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 тЗТ (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 тЗТ (D)


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

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

Answer тЗТ (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 тЗТ (C)


5. Maltose is made up of

(A) two ╬▒-D-glucose
(B) normal ╬▓-D-glucose
(C) ╬▒- and ╬▓-D-glucose
(D) fructose

Answer тЗТ (A)


6. What is the basic formulae for starch ?

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

Answer тЗТ (B)


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

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

Answer тЗТ (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 тЗТ (A)


9. The general formula of carbohydrates is

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

Answer тЗТ (C)


10. What are the hydrolysis products of sucrose ?

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

Answer тЗТ (D)


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

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

Answer тЗТ (C)


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

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

Answer тЗТ (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 тЗТ (C)


14. Glucose Glucose Product is

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

Answer тЗТ (B)


15. Cellulose ify Saccharide

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

Answer тЗТ (D)


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

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

Answer тЗТ (D)


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

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

Answer тЗТ (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 тЗТ (D)


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

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

Answer тЗТ (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 тАУ NH2 group molecular mass of amino acids is higher
(D) they interact with water more than halo-acids and have salt like structure

Answer тЗТ (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 тЗТ (B)


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

(A) ╬▒-D-galactopyranose and ╬▒-D-glucopyranose
(B) ╬▒-D-glucopyranose and ╬▓-D-fructofuranose
(C) ╬▓-D-glucopyranose and ╬▒-D-fructofuranose
(D) ╬▒-D-glucopyranose and ╬▓-D-fructopyranose

Answer тЗТ (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 тЗТ (A)


24. Vitamin A is present in

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

Answer тЗТ (D)


25. Which of the following vitamins is water

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

Answer тЗТ (C)


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

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

Answer тЗТ (B)


27. Which is a fat soluble vitamin ?

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

Answer тЗТ (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 тЗТ (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 тЗТ (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 тЗТ (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 тЗТ (B)


32. Which of the following acids is a vitamin ?

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

Answer тЗТ (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 тЗТ (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 тЗТ (D)


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

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

Answer тЗТ (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 тЗТ (A)


Class 12th Chemistry Objective Question English

S.N CHEMISTRY OBJECTIVE English Medium
1 SOLID STATE┬а
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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