Class 12 Chemistry Chapter 14 Biomolecules MCQ Questions with Answers

Biomolecules Class 12 MCQ are one of the best strategies to prepare for the CBSE Class 12 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQ on Biomolecules class 12 which will help them all through their board test.

Biomolecules Class 12 MCQ Questions with Answers

Class 12 Chemistry MCQ with answers are given here to chapter the Amines. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Chemistry syllabus. By Solving these Class 12 MCQ, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

Learn Class 12 Biomolecules MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Biomolecules Class 12 MCQ with answers given below.

Question 1. The difference between amylose and amylopectin is   
(a) amylopectin have 1 → 4 a-linkage and 1 → 6 a-linkage
(b) amylose have 1 → 4 a-linkage and 1 → 6 b-linkage
(c) amylopectin have 1 → 4 a-linkage and 1 → 6 b-linkage
(d) amylose is made up of glucose and galactose.

Question 2. The function of enzymes in the living system is to 
(a) catalyse biochemical reactions
(b) provide energy
(c) transport oxygen
(d) provide immunity. 

Question 3. Deficiency of vitamin B1 causes the disease           
(a) convulsions
(b) beri-beri
(c) cheilosis
(d) sterility. 

Question 4. Which one of the following statements is not true regarding (+)–lactose? 
(a) On hydrolysis (+)–lactose gives equal amount of D(+)–glucose and D(+)–galactose.
(b) (+)–Lactose is a b-glucoside formed by the union of a molecule of D(+)–glucose and a molecule of D(+)–galactose.
(c) (+)–Lactose is a reducing sugar and does not exhibit mutarotation.
(d) (+)–Lactose, C₁₂H₂₂O₁₁ contains 8 –OH groups.

Question 5. Which of the following hormones contains iodine?   
(a) Testosterone
(b) Adrenaline
(c) Thyroxine
(d) Insulin 

Question 6. Which one given below is a non-reducing sugar?
(a) Glucose
(b) Sucrose
(c) Maltose
(d) Lactose

Question 7. Fructose reduces Tollens’ reagent due to   
(a) asymmetric carbons
(b) primary alcoholic group
(c) secondary alcoholic group
(d) enolisation of fructose followed by conversion to aldehyde by base. 

Question 8. Number of chiral carbons in b-D-(+) glucose is 
(a) five
(b) six
(c) three
(d) four. 

Question 9. Which one of the following is a peptide hormone? 
(a) Adrenaline
(b) Glucagon
(c) Testosterone
(d) Thyroxine

Question 10. Which one of the following does not exhibit the phenomenon of mutarotation? 
(a) (+)–Sucrose
(b) (+)–Lactose
(c) (+)–Maltose
(d) (–)–Fructose

Question 11. Which of the following statements about enzymes is true? 
(a) Enzymes catalyse chemical reactions by increasing the activation energy.
(b) Enzymes are highly specific both in binding chiral substrates and in catalysing their reactions.
(c) Enzymes lack in nucleophilic groups.
(d) Pepsin is proteolytic enzyme.

Question 12. Enzymes take part in a reaction and 
(a) decrease the rate of a chemical reaction
(b) increase the rate of a chemical reaction
(c) both (a) and (b)
(d) none of these.

Question 13. Glycolysis is 
(a) oxidation of glucose to glutamate
(b) conversion of pyruvate to citrate
(c) oxidation of glucose to pyruvate
(d) conversion of glucose to haem. 

Question 14. RNA and DNA are chiral molecules, their chirality is due to
(a) chiral bases
(b) chiral phosphate ester units
(c) D-sugar component
(d) L-sugar component. 

Question 15. Cellulose is polymer of
(a) glucose
(b) fructose
(c) ribose
(d) sucrose. 

Question 16. Which of the following gives positive Fehling solution test? 
(a) Sucrose
(b) Glucose
(c) Fats (d) Protein 

Question 17. Which one of the following statements is true? 
(a) Saponification of oil yields a diol
(b) Drying ofoil involves hydrolysis
(c) Addition of antioxidant to oil minimises rancidity
(d) Refining of oil involves hydrogenation     

Question 18. Which base is present in RNA but not in DNA ?
(a) Uracil
(b) Cytosine
(c) Guanine
(d) Thymine     

Question 19. Chargaff’s rule states that in an organism 
(a) amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C)
(b) amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C)
(c) amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G)
(d) amounts of all bases are equal. 

