct option: B

Polysaccharide

Option B (Polysaccharide) is correct because polysaccharides are polymers composed of more than two monosaccharide units.

249 Easy

249 of 315

Remembering +4 | -1

Which of the following carbohydrates is synthesized by nature on the largest scale?

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Correct option: D

Cellulose

Option D (Cellulose) is correct because cellulose is the most abundant organic polymer on Earth, synthesized by plants on a massive scale.

250 Medium

250 of 315

Remembering +4 | -1

On what basis are the manosaccharides classified?

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Correct option: D

Number of

\mathrm{C}

-atoms and the functional group present in them

Option D (Number of

\mathrm{C}

-atoms and the functional group present in them) is correct because monosaccharides are classified based on the number of carbon atoms they contain and the type of carbonyl group (aldehyde or ketone) present.

251 Medium

251 of 315

Remembering +4 | -1

The base adenine occurs in which among the following.

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Correct option: C

DNA and RNA both

Option C (DNA and RNA both) is correct because adenine is one of the five main nucleobases used in forming nucleic acids, and it is found in both DNA and RNA.

252 Medium

252 of 315

Remembering +4 | -1

Non-essential amino acid among the following is

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Correct option: B

Glutamine

Option B (Glutamine) is correct because glutamine is a non-essential amino acid, meaning the human body can synthesize it.

253 Easy

253 of 315

Remembering +4 | -1

A source of oleic acid is:

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Correct option: B

Corn oil

Option B (Corn oil) is correct because corn oil is a significant source of oleic acid, a monounsaturated fatty acid.

254 Medium

254 of 315

Remembering +4 | -1

Essential oils are:

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Correct option: B

Pleasant smelling liquids occurring in plants

Option B (Pleasant smelling liquids occurring in plants) is correct because essential oils are volatile, aromatic liquids extracted from plants.

255 Easy

255 of 315

Remembering +4 | -1

Hardening of fat (lipid) is due to

View answer and explanation

Correct option: A

Hydrogenation

Option A (Hydrogenation) is correct because hardening of fat involves the addition of hydrogen to unsaturated fatty acids, converting them into saturated fatty acids.

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256 Medium

256 of 315

Understanding +4 | -1

Which of the following statements about enzymes are true?

1. Enzymes lack in nucleophilic groups.

II. Pepsin is proteolytic enzyme.

III. Enzymes catalyse chemical reactions enhances the rate of reaction by lowering the activation energy.

IV. Enzymes are highly specific both in binding chiral substrates and in catalysing their reactions.

View answer and explanation

Correct option: D

II, III and IV

Option D is correct because enzymes are indeed specific, catalyze reactions by lowering activation energy, and pepsin is a proteolytic enzyme.

257 Medium

257 of 315

Understanding +4 | -1

Assertion (A):

\alpha

-helix structure of proteins is in the shape of right handed screw.

Reason (R): There is hydrogen bond between the

> \mathrm{NH}

group of each amino acid to the

> =\mathrm{O}

of an adjacent turn of the helix.

View answer and explanation

Correct option: A

Both

\mathrm{A}

and

\mathrm{R}

are correct;

\mathrm{R}

is the correct explanation of

\mathrm{A}

Option A (Both

\mathrm{A}

and

\mathrm{R}

are correct;

\mathrm{R}

is the correct explanation of

\mathrm{A}

.) is correct because the alpha-helix structure is a right-handed screw stabilized by hydrogen bonds between the NH group of each amino acid and the CO group of an adjacent turn.

258 Easy

258 of 315

Remembering +4 | -1

One gram of fat gives:

View answer and explanation

Correct option: C

More than twice the energy as one gram of carbohydrate or protein

Option C (More than twice the energy as one gram of carbohydrate or protein) is correct because fats provide approximately 9 kcal/gram, while carbohydrates and proteins provide approximately 4 kcal/gram.

