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JEE • CHEMISTRY • BIOMOLECULES

Biomolecules practice · Hard

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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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1 Hard

1 of 15

Remembering +4 | -1

Identify the essential amino acids from below:

(A) Valine
(B) Proline

(C) Lysine
(D) Threonine

(E) Tyrosine

Choose the correct answer from the options given
below:

View answer and explanation

Correct option: A

(A),(C) and (D) only

Option A ((A),(C) and (D) only) is correct because Valine, Lysine, and Threonine are essential amino acids that cannot be synthesized by the human body and must be obtained from the diet.

2 Hard

2 of 15

Remembering +4 | -1

The function of glucose is to

View answer and explanation

Correct option: A

provides energy

Option A (provides energy) is correct because glucose is the primary source of energy for the body.

3 Hard

3 of 15

Remembering +4 | -1

The bonds between Guanine and Cytosine

View answer and explanation

Correct option: B

3-H bonds

Option B (3-H bonds) is correct because Guanine and Cytosine are bonded by three hydrogen bonds in DNA structure.

4 Hard

4 of 15

Remembering +4 | -1

Which one of the following compounds is found abudnantly in nature?

View answer and explanation

Correct option: D

Cellulose

Option D (Cellulose) is correct because cellulose is the most abundant organic compound in nature, forming the structural component of plant cell walls.

5 Hard

5 of 15

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

6 Hard

6 of 15

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.

7 Hard

7 of 15

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.

8 Hard

8 of 15

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.

9 Hard

9 of 15

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

10 Hard

10 of 15

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.

11 Hard

11 of 15

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.

12 Hard

12 of 15

Remembering +4 | -1

What does '

D

' and

(+)

signifies in

D-(+)

-glucose?

View answer and explanation

Correct option: B

D represents configuration and

(+)

represents the dextrorotatory nature of molecule

Option B (D represents configuration and (+) represents the dextrorotatory nature of molecule) is correct because 'D' indicates the configuration at the chiral carbon farthest from the aldehyde or ketone group, and '(+)' indicates that the molecule rotates plane-polarized light clockwise (dextrorotatory).

13 Hard

13 of 15

Remembering +4 | -1

Purines possess nitrogen at

View answer and explanation

Correct option: C

1, 3, 7 and 9 position

Option C (1, 3, 7 and 9 position) is correct because the purine ring system has nitrogen atoms at positions 1, 3, 7, and 9.

14 Hard

14 of 15

Understanding +4 | -1

The biomolecules which are acid insoluble fraction and molecular weight more than 10000 daltons are

(I) Polysaccharides

(II) Nucleic acids

(III) Lipids

(IV) Proteins

View answer and explanation

Correct option: D

I, II, IV

The correct answer is D (I, II, IV) because polysaccharides, nucleic acids, and proteins have molecular weights greater than 10000 daltons and are acid-insoluble, while lipids, although acid-insoluble, generally have lower molecular weights.

15 Hard

15 of 15

Remembering +4 | -1

DNA and RNA are different molecules as:

View answer and explanation

Correct option: D

DNA has thymine and RNA has uracil

Option D (DNA has thymine and RNA has uracil) is correct because DNA contains the nitrogenous base thymine (T), while RNA contains uracil (U) instead of thymine.

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Revision notes and key takeaways

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

Key Takeaways

✓ This set contains 15 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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