Biomolecules MCQ | Class 12 |Chemistry | Chapter-14 | 2024

Last updated on July 14th, 2024 at 05:41 pm

Biomolecules MCQ Chapter 14

Biomolecules are compounds which are produced by living cells in organisms

Below are some of the very important NCERT Biomolecules MCQ Class 12 Chemistry Chapter 14 with Answers. These Biomolecules MCQs have been prepared by expert teachers and subject experts based on the latest syllabus and pattern of CBSE Term 1 examination.

We have given these Biomolecules Class 12 Chemistry MCQs Questions with Answers to help students understand the concept.

MCQ Questions for Class 12 Chemistry are very important for the latest CBSE Term 1 and Term 2 pattern. These MCQs are very important for students who want to score high in CBSE Board, NEET and JEE exam. 

We have put together these NCERT MCQ Questions of Biomolecules for Class 12 Chemistry Chapter 14 with Answers for the practice on a regular basis to score high in exams. Refer to these MCQs Questions with Answers here along with a detailed explanation.

Note : – Answers after every 10 questions

MCQ (1-10)

1. Which one is a fibrous protein?
   1. Globulin
   2. Collagen 
   3. Hordein
   4. Gluten
2. The relation between glucose and galactose is that they are
   1. metamers 
   2. epimers
   3. anomers 
   4. homomers
3. Which of the following has maximum laevorotation?
   1. D-Fructose
   2. D-Glucose
   3. Sucrose
   4. Invert sugar
4. The human body does not produce
   1. enzymes
   2. DNA 
   3. vitamin
   4. hormones
5. The deficiency of Vitamin C causes
   1. scurvy
   2. rickets
   3. pyorrhea
   4. anaemia
6. The energy currency of the cell is
   1. ATP
   2. ADP
   3. AMP
   4. None of these
7. The helical structure of protein is stabilized by
   1. Dipeptide bonds
   2. Hydrogen bonds
   3. Ether bonds 
   4. Peptide bonds 
8. Which of the following is not a pyrimidine?
   1. Uracil
   2. Cytosine 
   3. Adenine 
   4. Guanine
9. The vitamin which is neither soluble in fat nor in water is
   1. biotin
   2. thiamine
   3. phylloquinone 
   4. pyridoxine
10. Invert sugar is 
    1. cellobiose
    2. maltose
    3. sucrose 
    4. lactose

Answers (1-10)

1 . (2)

Collagen is a fibrous protein which are thread like and occur either singly or in groups. It is insoluble in water.

2. (2)

Glusoce and galactose are epimers. Epimers are diasteriomers that contain more than one chiral center but differ from each other in the absolute configuration.

3. (1)

D-(+)-Glucose has a specific rotation of +52.5°

D-(-)-Fructose has a specific rotation of -92.4°

Invert sugar has a specific rotation of -39.9°

4. (3)

Vitamins are not produced by the body.

5. (1)

The deficiency of vitamin C causes scurvy.

6. (1)

The major energy currency molecule of the cell is ATP.

7. (2)

Hydrogen bonds

8. (4)

Guanine is a purine

9. (1)

Biotin, also called (vitamin H) is neither soluble in water nor in fat.

10. (3)

Invert sugar is sucrose

Biomolecules MCQ (11-20)

11. Cellobiose is a 
    1. monosaccharide
    2. polymer
    3. disaccharide
    4. trisaccharide
12. Zwitter ion is a
    1. neutral species 
    2. singly charged species
    3. doubly charged species
    4. multi functional species
13. Which of the following sugars is least sweet?
    1. Glucose
    2. Fructose
    3. Sucrose
    4. Maltose
14. The pyrimidine bases present in DNA are
    1. cytosine and thymine
    2. cytosine and adenine
    3. cytosine and guanine 
    4. cytosine and uracil
15. Simplest amino acid is
    1. valine
    2. glycine
    3. alanine
    4. leucine
16. The number of tripeptides formed by three different amino acids is 
    1. 3
    2. 4
    3. 5
    4. 6
17. The hormone that helps in the conversion of glucose into glycogen is
    1. cortisone
    2. bile acid
    3. adrenaline
    4. insulin
18. The best source of vitamin A is
    1. oranges
    2. beans
    3. carrot
    4. wheat
19. The sugar present in DNA is
    1. glucose
    2. deoxyribose
    3. ribose
    4. fructose
20. The hormone which controls the process of burning of fats, proteins and carbohydrates and liberate energy in the body is
    1. thyroxine
    2. adrenaline
    3. insulin
    4. cortisone

Answers (11-20)

11. (3)

Cellobiose is a disaccharide.

12. (3)

Zwitter ion is a doubly charged species.

13. (4)

Maltose is the least sweet.

14. (1)

The pyrimidine bases present in DNA are cytosine and thymine.

15. (2)

Glycine is the simplest amino acid and is found in animal protein.

16. (4)

The number of tripeptide bonds by three different amino acids as there are three different ways of arrangement (3!).