259 Easy

259 of 315

Remembering +4 | -1

Paraffin wax is not used:

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Correct option: C

In greases

Option C (In greases) is correct because paraffin wax is not typically used as a primary component in greases; greases usually consist of a lubricating oil thickened with a soap or other thickener.

260 Medium

260 of 315

Application +4 | -1

The maximum concentration of zwitter ion of given amino acid will be at

\mathop {N{H_3}}\limits_{\left( {{\text{pKa}} = 9.8} \right)}^ \oplus - C{H_2} - \mathop {C{O_2}H}\limits_{\left( {{\text{pK }}{{\text{a}}_{\text{1}}} = 2.3} \right)}

View answer and explanation

Correct option: C

6 (app.)

The correct answer is C (Increases by factor of four) because the rate is proportional to the square of the carbon monoxide concentration.

261 Medium

261 of 315

Remembering +4 | -1

The hormone produced by pancreas

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Correct option: B

Glucogen

Option B (Glucogen) is correct because the pancreas produces glucagon, a hormone that increases blood glucose levels.

262 Medium

262 of 315

Remembering +4 | -1

The RBC deficiency is deficiency disease of:

View answer and explanation

Correct option: C

\mathrm{Vitamin }{B_{12}}

Option C (

\mathrm{Vitamin }{B_{12}}

) is correct because a deficiency of Vitamin B12 causes pernicious anemia, which is characterized by a deficiency in red blood cells (RBC).

263 Medium

263 of 315

Remembering +4 | -1

One mole of sucrose on hydrolysis gives

View answer and explanation

Correct option: B

One mole of glucose and 1 mole of fructose

Option B (One mole of glucose and 1 mole of fructose) is correct because sucrose, upon hydrolysis, yields equimolar amounts of glucose and fructose.

264 Easy

264 of 315

Analyzing +4 | -1

Which of the following does not contain

{C}={O}

bond?

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Correct option: A

Adenine

Option A is correct because Adenine does not contain a

{C}={O}

bond, while Guanine, Thymine, and Uracil do.

265 Easy

265 of 315

Remembering +4 | -1

Aqueous solution of carbohydrate with 2 drops of alcoholic solution of

\alpha

-naphthol and

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

gives a ring at the junction. The colour of the ring is:

View answer and explanation

Correct option: C

Violet

Option C (Violet) is correct because the Molisch test, which uses

\alpha

-naphthol and sulfuric acid, produces a violet ring at the junction when carbohydrates are present.

266 Easy

266 of 315

Remembering +4 | -1

Hydrolysis of fats and oils in the body produces:

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Correct option: A

A fatty acid

Option A is correct because the hydrolysis of fats and oils yields fatty acids and glycerol.

267 Medium

267 of 315

Remembering +4 | -1

Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives

View answer and explanation

Correct option: C

1 molecule of glucose +1 molecule of fructose

Option C (1 molecule of glucose +1 molecule of fructose) is correct because sucrose, upon hydrolysis, yields one molecule of glucose and one molecule of fructose.

268 Medium

268 of 315

Understanding +4 | -1

Assertion(A): Sucrose is a reducing sugar.

Reason(R): On hydrolysis sucrose bring the change in sign of rotation from dextro(+) to laevo(-)
In the light of the above statements, choose the most appropriate answer from the options given below.

View answer and explanation

Correct option: C

A is not correct but R is correct

Option C (A is not correct but R is correct) is the correct answer because sucrose is a non-reducing sugar, but the reason regarding the change in sign of rotation upon hydrolysis is correct.

269 Medium

269 of 315

Remembering +4 | -1

Which functional group participates in disulphide bond formation in proteins?

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Correct option: B

Thiol

Option B (Thiol) is correct because thiol groups (-SH) are involved in the formation of disulfide bonds in proteins.

270 Easy

270 of 315

Remembering +4 | -1

Which one is a test for proteins?

View answer and explanation

Correct option: B

Biuret test

Option B (Biuret test) is correct because the Biuret test is a chemical test used for detecting the presence of peptide bonds, which are characteristic of proteins.

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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