MCQs For NCERT Class 12 Chemistry Chapter 14 Biomolecules

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Please refer to the MCQ Questions for Class 12 Chemistry Chapter 14 Biomolecules with Answers. The following Biomolecules Class 12 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 12. Our experts have designed MCQ Questions for Class 12 Chemistry with Answers for all chapters in your NCERT Class 12 Chemistry book.

Biomolecules Class 12 MCQ Questions with Answers

See below Biomolecules Class 12 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid? 
(a) Three
(b) Four
(c) One
(d) Two 

Question. Sucrose on hydrolysis gives 
(a) b-D-glucose + a-D-fructose
(b) a-D-glucose + b-D-glucose
(c) a-D-glucose + b-D-fructose
(d) a-D-fructose + b-D-fructose. 

Question. The correct statement in respect of protein haemoglobin is that it 
(a) functions as a catalyst for biological reactions
(b) maintains blood sugar level
(c) acts as an oxygen carrier in the blood
(d) forms antibodies and offers resistance to diseases.

Question. Which is the correct statement?   
(a) Starch is a polymer of a-glucose.
(b) Amylose is a component of cellulose.
(c) Proteins are composed of only one type of amino acid.
(d) In cyclic structure of fructose, there are four carbons and one oxygen atom. 

Question. Haemoglobin is 
(a) a vitamin
(b) a carbohydrate
(c) an enzyme
(d) a globular protein..

Question. Which one is responsible for production of energy in biochemical reaction?
(a) Thyroxine
(b) Adrenaline
(c) Oestrogen
(d) Progesterone

Question. The secondary structure of a protein refers to
(a) regular folding patterns of continuous portions of the polypeptide chain 
(b) three-dimensional structure, specially the bond between amino acid residues that are distant
from each other in the polypeptide chain
(c) mainly denatured proteins and structures of prosthetic groups
(d) linear sequence of amino acid residues in the polypeptide chain.

Question. Enzymes are made up of
(a) edible proteins
(b) proteins with specific structure
(c) nitrogen containing carbohydrates
(d) carbohydrates.

Question. Which of the following is correct?
(a) Cycloheptane is an aromatic compound.
(b) Diastase is an enzyme.
(c) Acetophenone is an ether.
(d) All of these. 

Question. The beta and alpha glucose have different specific rotations. When either is dissolved in water, their rotation changes until the same fixed value results. This is called 
(a) epimerisation
(b) racemisation
(c) anomerisation
(d) mutarotation

Question. Which of the following pairs give positive Tollen’s test?
(a) Glucose, sucrose 
(b) Glucose, fructose
(c) Hexanal, acetophenone
(d) Fructose, sucrose   

Question. If two isomers have been classified correctly as anomers, they may be also called 
(a) conformers
(b) enantiomers
(c) tautomers
(d) diastereomers       

Question. Which two of the following aldohexoses give the same osazone derivative?

(a) I and IV
(b) I and III
(c) II and III
(d) III and IV     

Question. The statement that is not correct is
(a) aldose or ketose sugars in alkaline medium do not isomerise
(b) carbohydrates are optically active
(c) penta acetate of glucose does not react with hydroxy !amine
(d) lactose has glycosidic linkage between C₄ of glucose and C₁ of galactose unit   

Question. The carbohydrate used as storage molecule in animal is
(a) sucrose
(b) glycogen 
(c) maltose
(d) glucose 
(e) fructose     

Question. Among the following statements about the molecules X and Y, the one(s) which is (are) correct?

