A disaccharide of D-Glucose and L-fructose

A disaccharide of L-glucose and L-fructose

A disaccharide of L-glucose and D-fructose

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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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121 Hard

121 of 315

Understanding +4 | -1

A chemist isolated a protein from crab and wanted to determine its molecular weight. Which of the following method would have given the best result for him?

View answer and explanation

Correct option: D

Osmotic pressure method

Option D (Osmotic pressure method) is correct because osmotic pressure is more sensitive for determining the molecular weights of macromolecules like proteins.

122 Medium

122 of 315

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.

123 Medium

123 of 315

Remembering +4 | -1

Which element is absent in protein?

View answer and explanation

Correct option: D

P

Option D (

P

) is correct because while proteins contain carbon, nitrogen, sulfur, and oxygen, they do not generally contain phosphorus.

124 Easy

124 of 315

Remembering +4 | -1

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone is called

View answer and explanation

Correct option: A

monosaccharide

Option A (monosaccharide) is correct because monosaccharides are the simplest carbohydrates and cannot be further hydrolyzed.

125 Easy

125 of 315

Remembering +4 | -1

A compound which catalyses a chemical reaction in a living organism is called a/an:

View answer and explanation

Correct option: B

Enzyme

Option B (Enzyme) is correct because enzymes are biological catalysts that speed up chemical reactions in living organisms.

126 Medium

126 of 315

Analyzing +4 | -1

Assertion (A): Acetic acid is a carbohydrate.

Reason (R): Acetic acid fits into general formula of carbohydrate, i.e.

{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.

127 Easy

127 of 315

Remembering +4 | -1

Which is fat soluble vitamin?

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Correct option: A

Vitamin A

Option A (Vitamin A) is correct because Vitamins A, D, E, and K are fat-soluble, while Pyridoxin (Vitamin B6), Riboflavin (Vitamin B2), and Thiamine (Vitamin B1) are water-soluble.

128 Easy

128 of 315

Remembering +4 | -1

Glycogen is:

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Correct option: D

Polysaccharide

The correct answer is D (Polysaccharide) because glycogen is a complex carbohydrate made up of many glucose units.

129 Hard

129 of 315

Analyzing +4 | -1

Which of the following statements are false regarding the nature of amino acids?

A. The acidity and neutrality of amino acids is based on number of amino and carboxyl groups.

B. Both

\mathrm{NH}_2

and

\mathrm{COOH}

groups of amino acids show ionizable nature.

C. In solutions of different

\mathrm{pH}

, the structure of amino acids does not change.

D. The amino acids have amino group and aldehyde group as substituents on the same carbon.

View answer and explanation

Correct option: B

\mathrm{CD}

Option B (CD) is correct because statements C and D are false regarding the nature of amino acids.

130 Easy

130 of 315

Remembering +4 | -1

Fehling’s solution and benedict’s solution are reduced by glucose to form:

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Correct option: B

\mathrm{C}{\mathrm{u}_2}\mathrm{O}

Option B (

\mathrm{C}{\mathrm{u}_2}\mathrm{O}

) is correct because glucose reduces Cu²⁺ ions in Fehling's and Benedict's solutions to Cu⁺, forming cuprous oxide (

\mathrm{C}{\mathrm{u}_2}\mathrm{O}

), which is a red precipitate.

131 Medium

131 of 315

Remembering +4 | -1

DNA and RNA contain four bases each. Which of the following bases is not present in RNA?

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Correct option: C

Thymine

Option C (Thymine) is correct because RNA contains Uracil instead of Thymine, which is present in DNA.

132 Medium

132 of 315

Understanding +4 | -1

Which one of the following statements is not true about enzymes?

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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.

133 Medium

133 of 315

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

\mathrm{A}

and

\mathrm{R}

are correct;

\mathrm{R}

is not the correct explanation of

A

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.

134 Medium

134 of 315

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.

