14. BIOMOLECULES Objective

14. BIOMOLECULES


1. 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)


2. 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)


3. Which of the following compounds is found abundatly in nature ?

(A) Fructose
(B) Starch
(C) Glucose
(D) Cellulose

Answer ⇒ (D)


4. 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)


5. Maltose is made up of

(A) two α-D-glucose
(B) normal β-D-glucose
(C) α- and β-D-glucose
(D) fructose

Answer ⇒ (A)


6. What is the basic formulae for starch ?

(A) (C6H12O6)n
(B) (C6H10O5)n
(C) C12O22O11
(D) (C6H12O4)n

Answer ⇒ (B)


7. Which of the following is an example of an ldopentose ?

(A) D-Ribose
(B) Glyceraldehyde
(C) Fructose
(D) Erythrose

Answer ⇒ (A)


8. Which of the following treatment will convert starch directly into glucose ?

(A) Heating with dilute H2SO4
(B) Fermentation by diastase
(C) Fermentation by zymase
(D) Heating with dilute NaOH

Answer ⇒ (A)


9. The general formula of carbohydrates is

(A) CnH2n + 1O
(B) CnH2nO
(C) CX(H2O)y
(D) Cn(H2O)2n

Answer ⇒ (C)


10. What are the hydrolysis products of sucrose ?

(A) Fructose + Fructose
(B) Glucose + Glucose
(C) Glucose + Galactose
(D) D-Glucose + D-Fructose

Answer ⇒ (D)


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

(A) zymase
(B) lactase
(C) maltase
(D) diastase

Answer ⇒ (C)


12. Vhich of the following is a non-reducing sugar ?

(A) Glucose
(B) Sucrose
(C) Maltose
(D) Lactose

Answer ⇒ (B)


13. Which one of the following is not correct ?

(A) D (-) Fructose exist sin faranose structure
(B) D (+) Glucose exists in pyranose structure
(C) In sucrose the two monosaccharides are held together by peptide linkage
(D) Maltose is a reducing sugar

Answer ⇒ (C)


14. Glucose Glucose Product is

(A) hexanoic acid
(B) gluconi acid
(C) saccharic acid
(D) bromohexane

Answer ⇒ (B)


15. Cellulose ify Saccharide

(A) hexapoly saccharide
(B) pentapolysaccharide
(C) tripolysaccharide
(D) None of these

Answer ⇒ (D)


16. Amino acids generally exist in the form of Zwitter ions. This means they contain

(A) Basic – NH2 group and acidic – COOH group
(B) The basic – NH3 group and acidic-COO-group
(C) Basic – NH2 and acidic – H+ group
(D) Basic – COO- group and acidic – NH3 group

Answer ⇒ (D)


17. Which one of the amino acids can be synthe- sised in the body ?

(A) Alanine
(B) Lysine
(c) Valine
(D) Histidine

Answer ⇒ (A)


18. 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 structures

Answer ⇒ (D)


19. Which of the following is an acidic amino acid ?

(A) Glycine
(B) Valine
(C) Leucine
(D) Glutamic acid

Answer ⇒ (D)


20. The melting points of amino acids are higher than the corresponding hal-acids because

(A) amino acids exist as zwitter ions resulting in strong dipole-dipole attraction
(B) amino acids are optically active
(C) due to higher molecular mass of – NH2 group molecular mass of amino acids is higher
(D) they interact with water more than halo-acids and have salt like structure

Answer ⇒ (A)


21. On boiling the egg, what structural changes are taking place in the egg white ?

(A) The colour of the egg changes from colourless to white
(B) 2° and 3° structures are destroyed but 1° structure remains intact
(C) 1°, 2° and 3° structures of egg are destroyed
(D) A reversible change takes place which can be reversed by decreasing the temperature

Answer ⇒ (B)


22. Which one of the following sets of monosaccharides forms sucrose ?

(A) α-D-galactopyranose and α-D-glucopyranose
(B) α-D-glucopyranose and β-D-fructofuranose
(C) β-D-glucopyranose and α-D-fructofuranose
(D) α-D-glucopyranose and β-D-fructopyranose

Answer ⇒ (B)


23. The number of amino acids found in proteins tkaza human body qBP synthesise is

(A) 20
(B) 25
(C) 10
(D) 100

Answer ⇒ (A)


24. Vitamin A is present in

(A) fish liver oil
(B) milk
(C) butter
(D) all of these

Answer ⇒ (D)


25. Which of the following vitamins is water

(A) Vitamin E
(B) Vitamin D
(C) Riboflavin
(D) Retinol

Answer ⇒ (C)


26. Vitamin B2, a water soluble vitamin is also known as

(A) ascorbic acid
(B) riboflavin
(C) thiamine
(D) pyridoxine

Answer ⇒ (B)


27. Which is a fat soluble vitamin ?

(A) Vitamin A
(B) Vitamin B6
(C) Vitamin C
(D) Vitamin B2

Answer ⇒ (A)


28. 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)


29. In DNA, the complimentary bases are

(A) uracil and adenine, cytosine and guanine
(B) adenine and thymine, guanine and cytosine
(C) adenine and thymine, guanine and uracil
(D) adenine and guanine, thymine and cytosine

Answer ⇒ (B)


30. RNA is a

(A) single helix strand
(B) double helix strand
(C) right hand twisted double helix strand
(D) triple helix strand

Answer ⇒ (A)


31. The double strand helix structure of DNA was proposed by

(A) Har Gobind Khurana
(B) Watson and Crick
(C) A. R. Todd
(D) G. W. Kenner

Answer ⇒ (B)


32. Which of the following acids is a vitamin ?

(A) Aspartic acid
(B) Ascrobic acid
(C) Adipic acid
(D) Saccharic acid

Answer ⇒ (B)


33. 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 3′
(B) l’ and 5′
(C) 5′ and 5′
(D) 3′ and 3′

Answer ⇒ (A)


34. 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)


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

(A) Adenine
(B) Thymine
(C) Cytosine
(D) Uracil

Answer ⇒ (D)


36. Three cyclic structures of monosaccharides are given below. Which of these are anomers ?

Three cyclic structures of monosaccharides

(A) I and II
(B) II and III
(C) I and III
(D) III is anomer of I and II

Answer ⇒ (A)


Class 12th Chemistry Objective Question English

S.N CHEMISTRY OBJECTIVE English Medium
1 SOLID STATE 
2 SOLUTION
3 ELECTROCHEMISTRY
4 CHEMICAL KINETICS
5 SURFACE CHEMISTRY
6 GENERAL PRINCIPLES & PROCESSES OF ISOLATION OF ELEMENTS
7 THE P-BLOCK ELEMENTS
8 THE D- AND f-BLOCK ELEMENTS
9 CO-ORDINATION COMPOUNDS
10 HALOALKANES AND HALOARENES
11 ALCOHOLS, PHENOLS AND ETHERS
12 ALDEHYDES, KETONES AND CARBOXYLIC ACIDS
13 AMINES
14 BIOMOLECULES
15 POLYMERS
16 CHEMISTRY IN EVERYDAY LIFE
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