(a) X and Y are diastereomers
(b) X and Y are enantiomers
(c) X and Y are both aldohexoses
(d) X is D-sugar and Y is L-sugar     

Question. The monosaccharide constituents of lactose are 
(a) α-D-glucose and β-D-fructose
(b) α-D-glucose
(c) β-D-glucose
(d) β-D-glucose and β-D-galactose   

Question. Which of the following compounds does not undergo mutarotation? 
(a) Glucose
(b) Sucrose
(c) Ribose
(d) Fructose     

Question. Synthesis of each molecule of glucose in photosynthesis involves 
(a) 18 molecules of ATP
(b) 10 molecules of ATP
(c) 8 molecules of ATP
(d) 6 molecules of ATP     

Question. Glucose reacts with methyl alcohol to give 
(a) α-methyl glucoside
(b) β-methyl glucoside
(c) Both (a) and (b)
(d) None of these     

Question. A certain compound gives negative test with ninhydrin and positive test with Benedict’s solution, it is 
(a) an amino acid
(b) a monosaccharide
(c) a lipid
(d) a protein     

Question. Which of the following is an aldohexose? 
(a) Cellulose
(b) Sucrose
(c) Glucose
(d) Raffinose     

Question. Which of the following is an example of ketohexose?
(a) Mannose 
(b) Galactose
(c) Maltose
(d) Fructose     

Question. Glucose and mannose are
(a) epimers
(b) anomers
(c) ketohexoses
(d) disaccharides     

Question. Which of the following compounds can be detected by Molisch’s test? 
(a) Nitro compounds
(b) Sugars
(c) Amines
(d) Primary alcohols       

Question. Which of the following tests is performed by carbohydrates?
(a) Biuret test
(b) Nitroprusside test
(c) Ninhydrin test
(d) Molisch’s test     

Question. Sucrose is not a reducing sugar since 
(a) it conains no free aldehyde or keto group adjacent to a CHOHgroup
(b) it is built up of a fructose unit
(c) it is optically active
(d) it is chemically stable     

Question. The change in the optical rotation of freshly prepared solution of glucose is known as 
(a) tautomerism
(b) racemisation
(c) specific rotation
(d) mutarotation   

Question. α -maltose consists of 
(a) one α-D-glucopyranose unit and one β-D- glucopyranose unit with 1-2 glyosidic linkage
(b) two α -D-glucopyranose units with 1-2 glycosidic linkage
(c) two β-D-glucopyranose units with 1-4 glycosidic linkage
(d) two α -D-glucopyranose units with 1-4 glycosidic linkage       

Question. Polysaccharides have which of the following linkage?
(a) Glycosidic linkage
(b) H-bond 
(c) Peptide linkage
(d) No linkage     

Question. The following carbohydrate is 

(a) a ketohexose
(b) an aldohexose
(c) an α-furanose
(d) an α-pyranose   

Question. If one strand of DNA has the sequence ATCGTATG, the sequence in the complementary strand would be:  
(a) TAGCTTAC
(b) TCACATAC
(c) TAGCATAC
(d) TACGATAC

Question. Fructose on reduction gives a mixture of two alcohols which are related as
(a) diastereomers
(b) epimers
(c) both (a) and (b)
(d) anomers.

Question. Which one of the following statements is true 
for protein synthesis (translation)?
(a) Amino acids are directly recognized by m-RNA
(b) The third base of the codon is less specific
(c) Only one codon codes for an amino acid
(d) Every t-RNA molecule has more than one amino acid attachement

Question. The pair in which both species have iron is :
(a) Nitrogenase, cytochromes 
(b) Carboxypeptidase, haemoglobin
(c) Haemocyanin, nitrogenase
(d) Haemoglobin, cytochromes

Question. Lysine is least soluble in water in the pH range:
(a) 3 to 4
(b) 5 to 6 
(c) 6 to 7
(d) 8 to 9

Question. Which of the statements about “Denaturation” given below are correct ?
(A) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
(B) Denturation leads to the conversion of double strand of DNA into single strand
(C) Denaturation affects primary structure which gets distorted Options :
(a) (B) and (C)
(b) (A) and (C)
(c) (A) and (B)
(d) (A), (B) and (C)

Question. Which one of the following statements is correct?
(a) All amino acids except lysine are optically active
(b) All amino acids are optically active 
(c) All amino acids except glycine are optically active
(d) All amino acids except glutamic acids are optically active

Question. α- D-(+)-glucose and β-D-(+)-glucose are
(a) conformers
(b) epimers
(c) anomers
(d) enatiomers

Question. Thymine is :
(a) 5-Methyluracil
(b) 4-Methyluracil
(c) 3-Methyluracil
(d) 1-Methyluracil

Question. Which of the following statement is not correct?
(a) Chlorophyll is responsible for the synthesis of carbohydrates in plants
(b) The compound formed by the addition of oxygen to haemoglobin is called oxyhaemoglobin
(c) Acetylsalicylic acid is known as aspirin
(d) The metal ion present in vitamin B₁₂ is Mg²⁺

Question. α-Amino acids are 
(a) acidic due to –COOH group and basic due to –NH₂ group
(b) acidic due to –NH³⁺ group and basic due to –COO^– group.
(c) neither acidic nor basic.
(d) none is true.

