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) $$\to (S)$$

MCQ Questions for Class 12 Engineering Chemistry Biomolecules Quiz 9

Glycogen, a naturally occurring polymer stored in animals is a:

0%
monosaccharide
0%
disaccharide
0%
trisaccharide
0%
polysaccharide

Explanation

Glycogen is a polysaccharide made up of almost

2000 - 200000

$2000-200000$ units of

α - D

$\alpha-D$ glucose, it is a branched structure, there are two types of bonds present in glycogen as the

α

$\alpha$ 1-4 glycosidic and

α

$\alpha$ 1-6 glycosidic bond.

Glycogen stores in cells of liver and muscles and gives the red color with iodine also it is named as animal starch.

Which of the following compounds is found in abundance in nature?

0%
Fructose
0%
Glucose
0%
Starch
0%
Cellulose

Explanation

Cellulose is a type of carbohydrate, containing chains of glucose rings. The cell walls, which are responsible for providing support and rigidity to the plants are made of cellulose.

It is also the primary constituent of wood, making it the most abundant organic compound found in nature.

Hence, the correct answer is option

D

$\text{D}$ .

Which of the following vitamin is insoluble in water and fat both?

0%
E
0%
K
0%
H
0%
C

Which carbohydrate does not have

C_{x} (H_{2} O)_{y}

$C_x(H_2O)_y$ general formula?

0%
Melitriose
0%
Stachyose
0%
Fructose
0%
Rhamnose

Explanation

Rhamnose is a carbohydrate which does not have

C_{x} (H_{2} O)_{y}

$C_x(H_2O)_y$ general formula. The formula of Rhamnose is

C_{6} H_{12} O_{5}

$\displaystyle C_6H_{12}O_5$

Non-reducing sugar is:

0%
maltose.
0%
sucrose.
0%
lactose.
0%
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

0%
2,6,8
0%
2,6,7
0%
1,5,8
0%
A set of terms other than these

N H_{2} - \underset{C H_{3}}{\underset{|}{C} H} - \overset{O}{\overset{| |}{C}} - N H - C H_{2} - C O_{2} H

$NH_2 - \underset{CH_3}{\underset{|}{C}H} - \overset{O}{\overset{||}{C}} - NH - CH_2 - CO_2H$

Identify the amino acid obtained by hydrolysis of the above compound.

0%
Glycine
0%
Alanine
0%
Both a and b
0%
None of these

Which of the following pair is

C_{2}

$C_2$ epimer?

0%
D-Glucose , D- Maltose
0%
D- Glucose , D- Mannose
0%
D- Allose , D- Ribose
0%
D-Glucose , D- Arabinose

Explanation

D-Mannose differs from D-glucose only at

2

$2$ -carbon atom .

\Rightarrow

$\Rightarrow$ D-Mannose and D-glucose are

C_{2}

$C_{2}$ -epimers.

1175598_992172_ans_3253dea7f03d4a0d8abacb93ea290378.png

D-glucose & D-fructose can be differentiated by :

0%
Fehling solution
0%
Tollens reagent
0%
Benedict test
0%
$Br_2/H_2O$

Explanation

B r_{2} / H_{2} O

$Br_2/H_2O$ being a mild oxidising agent can only oxidise aldose to carboxylic acids but cannot oxidise ketose.

As glucose contains aldehyde group it gets oxidised and converted into a carboxylic acid and is differentiate from fructose which has ketone group.

Therefore, the correct option is D.

One cyclic acetal form of D-galactose is shown.
Which atom is the anomeric carbon?

0%
Atom A
0%
Atom B
0%
Atom C
0%
Atom D
0%
Atom E
0%
Atom F

Explanation

Atom

F

$F$ is anomeric in cyclic acetal form of

D

$D$ galactose as shown in given figure of question.Anomeric carbon is stereo center anomeric carbon is either

α, β

$\alpha,\beta$ depending on position of

- O H

$-OH$ group.If

- O H

$-OH$ group down in cyclic form then

α

$\alpha$ else it is

β

$\beta$ .

Which of the following isomeric sugars is most stable?

Explanation

We will draw its stable form i.e. chair form. If all the bulky group possess equatorial position then the compound is in stable form.