Question 20. Lipids are
(a) nucleic acids occurring in plants
(b) proteins occurring in animals
(c) carbohydrates occurring in plants
(d) fats of natural origin   

Question 21. Which functional group participates in disulphide bond formation in proteins?
(a) Thiolacetone
(b) Thiol
(c) Thioether
(d) Thioester       

Question 22. The purine base present in RNA is 
(a) guanine
(b) thymine
(c) cytosine
(d) uracil     

Question 23. Which one of the following is not present in RNA?
(a) Uracil
(b) Thymine 
(c) Ribose
(d) Phosphate     

Question 25. The pyrimidine bases present in DNA are
(a) cytosine and adenine
(b) cytosine and guanine
(c) cytosine and thymine
(d) cytosine and uracil     

Question 26. There are 20 naturally occurring amino acids.The maximum number of tripeptides that can be obtained is
(a) 8000
(b) 6470
(c) 7465
(d) 5360       

Question 27. Which of the following is not present in a nucleotide?
(a) Cytosine
(b) Guanine
(c) Adenine
(d) Tyrosine     

Question 28. In both DNA and RNA, heterocylic base and phosphate ester linkages are at 
(a) C’₅ and C’₁  respectively of the sugar molecule
(b) C’₁  and C’₅  respectively of the sugar molecule
(c) C’₂  and C’₅  respectively of the sugar molecule
(d) C’₅  and C’₂  respectively of the sugar molecule 

Question 29. How many hydrogen bonds are present between pair of thymine and adenine in DNA ? 
(a) 1-hydrogen bond
(b) 2-hydrogen bonds
(c) 3-hydrogen bonds
(d) No bonds occur     

Question 30. Which one of the following bases is not present in DNA?
(a) Quinoline
(b) Adenine 
(c) Cytosine
(d) Thymine       

Whoever needs to take the CBSE Class 12 Board Exam should look at this MCQ. To the Students who will show up in CBSE Class 12 Chemistry Board Exams, It is suggested to practice more and more questions. Aside from the sample paper you more likely had solved. These Class 12 Amines MCQ Questions with Answers are ready by the subject specialists themselves.

Question 31. In biological systems, the RNA molecules direct the synthesis of specific proteins which are characteristics of each kinds of organism. This process is known as
(a) transcription
(b) mutation 
(c) replication
(d) translation
(e) flocculation   

Question 32. Night-blindness may be caused by the deficiency of vitamin 
(a) A
(b) B
(c) C
(d) D     

Question 33. A substance forms Zwitter ion. It can have functional groups 
(a) —NH₂ , —COOH
(b) —NH₂, —SO₃H
(c) Both (a) and (b)
(d) None of the above   

Question 34. Match the following Columns.

Column I	Column II
A. Vitamin B12	1. Sterility
B. Vitamin B6	2. Haemorrhagic Condition
C. Vitamin E	3. Pernicious anaemia
D. Vitamin K	4. Skin disease

Codes
     A B C D
(a) 1 2 3 4
(b) 2 3 4 1
(c) 3 4 1 2
(d) 3 4 2 1     

Question 35. Sanger’s method is used to identify
(a) C-terminal amino acid
(b) N-terminal amino acid
(c) side chain
(d) molecular weight protein       

Question 36. Helical structure of protein is stablilised by
(a) peptide bond
(b) hydrogen bond
(c) van der Waals’ force
(d) dipole association     

Question 37. The chemical name of vitamin B₁ is
(a) ascorbic acid
(b) riboflavin
(c) pyridoxine
(d) thiamine     

Question 38. a-D-glucose and b-D-glucose are
(a) epimers
(b) anomers
(c) enantiomers
(d) diastereomers. 

Question 39. Which of the following is the sweetest sugar?
(a) Fructose
(b) Glucose
(c) Sucrose
(d) Maltose 

Question 40. Glucose molecule reacts with X number of molecules of phenyl hydrazine to yield osazone. The value of X is 
(a) two
(b) one
(c) four
(d) three. 