135 Medium

135 of 315

Remembering +4 | -1

\alpha -

maltose consists of

View answer and explanation

Correct option: D

Two

\alpha - \mathrm{D} -

lucopyranose units with 1-4 glycosidic linkage

Option D is correct because

\alpha -

maltose is composed of two

\alpha - \mathrm{D} -

glucose units linked by a 1-4 glycosidic bond.

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136 Medium

136 of 315

Remembering +4 | -1

Linseed oil is:

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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.

137 Medium

137 of 315

Remembering +4 | -1

Compound

A

gives D-galactose and D-glucose on hydrolysis. The compound

A

View answer and explanation

Correct option: D

lactose

Option D (lactose) is correct because lactose, upon hydrolysis, yields D-galactose and D-glucose.

138 Easy

138 of 315

Remembering +4 | -1

The non-proteinous substances which certain enzymes require for their activity are called:

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Correct option: C

Co-enzymes

Option C (Co-enzymes) is correct because co-enzymes are non-protein substances required by certain enzymes for their activity.

139 Hard

139 of 315

Understanding +4 | -1

Which of the following statements regarding

\alpha

- amino acids are correct

I. Proteins on hydrolysis gives only

\alpha

amino acids.

II. Gln stands for Glutamic acid

III. Amino acids with equal number of amino and carboxyl groups are neutral amino acids

IV. All naturally occurring

\alpha

- amino acids are optically active.

View answer and explanation

Correct option: A

\&

III

Option A (I

\& III) is correct because proteins yield only alpha-amino acids upon hydrolysis, and amino acids with an equal number of amino and carboxyl groups are neutral.

140 Medium

140 of 315

Analyzing +4 | -1

Assertion(A):

\beta

-glycosidic linkage is present in maltose.

Reason (R): Maltose is composed of two glucose units in which

\mathrm{C}-1

of one glucose unit is linked to

\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.

141 Medium

141 of 315

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.

142 Easy

142 of 315

Remembering +4 | -1

The number of amino acids in insulin is

View answer and explanation

Correct option: C

Option C (51) is correct because the number of amino acids in insulin is 51.

143 Medium

143 of 315

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?

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Correct option: C

Option C (6) is correct because there are 6 possible arrangements of the three different amino acids in a tripeptide.

144 Medium

144 of 315

Remembering +4 | -1

Thiamine and pyridoxine are also known respectively as

View answer and explanation

Correct option: D

Vitamin

{B_1}

and Vitamin

{B_6}

Correct Answer + Core Reason: Option C (

B_1

and

B_6

) is correct because thiamine is vitamin

B_1

and pyridoxine is vitamin

B_6

145 Medium

145 of 315

Understanding +4 | -1

Pick up the correct statement about the denaturation of protein.

View answer and explanation

Correct option: B

During denaturation

2^{\circ}

and

3^{\circ}

structures of proteins are destroyed but

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.

146 Medium

146 of 315

Remembering +4 | -1

Which of the following is a linear polymer?

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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.

147 Easy

147 of 315

Remembering +4 | -1

Iodine test is shown by

View answer and explanation

Correct option: B

Starch

Option B (Starch) is correct because starch gives a blue-black color with iodine due to the formation of a complex.

148 Medium

148 of 315

Understanding +4 | -1

Assertion (A): Disruption of the natural structure of a protein is called denaturation.

Reason (R): During denaturation

3^{\circ}

and

2^{\circ}

structures of protein changed to

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^{\circ}

and

2^{\circ}

structures, converting them into the

1^{\circ}

structure.

149 Easy

149 of 315

Remembering +4 | -1

Which of the following gives reddish brown precipitate with dilute solution of resorcinol in dilute HCl?

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Correct option: B

Fructose

Option B (Fructose) is correct because fructose gives a reddish-brown precipitate with resorcinol in dilute HCl in the Seliwanoff's test.

150 Easy

150 of 315

Understanding +4 | -1

The function of DNA is:

View answer and explanation

Correct option: A

To synthesize RNA

Option D (All are correct) is correct because DNA synthesizes RNA, synthesizes necessary proteins, and carries hereditary characteristics.

Revision notes and key takeaways

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

Showing 121-150 of 315 questions

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Biomolecules practice · Mixed difficulty

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