Chapter 15 Biomolecules MCQs for Class 12 Chemistry

Chapter 15 Biomolecules MCQs for Class 12 Chemistry

Here students can practice Chapter 15 Biomolecules MCQs for Class 12 Chemistry. All the MCQs are divided into several sub-pages. Each page has 40 MCQs, for the next page just scroll down and click on the button. Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.

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Q 1.: Which nitrogen base is present in RNA, but not in DNA ?

(A) Thymine

(B) Cytosine

(C) Uracil

(D) Guanine

Option – C

Q 2.: Which sugar is present in RNA ?

(A) Fructose

(B) Glucose

(C) Deoxyribose

(D) Ribose

Option – D

Q 3.: Adenosine is an example of ________

(A) Purine base

(B) Nucleoside

(C) Nucleotide

(D) Pyrimidine base

Option – B

Q 4.: Purine nitrogen base attach to pentose sugar with position _______

(A) 7th

(B) 3rd

(C) 1st

(D) 9th

Option – D

Q 5.: Which is absent in nucleoside ?

(A) Phosphoric acid

(B) Nitrogen base

(C) Pentose sugar

(D) None of these

Option – A

Q 6.: Phosphodiester Linkage is present between _________

(A) Ribose and Phosphoric acid

(B) Two nucleoside

(C) Two nucleotide

(D) Nitrogen base and Pentose

Option – C

Q 7.: The number of Nitrogen atoms present in Guanine ________

(A) Five

(B) Four

(C) Three

(D) Two

Option – A

Q 8.: If one strand of DNA is 3’ AGGATCTGA 5’, then other strand will be :





Option – B

Q 9.: Replication is the property of ________


(B) Protein


(D) All of These

Option – C

Q 10.: What is gene?

(A) A segment of DNA

(B) A segment of RNA

(C) A segment of Protein

(D) All of these

Option – A

Q 11.: What is the charge present on DNA molecule ?

(A) Negative

(B) Positive

(C) Neutral

(D) Both A and B

Option – A

Q 12.: Zwitter ion formation is not a property of _________

(A) Amino acids



(D) Both ‘B’ and ‘C’

Option – D

Q 13.: If the sequence of triplets in DNA is 3’ CTGGTGTGAACC 5’, then the sequence of mRNA will be _______





Option – C

Q 14.: Central Dogma does not include :

(A) Replication

(B) Transpiration

(C) Translation

(D) Transcription

Option – B

Q 15.: On complete Hydrolysis of ATP, it give _________

(A) Adenosine and Phosphoric acid

(B) Adenine and Phosphoric acid

(C) Both ‘A’ and ‘B’

(D) Adenine, Pentose Sugar and Phosphoric acid

Option – D

Q 16.: Pentose sugar attach to phosphoric acid in the same nucleotide with position ______

(A) Five

(B) Four

(C) Three

(D) First

Option – A

Q 17.: Pentose sugar of one nucleotide attached to phosphoric acid of other nucleotide with position _________

(A) Five

(B) Four

(C) Three

(D) First

Option – C

Q 18.: The backbone of nucleic acids is made up of _________

(A) Nitrogen base and Pentose sugar

(B) Pentose sugar and Phosphoric acid

(C) Nitrogen base and Phosphoric acid

(D) All of these

Option – B

Q 19.: DNA fingerprinting is more reliable than ordinary thumb fingerprinting because :

(A) Fast method

(B) More accurate

(C) cannot be altered by any treatment

(D) Both ‘B’ and ‘C’

Option – D

Q 20.: Chargaff Rule does not state that :

(A) T + C = A + G

(B) A + T ÷ G + C = 1

(C) A + T ÷ G + C ≠ 1

(D) T + C ÷ A + T = 1

Option – B

Q 21. RNA is different from DNA due to have :

(A) Double stranded structure

(B) Deoxyribose sugar

(C) Thymine

(D) Uracil

Option – D

Q 22.: DNA is located in __________

(A) Nucleus

(B) Mitochondria

(C) Plastids

(D) All of These

Option – D

Q 23.: Which is not a function of DNA ?