17. (4)

Insulin helps in conversion of glucose to glycogen. This process is called glycogenolysis.

18. (3)

Best source of vitamin A is carrot.

19. (2)

Deoxyribose is the sugar present in DNA and ribose is present in RNA.

20. (1)

Thyroxine is the hormone which helps in the regulation of metabolism of the body.

Biomolecules MCQ (21-30)

21. The number of amino acids commonly found in protein is
    1. 10
    2. 15
    3. 20
    4. 25
22. Which of the following is used in a chemical test to test the presence of sugar?
    1. Iodine solution
    2. Benedict’s solution
    3. Biuret reagent
    4. Bromothymol blue
23. Which of the following is used in a chemical test to test for the presence of protein?
    1. Iodine solution
    2. Benedict’s solution
    3. Biuret reagent
    4. Bromothymol blue
24. The disease Beri Beri is caused by deficiency of vitamin
    1. B1
    2. A
    3. C
    4. D
25. D galactose contains how many carbon atoms?
    1. 4
    2. 5
    3. 8
    4. 6
26. Starch is a polymer of
    1. glucose
    2. fructose
    3. galactose
    4. lactose
27. Which of the following is a linear polymer?
    1. amylopectin
    2. glycogen
    3. starch
    4. amylose
28. Which of the following hormones contains iodine?
    1. Insulin
    2. Thyroxine
    3. Adrenaline
    4. Testosterone
29. Sucrose is a
    1. reducing sugar
    2. non reducing sugar
    3. mixture of glucose
    4. monosaccharide and fructose
30. Rice is deficient in
    1. lysine
    2. alanine
    3. glycine
    4. isoleucine

Answers (21-30)

21. (3)

There are 20 amino acids present protein.

22. (2)

Benedict’s solutions is used for the chemical test for sugars.

23. (3)

Biuret test is used is used for the detection of peptide bonds.

24. (1)

Beri-Beri is caused by the deficiency of B1 (B1 vitamin is also called thiamine).

25. (4)

D-galactose contains 6 carbon atoms.

26. (1)

Starch is the polymer of glucose.

27. (4)

Amylose is a linear polymer.

28. (2)

Thyroxine contains contains iodine.

29. (2)

Sucrose is a non-reducing sugar.

30. (1)

Rice is deficient in the amino acid lysine.

Biomolecules MCQ (31-40)

31. Which of the following statements about RNA is not correct?
    1. It has a single strand
    2. It does not undergo replication
    3. It does not contain any pyrimidine base
    4. It controls the synthesis of proteins
32. Which of the following statements is true for protein synthesis (translation)?
    1. Amino acids are directly recognised by mRNA
    2. The third base of codon is less specific
    3. Only one codon codes for amino acid
    4. Every tRNA has more than one amino acid attachment
33. The enzymes which have control site in addition to active site are called
    1. holoenzymes
    2. coenzymes
    3. apoenzymes
    4. allosteric enzymes
34. Which element is absent in protein
    1. carbon
    2. nitrogen
    3. sulphur
    4. phosphorus
35. Which of the following does not react with glucose?
    1. NH₃
    2. NaHSO₃
    3. Schiff’s reagent
    4. All of these
36. Successive nucleotides are covalently linked through
    1. phosphodiester bond
    2. hydrogen bond
    3. sulfide bonds
    4. any type of bonds
37. Burette test is given by the following amino acids
    1. arginine
    2. tryptophan
    3. histidine
    4. proline
38. The common feature amongst nucleus, chloroplast and mitochondria is
    1. DNA
    2. cell wall
    3. lamellae
    4. cristae
39. Maximum amount of RNA is found in
    1. nucleolus
    2. ribosomes
    3. chloroplast
    4. cytoplasm
40. When adenine is attached to ribose sugar it is called adenosine. To make a nucleotide from it would require
    1. oxygenation
    2. addition of a base
    3. addition of phosphate
    4. hydrogenation

Answers (31-40)

31. (3)

Cytosine is a pyrimidine base which is present in RNA.

32. (2)

The third base of codon is less specific.

33. (4)

The enzymes which have control site in addition to active site are called allosteric enzymes.

34. (4)

Phosphorus is absent in proteins.

35. (3)

Glucose does not react with 2,4-DNP also called Schiff’s reagent.

36. (1)

Successive nucleotides are covalently linked through phosphodiester linkage.

37. (3)

Histdine is the only amino acid which gives biuret test.

38. (1)

The common feature amongst nucleus, chloroplast and mitochondria is DNA.

39. (2)

Maximum amount of RNA is found in ribosomes.

40. (3)

When adenine is attached to ribose sugar it is called adenosine. To make a nucleotide from it would require addition of phosphate.