Question 41. Match the following Columns.

Column I	Column II
A. Vitamin A	1. Scurvy
B. Vitamin B12	2. hemorrhagic Condition
C. Viitamin C	3. Sterlity
D. Vitamin E	4. Xerophthalmia
E. Vitamin K	5. Pernicious anaemia

Codes
     A  B  C  D  E
(a) 3  4  5  2  1
(b) 3  4  5  1  2
(c) 4  5  1  3  2
(d) 3  5  4  2  2
(e) 4  5  3  1  2         

Question 42. Which of the following compounds is not of the lipid series ? 
(a) Fat
(c) Oil
(b) Soap
(d) Lard     

Question 43. The oxidation of glucose is one of the most important reactions in a living cell. What is the number of ATP molecules generated in cells from one molecule of glucose?
(a) 28
(b) 38
(c) 12
(d) 18 

Question 44. Which one of the following sets of monosaccharides forms sucrose?
(a) a-D-galactopyranose and a-D-glucopyranose
(b) a-D-glucopyranose and b-D-fructofuranose
(c) b-D-glucopyranose and a-D-fructofuranose
(d) a-D-glucopyranose and b-D-fructopyranose

Question 45. In DNA, the linkages between different nitrogenous bases are
(a) phosphate linkage
(b) H-bonding
(c) glycosidic linkage
(d) peptide linkage. 

Question 46. The a-D-glucose and b-D-glucose differ from each other due to difference in carbon atom with respect to its 
(a) number of OH groups
(b) size of hemiacetal ring
(c) conformation
(d) configuration. 

Question 47. The correct statement regarding RNA and DNA, respectively is
(a) the sugar component in RNA is a arabinose and the sugar component in DNA is ribose
(b) the sugar component in RNA is 2′-deoxyribose and the sugar component in DNA is arabinose
(c) the sugar component in RNA is arabinose and the sugar component in DNA is 2′-deoxyribose
(d) the sugar component in RNA is ribose and the sugar component in DNA is 2′-deoxyribose.

Question 48. Which of the following is an amine hormone?
(a) Insulin
(b) Progesterone
(c) Thyroxine
(d) Oxypurin

Question 49. Which of the following is a basic amino acid? 
(a) Serine
(b) Alanine
(c) Tyrosine
(d) Lysine 

Question 50. The segment of DNA which acts as the instrumental manual for the synthesis of the protein is
(a) ribose
(b) gene
(c) nucleoside
(d) nucleotide. 

Question 51. Chemically considering digestion is basically
(a) anabolism
(b) hydrogenation
(c) hydrolysis
(d) dehydrogenation.

Question 52. Which of the following compounds can form a zwitter ion? 
(a) Aniline
(b) Acetanilide
(c) Benzoic acid
(d) Glycine

Question 53. The hormone that helps in the conversion of glucose to glycogen is
(a) cortisone
(b) bile acids
(c) adrenaline
(d) insulin. 

Question 54. The non-essential amino acid among the following is
(a) lysine
(b) valine
(c) leucine
(d) alanine.

Question 55. Which structure(s) of proteins remain(s) intact during denaturation process?
(a) Both secondary and tertiary structures
(b) Primary structure only
(c) Secondary structure only
(d) Tertiary structure only 

Question 56. Which of the statements about “Denaturation” given below are correct?
(1) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
(2) Denaturation leads to the conversion of double strand of DNA into single strand.
(3) Denaturation affects primary structure which gets distorted.
(a) (2) and (3)
(b) (1) and (3)
(c) (1) and (2)
(d) (1), (2) and (3)

Question 57. On hydrolysis of starch, we finally get
(a) glucose
(b) fructose
(c) both (a) and (b)
(d) sucrose.

Question 58. Which functional group participates in disulphide bond formation in proteins? 
(a) Thioester
(b) Thioether
(c) Thio
l (d) Thiolactone

Question 59. The cell membranes are mainly composed of 
(a) fats
(b) proteins
(c) phospholipids
(d) carbohydrates. 

Question 60. In a protein molecule various amino acids are linked together by
(a) peptide bond
(b) dative bond
(c) a-glycosidic bond
(d) b-glycosidic bond. 

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