(A) Synthesis carbohydrates

(B) Store genetic information

(C) Transcript RNA

(D) Evolution

Option – A

Q 24.: The genetic material of Virus is ______



(C) Either DNA or RNA but never both

(D) Both ‘A’ and ‘B’

Option – C

Q 25.: Thymine is held by two hydrogen bonds with the base :

(A) Guanine

(B) Adenine

(C) Cytosine

(D) Uracil

Option – B

Q 26.: A code has a sequence of ‘A’ and specifies a particular ‘B’ that is to be incorporated into ‘C’. What are A, B and C ?

(A) 3 Bases , Amino acid , Carbohydrate

(B) 3 Bases , Carbohydrate , Protein

(C) 3 Bases , Protein , Amino acids

(D) 3 Bases , Amino acids , Protein

Option – D

Q 27.: Which is not the correct statement about RNA and DNA ?

(A) DNA is active in virus where RNA never appears in virus

(B) DNA exists as dimer while RNA is usually single-stranded

(C) DNA contains deoxyribose as its sugar and RNA contains ribose

(D) RNA contains uracil in place of thymine as a nitrogen base.

Option – A

Q 28.: Which of the following contributes to the double helical structure of DNA ?

(A) Hydrogen bond

(B) Covalent bond

(C) Disulphide bond 

(D) Van der waals’ force

Option – A

Q 29.: In DNA, the complementary bases are :

(A) Adenine and Thymine  :  Guanine and Uracil

(B) Adenine and Thymine  :  Guanine and Cytosine

(C) Adenine and Guanine  :  Thymine and Cytosine

(D) Uracil and Adenine  :  Cytosine and Guanine

Option – B

Q 30.: DNA multiplication is called _______

(A) Translation

(B) Transduction

(C) Replication

(D) Transcription

Option – C

Q 31.: Which of the following is not present in a nucleotide ?

(A) Cytosine

(B) Guanine

(C) Adenine

(D) Tyrosine

Option – D

Q 32.: A base-sugar phosphate unit in nucleic acid is called _______

(A) Nucleoside

(B) Phosphide 

(C) Nucleotide

(D) None of these

Option – C

Q 33.: A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid ?

(A) Three

(B) Four

(C) One 

(D) Two

Option – A

Q 34.: The cell membranes are mainly composed of _______

(A) Carbohydrates

(B) Proteins

(C) Phospholipids

(D) Fats

Option – C

Q 35.: Which one of the following statements is true for protein synthesis (translation) ?

(A) Amino acids are directly recognised by mRNA

(B) The third base of the codon is less specific

(C) Only one codon codes for an amino acid

(D) Every tRNA molecule has more than one amino acid attachment.

Option – B

Q 36.: The phenomenon of mutation is :

(A) Chemical change in DNA molecule

(B) Production of macromolecules

(C) Synthesis of micro molecules

(D) Invasion of foreign microorganisms

Option – A

Q 37.: Important constituent of plant cell wall is _______

(A) Lipid

(B) Cellulose

(C) Protein

(D) Vitamin

Option – B

Q 38.: Glucose does not react with _____

(A) Bromine water

(B) Hydroxyl amine

(C) Ethanoic anhydride

(D) Sodium bisulphite

Option – D

Q 39.: The letter ‘D’ in D-glucose signifies

(A) Configuration of all chiral carbon

(B) Dextrorotatory

(C) That it is a monosaccharide

(D) Configuration at the penultimate chiral carbon

Option – D

Q 40.: Find out which one is non-sugar

(A) Sucrose

(B) Maltose

(C) Cellulose

(D) Lactose

Option – C


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We hope that these Chapter 15 Biomolecules MCQs for Class 12 Chemistry helped you in learning new concepts. All questions are based on NCERT syllabus and some of them have been asked in various competitive exams. You can go to the next pages to practice more for Chapter 15 Biomolecules MCQs for Class 12 Chemistry, click on the question range given above. 

Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.