Biomolecules MCQ (41-50)

41. Select the incorrect statement about amylose.

1 . It gives blue colour with iodine solution

2. It is unbranched

3. It is soluble in water

4. It has ɑ-C1-C6 linkages

42. Vitamin B6 is known as

1 . pyridoxine

2. thiamine

3. tocopherol

4. riboflavin

43. Which of the following disaccharide gives the ketose and an aldose only on hydrolysis?

1 . sucrose

2 . maltose

3. lactose

4. all of these

44. Sucrose on hydrolysis gives

1 . glucose and maltose

2. glucose and lactose

3. glucose and fructose

4. only glucose

45. Glycogen is a

1 . linear polymer with no branching

2. contains more branching than amylopectin

3. contains less branching than amylopectin

4. cannot be digested by human beings

46. Starch contains

1 . 20% of amylose and 80% of amylopectin

2. 30% of amylose and 80% of amylopectin

3. 80% of amylose and 20% of amylopectin

4. 70% of amylose and 30% of amylopectin

47. Antibodies are

1 . Carbohydrates

2. Proteins

3. Lipids

4. Enzymes

48. Which of the following is false for ꞵ-glucose?

1 . Melting point = 423 K

2. Specific rotation = +19.0°

3. Sweet taste

4. Dissolves in ether

49. The vitamins absorbed from intestine along with fats are

1 . A,D

2. A,B

3. A,C

4. D,B

50. Lysine is least soluble in water in the pH range

1 . 3-4

2. 5-6

3. 6-7

4. 8-9

Answers (41-50)

41. (4)

Amylose has ɑ-C1-C4 linkages.

42. (1)

Vitamin B6 is also known pyridoxine.

43. (1)

Sucrose

44. (3)

Sucrose on hydrolysis gives glucose and fructose.

45. (2)

Amylose is structurally similar to amylopectin but is extensively branched.

46. (1)

20% of amylose and 80% of amylopectin

47. (2)

Antibodies are proteins.

48. (4)

Glucose doesn’t dissolves in ether.

49. (1)

VItamin A and D are absorbed by the intestine.

50. (4)

Lysine is least soluble in water in the pH range 8-9.

Assertion And Reasoning MCQs

Codes

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true and but R is not a correct explanation of A

(c) A is true but R is false

(d) A is false, but R is true

1 . Assertion : When the native protein is subjected to physical changes such a change in temparature or chemical change such as pH, its H-bonds are disturbed. This disturbance unfolds the globules and uncoils the helix. As a result, the protein loses its biological activity. This loss of biological activity is called denaturation.

Reason : One of the examples of denaturation of proteins is the coagulation of egg white when an egg is boiled.

2. Assertion : D (+)-glucose is dextrorotatory in nature.

Reason : ‘D’ represents the dextrorotatory nature.

3. Assertion : The polypeptide chain in globular protein is folded around itself, giving rise to a spherical structure.

Reason : Some enzymes are globular proteins.

4. Assertion : DNA is responsible for the transmission of inherent characters from one generation to the next. This process of transmission is called heredity.

Reason : Nucleic acids are responsible for protein synthesis in a cell.

5. Assertion : Glycine must be taken through diet.

Reason : It is an essential amino acid.

6. Assertion : Fibrous protein is a fibre-liked structure formed by the polypeptide chain. These proteins are held together by strong hydrogen and disulphide bonds.

Reason : It is usually soluble in water.

7. Assertion : In presence of enzyme, substrate molecule can be attacked by the reagent effectively.

Reason : Active sites of enzyme hold the substrate molecule in a suitable position.

Assertion And Reasoning Answers

1 . (a)

In a biological system, a protein is found to have a unique 3D structure and a unique biological activity. In such a situation, the protein is called native protein. However, when the native protein is subjected to physical changes, the H-bonds are disturbed. This disturbance uncoils the helix.

As a result, protein loses its biological activity and this is called denaturation. During this process, the secondary and tertiary structures of the protein gets destroyed but the primary structure remains intact. One of the examples of denaturation of proteins in boiling of egg.

2. (c)

D corresponds to the position of -OH group on the right side on the fathest asymmetric carbon.

3. (c)

All enzymes are globular proteins.

4. (b)

Nucleic acids are responsible for protein synthesis in a cell. Even though the proteins are synthesized by the various RNA molecules in a cell, the message for synthesis of a particular protein is present in DNA.

5. (d)

Non-essential amino acids are those that can be produced in the body. Non-essential amino acids, such as glycine, are an example.

6. (c)

Proteins that are fibrous A fibre-like structure is generated when polypeptide chains run parallel and are kept together by hydrigen and disulphide bonds. In most cases, these proteins are water insoluble.

7. (a)

Because active sites of enzymes retain the substrate molecule in a favourable place, it can be attacked by a reagent effectively when there is an enzyme present. As a result, enzyme-catalysed reactions are stereospecific.

Frequently Asked Questions (FAQs)

Final Words

From the above article, you have practiced Biomolecules MCQ of Class 12 Chemistry Chapter 14. We hope that the above mentioned latest MCQs for Term 1 of Chapter 14 Biomolecules will surely help you in your exam.

If you have any doubts or queries regarding the Biomolecules Multiple Choice Questions with Answers of CBSE Class 12 Chemistry, feel free to reach us and we will get back to you as early as possible.