Biomolecules MCQs with answers

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Q. RNA and DNA are chiral molecules, their chirality is due to
  • (A) chiral bases
  • (B) chiral phosphate units
  • (C) L-sugar component
  • (D) D-sugar component
πŸ’¬ Discuss
βœ… Correct Answer: (D) D-sugar component
Q. Glucose does not react with
  • (A) NH2OH
  • (B) Cone. HNO3
  • (C) (CH3CO)2O
  • (D) NaHSO3
πŸ’¬ Discuss
βœ… Correct Answer: (D) NaHSO3
Q. The glycosidic linkage involved in linking the glucose units in amylose part of starch is
  • (A) C1 -C4 Ξ²-linkage
  • (B) C1 -C6 Ξ±-linkage
  • (C) C1 -C4 Ξ±-linkage
  • (D) C1 -C6 Ξ²-linkage
πŸ’¬ Discuss
βœ… Correct Answer: (C) C1 -C4 Ξ±-linkage
Q. A basic amino acid among the following is
  • (A) glycine
  • (B) valine
  • (C) histidine
  • (D) leucine
πŸ’¬ Discuss
βœ… Correct Answer: (C) histidine
Q. Glucose on oxidation with Br2(aq) gives
  • (A) Gluconic acid
  • (B) Tartaric acid
  • (C) Sachharic acid
  • (D) Meso-oxalic acid
πŸ’¬ Discuss
βœ… Correct Answer: (A) Gluconic acid
Q. Which of the following is non-reducing sugar?
  • (A) Glucose
  • (B) Sucrose
  • (C) Maltose
  • (D) Lactose
πŸ’¬ Discuss
βœ… Correct Answer: (B) Sucrose
Q. Which of the following statements is not correct?
  • (A) Ovalbumin is a simple food reserve in egg white.
  • (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.
πŸ’¬ Discuss
βœ… Correct Answer: (C) Denaturation makes the proteins more active.
Q. Deficiency of vitamin B, causes the disease
  • (A) convulsions
  • (B) beri beri
  • (C) cheilosis
  • (D) sterility
πŸ’¬ Discuss
βœ… Correct Answer: (B) beri beri
Q. Which one of the following metals is required as cofactor by all enzymes utilizing ATP in phosphate transfer?
  • (A) K
  • (B) Ca
  • (C) He
  • (D) Mg
πŸ’¬ Discuss
βœ… Correct Answer: (D) Mg
Q. In aqueous solution, an amino acid exist as
  • (A) cation
  • (B) anion
  • (C) zwitter ion
  • (D) neutral molecule
πŸ’¬ Discuss
βœ… Correct Answer: (C) zwitter ion
Q. Glycogen is a branched chain polymer of Ξ±-D-glucose units in which chain is formed by C1β€”C4 glycosidic linkage whereas branching occurs by the formation of C1– C6 glycosidic linkage. Structure of glycogen is similar to __________ .
  • (A) Amylose
  • (B) Amylopectin
  • (C) Cellulose
  • (D) Glucose
πŸ’¬ Discuss
βœ… Correct Answer: (B) Amylopectin
Q. Which of the following polymer is stored in the liver of animals?
  • (A) Amylose
  • (B) Cellulose
  • (C) Amylopectin
  • (D) Glycogen
πŸ’¬ Discuss
βœ… Correct Answer: (D) Glycogen
Q. Proteins are found to have two different types of secondary structures viz. Ξ±-helix and Ξ²-pIeated sheet structure, Ξ±-helix structure of protein is stabilised by :
  • (A) Peptide bonds
  • (B) van der Waals forces
  • (C) Hydrogen bonds
  • (D) Dipole-dipole interactions
πŸ’¬ Discuss
βœ… Correct Answer: (C) Hydrogen bonds
Q. Which of the following acids is a vitamin?
  • (A) Aspartic acid
  • (B) Ascorbic acid
  • (C) Adipic acid
  • (D) Saccharic acid
πŸ’¬ Discuss
βœ… Correct Answer: (B) Ascorbic acid
Q. Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between which carbon atoms of pentose sugars of nucleotides are these linkages present?
  • (A) 5’and 3β€²
  • (B) 1’and 5β€²
  • (C) 5β€² and 5β€²
  • (D) 3β€² and 3β€²
πŸ’¬ Discuss
βœ… Correct Answer: (A) 5’and 3β€²
Q. Nucleic acids are the polymers of __________ .
  • (A) Nucleosides
  • (B) Nucleotides
  • (C) Bases
  • (D) Sugars
πŸ’¬ Discuss
βœ… Correct Answer: (B) Nucleotides
Q. Each polypeptide in a protein has aminoacids linked with each other in a specific sequence. This sequence of amino acids is said to be __________
  • (A) primary structure of proteins
  • (B) secondary structure of proteins
  • (C) tertiary structure of proteins.
  • (D) quaternary structure of proteins.
πŸ’¬ Discuss
βœ… Correct Answer: (A) primary structure of proteins
Q. Which of the following B group vitamins can be stored in our body?
  • (A) Vitamin B1
  • (B) Vitamin B2
  • (C) Vitamin B6
  • (D) Vitamin B12
πŸ’¬ Discuss
βœ… Correct Answer: (D) Vitamin B12
Q. Which of the following reactions of glucose can be explained only by its cyclic structure?
  • (A) Glucose forms pentaacetate.
  • (B) Glucose reacts with hydroxylamine to form an oxime.
  • (C) Pentaacetate of glucose does not react with hydroxylamine.
  • (D) Glucose is oxidised by nitric acid to gluconic acid.
πŸ’¬ Discuss
βœ… Correct Answer: (C) Pentaacetate of glucose does not react with hydroxylamine.
Q. The sugar present in milk is
  • (A) Sucrose
  • (B) Maltose
  • (C) Glucose
  • (D) lactose
πŸ’¬ Discuss
βœ… Correct Answer: (D) lactose
Q. Ξ±-D (+) glucose and Ξ²-D (+) – glucose are
  • (A) Enantiomers
  • (B) Geometrical isomers
  • (C) Anomers
  • (D) Epimers
πŸ’¬ Discuss
βœ… Correct Answer: (C) Anomers
Q. Distinction between glucose and fructose can be done by
  • (A) Benedict’s solution
  • (B) Tollen’s reagent
  • (C) Fehling solution
  • (D) Selivanoff’s reagent
πŸ’¬ Discuss
βœ… Correct Answer: (D) Selivanoff’s reagent
Q. Which does not show mutarotation?
  • (A) Glucose
  • (B) Maltose
  • (C) Fructose
  • (D) Sucrose
πŸ’¬ Discuss
βœ… Correct Answer: (D) Sucrose
Q. The reagent used for obtaining osazone derivative of fructose is
  • (A) NH2OH
  • (B) NH2 – NH2
  • (C) NH2 – NHC6H5
  • (D) 2, 4-DNP
πŸ’¬ Discuss
βœ… Correct Answer: (C) NH2 – NHC6H5
Q. Amylopectin is a polymer of
  • (A) Ξ²-D-glucose
  • (B) Ξ±-D-glucose
  • (C) Ξ²-D-frutose
  • (D) Ξ±-D-fructose
πŸ’¬ Discuss
βœ… Correct Answer: (B) Ξ±-D-glucose
Q. Hydrolysis of sucrose gives
  • (A) Glucose only
  • (B) Glucose + fructo
  • (C) Glucose and galactose
  • (D) Maltose
πŸ’¬ Discuss
βœ… Correct Answer: (B) Glucose + fructo
Q. The disease resulting from the intake of amino acid deficient diet is
  • (A) Kwasiorkar
  • (B) Pernicicres anaemia
  • (C) PEM
  • (D) Haemophilio
πŸ’¬ Discuss
βœ… Correct Answer: (A) Kwasiorkar
Q. Kerating present in hair is an example of
  • (A) Fibrous protein
  • (B) Globular protein
  • (C) Conjugated protein
  • (D) Derived protein
πŸ’¬ Discuss
βœ… Correct Answer: (A) Fibrous protein
Q. DNA and RNA differ in
  • (A) Sugar
  • (B) Purines
  • (C) Pyrimidines
  • (D) Both A and C
πŸ’¬ Discuss
βœ… Correct Answer: (D) Both A and C
Q. The vitamin present in oils and fats are
  • (A) A and D
  • (B) B and C
  • (C) A and B
  • (D) A and C
πŸ’¬ Discuss
βœ… Correct Answer: (A) A and D