Some

- O H

$-OH$ group are above the plane and some are below the plane. Thus we will draw accordingly.

1115685_993350_ans_3f74984e2cb4493c9c3ae16a6400a246.png

Synthesis of each molecule of glucose in photosynthesis involves:

0%
$6$ molecules of ATP
0%
$18$ molecules of ATP
0%
$10$ molecules of ATP
0%
$8$ molecules of ATP

Explanation

The chemical reaction that takes place during photosynthesis is given below:

6 C O_{2} + 6 H_{2} O \to C_{6} H_{12} O_{2} + 6 O_{2} + 18 A T P + 12 N A D P H

$6CO_2+6H_2O \rightarrow C_6H_{12}O_2+6O_2+18ATP+12NADPH$

Thus, synthesis of each molecule of glucose involves 18 molecules of ATP

Which glycosidic linkage is present in Maltose?

0%
$\alpha -D-\left( + \right) -glucose\left( { C }_{ 1 } \right) -O-\left( { C }_{ 4 } \right) -\alpha-D-\left( + \right) -glucose$
0%
$\alpha -D-\left( + \right) -glucose\left( { C }_{ 1 } \right) -O-\left( { C }_{ 2 } \right) -\beta -D-\left( - \right) -glucose$
0%
$\beta -D-\left( + \right) -glucose\left( { C }_{ 1 } \right) -O-\left( { C }_{ 4 } \right)-\beta -D-\left( + \right) -glucose$
0%
$\beta -D-\left( + \right) -glucose\left( { C }_{ 1 } \right) -O-\left( { C }_{ 4 } \right) -\alpha-D-\left( - \right) -glucose$

The two functional groups present in a typical carbohydrate are :

0%
$-CHO$ and $-COOH$
0%
$-CO$ and $-OH$
0%
$-OH$ and $-CHO$
0%
$-OH$ and $-COOH$

Which among the following is not the example of carbohydrate ?

0%
Glucose
0%
fractose
0%
Maltose
0%
Nylon

Explanation

\to

$\rightarrow$ Carbohydrates are important source of instant energy in our body system.

\to

$\rightarrow$ Honey has been used as instant source of enrgy in ayurvedic medicines.

\to

$\rightarrow$ Carbohydrates are used as storage starch in plants and glycogen

\to

$\rightarrow$ carbohydrates are also used in textile industry.

So, the correct answer is NYLON (It is a synthetic polymer)

One mole of each of glucose and fructose require

x

$x$ and

y

$y$ moles of periodic acid respectively, for oxidation. Hence,

x / y

$x/y$ is

0%
$1/1$
0%
$2/1$
0%
$5/4$
0%
$9/4$

Glucose phosphates formed in photosynthesis are Asymmetrically labeled it is called:

0%
Warbug's effect
0%
Pasteur's effect
0%
Dicken's effect
0%
Gibb's effect

When an apoenzyme is separated from its metal component, its activity is

0%
Decreased
0%
Increased
0%
Lost
0%
Not affected

The tightly bound non proteinaceous organic compound is?

0%
Prosthetic group
0%
Cofactor
0%
Apoenzyme
0%
Holoenzyme

A carbohydrate

X

$X$ having molecular weight

180 g {m o l}^{- 1}

$180g{mol}^{-1}$ 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:

0%
$180$
0%
$210$
0%
$390$
0%
$42$

Which of the following carbohydrate(s) can be hydrolyzed?

0%
Fructose
0%
Sucrose
0%
Glucose
0%
Starch
0%
Maltose

The reagent which may be used to distinguish between cane sugar and glucose solution is

0%
Molusch's reagent
0%
Iodine solution
0%
Baeyer's reagent
0%
Fehling's solution

The

α

$\alpha$ - D glucose and

β

$\beta$ - D glucose differ from each other due to difference in carbon atom with respect to its

0%
Number of $OH$ groups
0%
Size of hemiacetal ring
0%
Conformation
0%
Configuration

Molisch test is answered by

0%
All carbohydrates
0%
Sucrose
0%

Fructose
0%

Glucose

What is the nature of glucose-glucose linkage in starch that males its so susceptible to acid hydrolysis?

