UNIT 14 - BIOMOLECULES
1. During acetylation of glucose it needs ‘x’ moles of acetic anhydride. The value of ‘x’ would be
A. 3 B. 5 C. 4 D. 1
2. On oxidation with a mild oxidising agent like Br2/H2O, the glucose is oxidised to
A. saccharic acid B. glucaric acid C. gluconic acid D. valeric acid
3. Glycosidic linkage is an
A. amide linkage B. ester linkage C. ether linkage D. acetyl linkage
4. Which of the following statements is not true?
A. Glucose and fructose both are monosaccharides
B. The natural glucose and fructose are D-forms
C. The solution having equal molecules of D-glucose and D-fructose is termed as invert sugar
D. Aldohexoses exist in 26 optical forms
5. The 𝜶 and 𝜷 forms of glucose are
A. isomers of D (+) glucose and L(-) glucose respectively B. diastereomers of glucose
C. anomers of glucose D. isomers which differ in the configuration at C-2
6. Which of the following is not true about amino acids?
A. They are constituents of all proteins
B. Alanine having one amino and one carboxylic group
C. Most naturally occurring amino acids have D-configuration
D. Glycine is the only naturally occurring amino acid which is optically inactive
7. Denaturation of protein 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 structure D. loss of both secondary and tertiary structure
8. Which of the following amino acids are acidic
(i) (CH3)2CH CH COOH (ii) HOOC CH2 CH2 CH COOH
NH2 NH2
(iii) H2N CH2 CH COOH (iv) HOOC CH2 CH COOH
NH2 NH2
A. (ii) and (iv) B. (iii) and (iv) C. (i) and (ii) D. (ii) and (iii)
9. Helical structure of protein is stabilised by
A. peptide bond B. hydrogen bond C. Van der Waals’ force D. dipole association
10. Keratin a structural protein is present in
A. hair B. wool C. silk D. all of these
11. Which of the following vitamins is water soluble?
A. Vitamin E B. Vitamin D C. Riboflavin D. Retinol
12. Match the vitamins given in column I with the deficiency diseases caused by it given in column II and
mark the appropriate choice
Column I Column II
A Vitamin B1 (i) Convulsions
B Vitamin B2 (ii) Pernicious anaemia
C Vitamin B12 (iii) Beri beri
D Vitamin B6 (iv) Cheilosis
A. A-(iv) B-(iii) C-(i) D-(ii) B. A-(i) B-(iv) C-(iii) D-(ii)
C. A-(ii) B-(i) C-(iv) D-(iii) D. A-(iii) B-(iv) C-(ii) D-(i)
13. A unit in nucleic acid contains ‘base-sugar-phosphate’ is called
A. nucleotide B. nucleoside C. phosphotide D. polypeptide
14. Thymine is
A. 5-Methyl uracil B. 4-Methyl uracil C. 3-Methyl uracil D. 1-Methyluracil
15. Which of the following is not produced by human body?
A. Enzymes B. Vitamins C. Proteins D. Nucleic acids
16. Antihaemorrhagic factor is
A. Vitamin K B. Vitamin D2 C. Vitamin A2 D. Vitamin B12
17. The hormone that helps in the conversion of glucose to glycogen is
A. Cortisones B. Bile acids C. Adrenalin D. Insulin
18. Sanger’s reagent is used for the identification of
A. C-terminal amino acid of peptide chain B. N-terminal amino acid of peptide chain
C. Molecular mass of protein D. Secondary structure of protein
19. A peptide hormone is
A. Estrone B. Testosterone C. Progesterone D. Insulin
20. When sucrose is heated with conc. HNO3, the product formed is
A. Sucrose nitrate B. Adipic acid C. Oxalic acid D. Citric acid
21. Glycogen is a branched chain polymer of 𝜶-D-Glucose units in which chain is formed by C1-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
22. 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
23. 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
24. Which amino acid has no asymmetric carbon?
A. Histidine B. Threonine C. Alanine D. Glycine
25. Anti-sterility or anti-reproductory vitamin is
A. Vitamin B B. Vitamin C C. Vitamin D D. Vitamin E
26. Which of the following is a heterocyclic amino acid?
A. Tryptophan B. Phenylalanine C. Glycine D. Alanine
27. Cell membranes are mainly composed of
A. phospholipids B. fats C. proteins D. carbohydrates
28. (+)-Glucose and (-)-Fructose can be differentiated by
A. Tollens’ reagent B. Benedict solution C. Bromine water D. None of these
29. The enzyme which hydrolyses triglycerides to fatty acids
A. Maltase B. Lipase C. Zymase D. Pepsin
30. Match items in List I with those in List II from the combinations shown
List I List II
i Pepsin a Genetic material
ii Nucleic acid b Digestive enzyme
iii Ascorbic acid c Antibiotic
iv Testosterone d Sex hormone
e Vitamin
A. i. b ii. a iii. c iv. e B. i. b ii. a iii. e iv. d
B. i. a ii. b iii. e iv. c D. i. c ii. b iii. a iv. d
