12th Chemistry In English

BSEB 12th Chemistry Exam VVI Objective MCQ Question Biomolecules Chapter


14. BIOMOLECULES


1. The carbohydrate which cannot be hydrolysed further is : 

(A) Di-saccharide 

(B) Mono-saccharide

(C) Oligo-saccharide

(D) None of these

Answer :- (B)

2. Glucose is a : 

(A) Mono-saccharide

(B) Di-saccharide 

(C) Oligo-saccharide

(D) None of these

Answer :- (A)

3. 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

Answer :- (B)

4. On oxidation with a mild oxidising agent like Br2/H2O, the glucose is oxidized to : 

(A) saccharic acid 

(B) glucaric acid

(C) gluconic acid 

(D) valeric acid

Answer :- (C)

5. Invert sugar is 

(A) a type of cane sugar 

(B) optically inactive form of sugar

(C) mixture of glucose and galactose 

(D) mixture of glucose and fructose in equimolar quantities 

Answer :- (D)

6. Which of the following compounds is found abundantly in nature ?

(A) Fructose 

(B) Starch

(C) Glucose 

(D) Cellulose

Answer :- (D)

7. Starch is composed of two polysaccharides which are : 

(A) amylopectin and glycogen

(B) amylose and glycogen

(C) amylose (20%) and amylopectin (80%)

(D) cellulose and glycogen 

Answer :- (C)

8. Which reagent is used to convert glucoseinto saccharic acid ?

(A) Br2/H2O

(B) Nitric acid 

(C) Alkaline solution of iodine

(D) Ammonium hydroxide 

Answer :- (B)

9. What is the basic formula for starch? 

(A) (C6H12O)n

(B) (C6H12O5)n

(C) C12H22O11 

(D) (C6H12O4)n

Answer :- (B)

10. The general formula of carbohydrates is

(A) CnH2n+1O

(B) CnH2nO

(C) Cx(H2O)y

( D) Cn(H2O)2n

Answer :- (C)

11. What are the hydrolysis products of sucrose ? 

(A) Fructose + Fructose

(B) Glucose + Glucose

(C) Glucose + Galactose

(D) D-Glucose + D-Fructose 

Answer :- (D)

12. Carbohydrates are stored in human body as the polysaccharide :

(A) starch 

(B) glycogen

(C) cellulose 

(D) amylose

Answer :- (B)

13. In nucleic acids, the sequence is : 

(A) base – phosphate – sugar

(B) base – sugar – phosphate

(C) sugar – base – phosphate

(D) phosphate – base – sugar 

Answer :- (B)

14. The conversion of maltose into glucose is possible by the enzyme :

(A) zymase 

(B) lactase

(C) maltase 

(D) diastase

Answer :- (C)

15. Which of the following is a non-reducing sugar? 

(A) Glucose 

(B) Sucrose

(C) Maltose 

(D) Lactose

Answer :- (B)

 16. Globular proteins are present in 

(A) blood 

(B) eggs

(C) milk 

(D) all of these

Answer :- (D)

17. Which one of the amino acids can be synthesised in the body?

(A) Alanine 

(B) Lysine

(C) Valine 

(D) Histidine

Answer :- (A)

18. Formula of sucrose is : 

(A) C12H22O12

(B) C12H22O11

(C) C12H24O11 

(D) C12H22O10

Answer :- (B)

19. Carbohydrate which yield three to ten mono saccharide units on hydrolysis is called : 

(A) Monosaccharide 

(B) Disaccharide

(C) Oligosaccharide

(D) Polysaccharide

Answer :- (C)

20. Proteins are condensation polymers of : 

(A) α-amino acids 

(B) β-amino acids

(C) α-hydroxy acids

(D) β-hydroxy acids 

Answer :- (A)

21. Keratin, a structural protein is present in : 

(A) hair

(B) wool

(C) silk 

(D) all of these

Answer :- (D)

22. Which of the following is basic amino acid ? 

(A) Lysine 

(B) Proline

(C) Alanine 

(D) Aspartic acid

Answer :- (A)

23. The α-amino acid which contains the aromatic side chain is : 

(A) proline 

(B) tyrosine

(C) valine 

(D) serine

Answer :- (B)

24. The number of amino acids found in proteins that a human body can synthesise is :

(A) 20 

(B) 25

(C) 10 

(D) 100 

Answer :- (A)

25. Which of the following diseases is caused by deficiency of an enzyme ?

(A) Phenylketone urea 

(B) Cheilosis

(C) Scurvy

(D) Xerophthalmia

Answer :- (A)

26. Enzymes are made up of : 

(A) edible proteins 

(B) Proteins with specific structure

(C) nitrogen containing carbohydrates

(D) carbohydrates

Answer :- (B)

27. Vitamin A is present in :

(A) fish liver oil 

(B) milk

(C) butter  

(D) all of these

Answer :- (D)

28. Which of the following vitamins is water soluble ? 

(A) Vitamin E 

(B) Vitamin D

(C) Riboflavin 

(D) Retinol

Answer :- (C)

29. Which is a fat soluble vitamin? 

(A) Vitamin A

(B) Vitamin B6

(C) vitamin C

(D) Vitamin B2

Answer :- (A)

30. Vegetable oils like wheat germ oil, sunflower oil, etc are the good source of:

(A) Vitamin K 

(B) Vitamin E

(C) Vitamin D 

(D) Vitamin A

Answer :- (B)

31. Deficiency of vitamin E causes : 

(A) rickets 

(B) scurvy

(C) muscular weakness

(D) beri beri

Answer :- (C)

32. DNA and RNA contain four bases each. Which of the following bases is not present in RNA ?

(A) Adenine 

(B) Uracil

(C) Thymine 

(D) Cytosine

Answer :- (C)

33. 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

Answer :- (D)

34. Which of the following bases is not present in DNA ? 

(A) Adenine

(B) Thymine

(C) Cytosine 

(D) Uracil

Answer :- (D)

35. Which of the following is mono-saccharide ? 

(A) Sucrose 

(B) Maltose

(C) Lactose 

(D) Fructose

Answer :- (D)

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