CBSE Questions for Class 12 Engineering Chemistry Biomolecules Quiz 9 - MCQExams.com

Glycogen, a naturally occurring polymer stored in animals is a:
  • monosaccharide
  • disaccharide
  • trisaccharide
  • polysaccharide
Which of the following compounds is found in abundance in nature?
  • Fructose
  • Glucose
  • Starch
  • Cellulose
Which of the following vitamin is insoluble in water and fat both?
  • E
  • K
  • H
  • C
Which carbohydrate does not have $$C_x(H_2O)_y$$ general formula?
  • Melitriose
  • Stachyose
  • Fructose
  • Rhamnose
Non-reducing sugar is:
  • maltose.
  • sucrose.
  • lactose.
  • None of these.
Which set of terms correctly identifies the carbohydrate shown?
(1) Pentose  (2) Pentulose  (3) Hexulose  (4) Hexose  (5)  Aldose  (6) Ketose  (7) Pyranose  (8) Furanose  
995898_08a9ada5c8014674bbd48fb37ac37f82.jpg
  • 2,6,8
  • 2,6,7
  • 1,5,8
  • A set of terms other than these
$$NH_2 - \underset{CH_3}{\underset{|}{C}H} - \overset{O}{\overset{||}{C}} - NH - CH_2 - CO_2H$$
Identify the amino acid obtained by hydrolysis of the above compound.
  • Glycine
  • Alanine
  • Both a and b
  • None of these
Which of the following pair is $$C_2$$ epimer?
  • D-Glucose , D- Maltose
  • D- Glucose , D- Mannose
  • D- Allose , D- Ribose
  • D-Glucose , D- Arabinose
D-glucose & D-fructose can be differentiated by :
  • Fehling solution
  • Tollens reagent
  • Benedict test
  • $$Br_2/H_2O$$
One cyclic acetal form of D-galactose is shown.
Which atom is the anomeric carbon?
996226_92e02f20fb0946eaa182f5183d65c46a.jpg
  • Atom A
  • Atom B
  • Atom C
  • Atom D
  • Atom E
  • Atom F
Which of the following isomeric sugars is most stable?
Synthesis of each molecule of glucose in photosynthesis involves:
  • $$6$$ molecules of ATP
  • $$18$$ molecules of ATP
  • $$10$$ molecules of ATP
  • $$8$$ molecules of ATP
Which glycosidic linkage is present in Maltose?
  • $$\alpha -D-\left( + \right) -glucose\left( { C }_{ 1 } \right) -O-\left( { C }_{ 4 } \right) -\alpha-D-\left( + \right) -glucose$$
  • $$\alpha -D-\left( + \right) -glucose\left( { C }_{ 1 } \right) -O-\left( { C }_{ 2 } \right) -\beta -D-\left( - \right) -glucose$$
  • $$\beta -D-\left( + \right) -glucose\left( { C }_{ 1 } \right) -O-\left( { C }_{ 4 } \right)-\beta -D-\left( + \right) -glucose$$
  • $$\beta -D-\left( + \right) -glucose\left( { C }_{ 1 } \right) -O-\left( { C }_{ 4 } \right) -\alpha-D-\left( - \right) -glucose$$
The two functional groups present in a typical carbohydrate are :
  • $$-CHO$$ and $$-COOH$$
  • $$-CO$$ and $$-OH$$
  • $$-OH$$ and $$-CHO$$
  • $$-OH$$ and $$-COOH$$
Which among the following is not the example of carbohydrate ?
  • Glucose 
  • fractose
  • Maltose
  • Nylon
One mole of each of glucose and fructose require $$x$$ and $$y$$ moles of periodic acid respectively, for oxidation. Hence, $$x/y$$ is
  • $$1/1$$
  • $$2/1$$
  • $$5/4$$
  • $$9/4$$
Glucose phosphates formed in photosynthesis are Asymmetrically labeled it is called:
  • Warbug's effect
  • Pasteur's effect
  • Dicken's effect
  • Gibb's effect
When an apoenzyme is separated from its metal component, its activity is
  • Decreased
  • Increased
  • Lost
  • Not affected
The tightly bound non proteinaceous organic compound is?
  • Prosthetic group
  • Cofactor
  • Apoenzyme
  • Holoenzyme
A carbohydrate $$X$$ having molecular weight $$180g{mol}^{-1}$$ has one primary alcohol group and four secondary alcoholic groups. It reacts with acetic anhydride to form pentaacetate. The molecular weight of pentaacetate formed is:
  • $$180$$
  • $$210$$
  • $$390$$
  • $$42$$
Which of the following carbohydrate(s) can be hydrolyzed?
  • Fructose
  • Sucrose
  • Glucose
  • Starch
  • Maltose
The reagent which may be used to distinguish between cane sugar and glucose solution is
  • Molusch's reagent
  • Iodine solution
  • Baeyer's reagent
  • Fehling's solution
The $$\alpha$$- D glucose and $$\beta$$- D glucose differ from each other due to difference in carbon atom with respect to its
  • Number of $$OH$$ groups
  • Size of hemiacetal ring
  • Conformation
  • Configuration
Molisch test is answered by
  • All carbohydrates
  • Sucrose
  • Fructose
  • Glucose
What is the nature of glucose-glucose linkage in starch that males its so susceptible to acid hydrolysis?
  • Starch is hemiacetal
  • Starch is acetal
  • Starch is polymer
  • Starch contain only few molecules of glucose
Number of $$HIO_4$$ molecule required to complete oxidation one mole of glucose is :
  • 4
  • 5
  • 6
  • None of these
Which of the following is the monomer of cellulose?
  • $$\beta-D$$-glucose
  • Amylose
  • Amylopectin
  • Glycogen
A dextro-rotatory sugar present in fruits is
  • Glucose
  • Fructose
  • Cellulose
  • Starch
A polypeptide on complete hydrolysis gives three amino acids. How many sequences are possible for that polypeptide?
  • 1
  • 3
  • 6
  • 9
Which of the following is not catalysed by a brush border enzyme?
  • Maltose $$ \underrightarrow {Maltase }$$ glucose+ glucose
  • Lactose $$ \underrightarrow { Lactase }$$ glucose+galactose
  • Starch $$ \underrightarrow { Amylase}$$ Disaccharide
  • Nucleotides $$ \underrightarrow { Nucleotidase }$$ Nucleoside
Which of the following statements correctly completes the statement?
Except for glycine, which is achiral, all the amino acids present in proteins
  • are chiral but racemic
  • have the $$L$$ configuration at their $$\alpha $$ carbon
  • have the $$R$$ configuration at their $$\alpha $$ carbon
  • have the $$S$$ configuration at their $$\alpha $$ carbon
$${ C }_{ 12 }{ H }_{ 22 }{ O }_{ 11 }\longrightarrow 12C+{ 11H }_{ 2 }{ O }$$ in presence of concentrated $${ H }_{ 2 }{ SO }_{ 4 }$$.