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Table of contents

  1. RNA and DNA are chiral molecules, their chirality is due to
  2. Glucose does not react with
  3. The glycosidic linkage involved in linking the glucose units in amylose part of starch is
  4. A basic amino acid among the following is
  5. Glucose on oxidation with Br2(aq) gives
  6. Which of the following is non-reducing sugar?
  7. Which of the following statements is not correct?
  8. Deficiency of vitamin B, causes the disease
  9. Which one of the following metals is required as cofactor by all enzymes utilizing ATP in phosphate
  10. In aqueous solution, an amino acid exist as
  11. Glycogen is a branched chain polymer of Ξ±-D-glucose units in which chain is formed by C1
  12. Which of the following polymer is stored in the liver of animals?
  13. Proteins are found to have two different types of secondary structures viz. Ξ±-helix and Ξ²-pIeated
  14. Which of the following acids is a vitamin?
  15. Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between whic
  16. Nucleic acids are the polymers of __________ .
  17. Each polypeptide in a protein has aminoacids linked with each other in a specific sequence. This seq
  18. Which of the following B group vitamins can be stored in our body?
  19. Which of the following reactions of glucose can be explained only by its cyclic structure?
  20. The sugar present in milk is
  21. Ξ±-D (+) glucose and Ξ²-D (+) – glucose are
  22. Distinction between glucose and fructose can be done by
  23. Which does not show mutarotation?
  24. The reagent used for obtaining osazone derivative of fructose is
  25. Amylopectin is a polymer of
  26. Hydrolysis of sucrose gives
  27. The disease resulting from the intake of amino acid deficient diet is
  28. Kerating present in hair is an example of
  29. DNA and RNA differ in
  30. The vitamin present in oils and fats are

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