Question. Denaturation of proteins leads to loss of its biological activity by
(a) Formation of amino acids
(b) Loss of primary structure
(c) Loss of both primary and secondary structures
(d) Loss of both secondary and tertiary structures

Question. Glucose molecule reacts with X number of molecules of phenylhydrazine to yield osazone. 
The value of X is 
(a) three
(b) two
(c) one
(d) four

Question. Which of the following is not a fat soluble vitamin? 
(a) Vitamin B complex
(b) Vitamin D
(c) Vitamin E
(d) Vitamin A 

Question. Which of the following vitamins is water soluble? 
(a) Vitamin E
(b) Vitamin K
(c) Vitamin A
(d) Vitamin B 

Question. The human body does not produce
(a) enzymes
(b) DNA
(c) vitamins
(d) hormones.

Question. Vitamin B₁₂ contains 
(a) Fe (II)
(b) Co (III)
(c) Zn (II)
(d) Ca (II)

Question. The central dogma of molecular genetics states that the genetic information flows from
(a) Amino acids → Proteins → DNA
(b) DNA → Carbohydrates → Proteins
(c) DNA → RNA → Proteins
(d) DNA → RNA → Carbohydrates

Question. In DNA, the complimentary bases are 
(a) adenine and guanine; thymine and cytosine
(b) uracil and adenine; cytosine and guanine
(c) adenine and thymine; guanine and cytosine
(d) adenine and thymine; guanine and uracil.

Question. Which of the following is correct about H-bonding in nucleotide?
(a) A – T, G – C
(b) A – G , T – C
(c) G – T, A – C
(d) A – A, T – T

Question. An example of biopolymer is
(a) teflon
(b) neoprene
(c) nylon-6, 6
(d) DNA. 

Question. The couplings between base units of DNA is through
(a) hydrogen bonding
(b) electrostatic bonding
(c) covalent bonding
(d) van der Waals’ forces.

Question. The helical structure of protein is stabilised by
(a) dipeptide bonds
(b) hydrogen bonds
(c) ether bonds
(d) peptide bonds.

Question. Which is not true statement?
(a) a-Carbon of a-amino acid is asymmetric.
(b) All proteins are found in L-form.
(c) Human body can synthesise all proteins they need.
(d) At pH = 7 both amino and carboxylic groups exist in ionised form.

Question. Which of the following statements is not correct?
(a) Ovalbumin is a simple food reserve in eggwhite.
(b) Blood proteins thrombin and fibrinogen are involved in blood clotting.
(c) Denaturation makes the proteins more active. 
(d) Insulin maintains sugar level in the blood of a human body. 

Question. Which of the following hormones is produced under the conditions of stress which stimulate glycogenolysis in the liver of human beings?
(a) Thyroxin
(b) Insulin
(c) Adrenaline
(d) Estradiol 

Question. Phospholipids are esters of glycerol with
(a) three carboxylic acid residues
(b) two carboxylic acid residues and one phosphate group
(c) one carboxylic acid residue and two phosphate groups
(d) three phosphate groups. 

Question. The number of molecules of ATP produced in the lipid metabolism of a molecule of palmitic acid is     
(a) 56
(b) 36
(c) 130
(d) 86

Biomolecules Class 12 MCQ Questions with Answers will assist the student with understanding the chapter in a great way. Besides, these MCQs will fill in as the best revision materials during the class 12 board exam. Aside from MCQ of Biomolecules Class 12, we have also provided Biomolecules Class 12 Notes to assist students with ably planning for the board exam.

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