Which of the following is obtained in the above reaction?
  • Animal charcoal
  • Sugar charcoal
  • Coke
  • Wood charcoal
The volume of 10 N and 4 N HCl required to make 1 L of 7 N HCl are:
  • 0.5 L of 10 N HCl and 0.4 L of 4 N HCl
  • 0.6 L of 10 N HCl and 0.6 L of 4 N HCl
  • 0.8 L of 10 N HCl and 0.7 L of 4 N HCl
  • 0.75 L of 10 N HCl and 0.4 L of 4 N HCl
The active site of an enzyme is formed by a few of the enzyme's
  • Carboxyl groups of the amino acids in $$ {1 }^{ 0 } $$ and $$ {2 }^{ 0 } $$ structure
  • Amino groups of the amino acids in $$ {1 }^{ 0 }$$ and $$ {2 }^{ 0 } $$ structure
  • R groups of the amino acids in $$ {3 }^{ 0 } $$ structure
  • Exposed sulphur bonds in $$ {1 }^{ 0 } $$ and $$ {3 }^{ 0 } $$ structure
The two forms of $$D-$$glycopyranose obtained from solution of $$D-$$glucose are known as 
  • Epimers
  • Anomers
  • Enantiomers
  • Geometrical isomers
Rate of reaction depends upon_________?
  • Temperature
  • Catalyst
  • Concentration
  • All of these
Which of the following does not reduce Benedict's solution?
  • Sucrose
  • Aldehyde
  • Glucose
  • Fructose
The segment of DNA which acts as the instrumental manual for the synthesis of the protein is:
  • ribose
  • gene
  • nucleoside
  • nucleotide
Optimum temperature and pH for enzyme.
  • $$20$$-$$25^o$$-C and $$7$$pH
  • $$20$$-$$35^o$$-C and $$6.5$$ pH
  • $$20$$-$$35^o$$-C and $$7.5$$pH
  • All correct
In plant glycolipids, the sugar is normally.
  • oil
  • wax
  • glycolipid
  • phospholipid
The ultimate product of hydrolysis of starch is :
  • glucose
  • fructose
  • sucrose
  • None of these
Polynucleotides are ester of sugar with-
  • Phosphorus acid
  • Sulphuric acid
  • Phosphoric acid
  • Boric acis
Starch is:
  • $$C_{12}H_{22}O_{11}$$
  • $$C_6H_{10}O_5$$
  • $$(C_6H_{10}O_5)_n$$
  • $$(C_6H_{12}O_6)_n$$
Which among the following is the main constituent of Biogas?
  • Methane
  • Propane
  • Butane
  • Ethane
Some proteoltic enzymes are-
  • Trypsin, Erepsin, pepsin
  • Amylase, lipase, zymase
  • Ampylopsin, stapsin, ptyalin
  • Urease, Dehydrogenase, Zymase
Item 'I'
(compound)
Item 'II'
(reagent)


(A) Lysine(P)I-naphthol
(B)Furfural(Q)ninhydrin
(C) Benzyl alcohol(R) $$KMnO_4$$
(D)Styrene(S)ceric ammonium
  • (A) $$\to (Q)$$,(B) $$\to (P)$$, (C) $$\to (S)$$, (D) $$\to (R)$$
  • (A) $$\to (Q)$$,(B) $$\to (R)$$, (C) $$\to (S)$$, (D) $$\to (P)$$
  • (A) $$\to (Q)$$,(B) $$\to (P)$$, (C) $$\to (R)$$, (D) $$\to (S)$$
  • (A) $$\to (R)$$,(B) $$\to (P)$$, (C) $$\to (Q)$$, (D) $$\to (S)$$
A compound with molecular mass 180 is acylated with $$CH_3COCl$$ to get a compound with molecular mass $$390$$. The number of amino groups present per molecule of former compound is:
  • $$6$$
  • $$2$$
  • $$5$$
  • $$4$$
Thiol group is present on:-
  • Methionine
  • Cytosine
  • Cystine
  • Cysteine
Enzyme which catalyse the joining of C - O, C - S, C - N, P - O bonds : 
  • Lyases
  • transferases
  • Hydrolases
  • ligases
Cobalt as a rare element is essential in the synthesis of this vitamin _______.
  • $$C$$
  • $$D$$
  • $$B_1$$
  • $$B_{12}$$
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Engineering Chemistry Quiz Questions and Answers