0%
Starch is hemiacetal
0%
Starch is acetal
0%
Starch is polymer
0%
Starch contain only few molecules of glucose

Number of

H I O_{4}

$HIO_4$ molecule required to complete oxidation one mole of glucose is :

0%
4
0%
5
0%
6
0%
None of these

Which of the following is the monomer of cellulose?

0%
$\beta-D$ -glucose
0%
Amylose
0%
Amylopectin
0%
Glycogen

Explanation

Monomer of Cellulose is

β - D - g l u c o s e

$\beta - D- glucose$ .
1078750_1134503_ans_cc9aae9dc49c4f64b8b2afe88b72cf72.png

A dextro-rotatory sugar present in fruits is

0%
Glucose
0%
Fructose
0%
Cellulose
0%
Starch

A polypeptide on complete hydrolysis gives three amino acids. How many sequences are possible for that polypeptide?

0%
1
0%
3
0%
6
0%
9

Which of the following is not catalysed by a brush border enzyme?

0%
Maltose $\underrightarrow {Maltase }$ glucose+ glucose
0%
Lactose $\underrightarrow { Lactase }$ glucose+galactose
0%
Starch $\underrightarrow { Amylase}$ Disaccharide
0%
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

0%
are chiral but racemic
0%
have the $L$ configuration at their $\alpha$ carbon
0%
have the $R$ configuration at their $\alpha$ carbon
0%
have the $S$ configuration at their $\alpha$ carbon

Explanation

Glycerine is the only amino acid which is achiral because it has 2 Hydrogen atoms attached to the alpha carbon.

All the amino acids present in proteins have the L configuration at their

α

$\alpha$ carbon.This is because D- Amino Acids are not naturally found in proteins.

So Option b is correct

C_{12} H_{22} O_{11} ⟶ 12 C + {11 H}_{2} O

${ C }_{ 12 }{ H }_{ 22 }{ O }_{ 11 }\longrightarrow 12C+{ 11H }_{ 2 }{ O }$ in presence of concentrated

H_{2} {S O}_{4}

${ H }_{ 2 }{ SO }_{ 4 }$ .

Which of the following is obtained in the above reaction?

0%
Animal charcoal
0%
Sugar charcoal
0%
Coke
0%
Wood charcoal

The volume of 10 N and 4 N HCl required to make 1 L of 7 N HCl are:

0%
0.5 L of 10 N HCl and 0.4 L of 4 N HCl
0%
0.6 L of 10 N HCl and 0.6 L of 4 N HCl
0%
0.8 L of 10 N HCl and 0.7 L of 4 N HCl
0%
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

0%
Carboxyl groups of the amino acids in ${1 }^{ 0 }$ and ${2 }^{ 0 }$ structure
0%
Amino groups of the amino acids in ${1 }^{ 0 }$ and ${2 }^{ 0 }$ structure
0%
R groups of the amino acids in ${3 }^{ 0 }$ structure
0%
Exposed sulphur bonds in ${1 }^{ 0 }$ and ${3 }^{ 0 }$ structure

The two forms of

D -

$D-$ glycopyranose obtained from solution of

D -

$D-$ glucose are known as

0%
Epimers
0%
Anomers
0%
Enantiomers
0%
Geometrical isomers

Rate of reaction depends upon_________?

0%
Temperature
0%
Catalyst
0%
Concentration
0%
All of these

Which of the following does not reduce Benedict's solution?

0%
Sucrose
0%
Aldehyde
0%
Glucose
0%
Fructose

The segment of DNA which acts as the instrumental manual for the synthesis of the protein is:

0%
ribose
0%
gene
0%
nucleoside
0%
nucleotide

Optimum temperature and pH for enzyme.

0%
$20$ - $25^o$ -C and $7$ pH
0%
$20$ - $35^o$ -C and $6.5$ pH
0%
$20$ - $35^o$ -C and $7.5$ pH
0%
All correct

Explanation

The optimum temp of enzymes is 20-35°C. They become inactivated at very low temperature and denatured (destroyed) at very high temp i.e. greater than 45°C. Low molecular weight enzymes are comparatively more heat stable. In archaebacterium Pyrococcus furiosus, the optimum temperature of hydrogenase is greater than 95°C. This heat-stable enzyme enables Pyrococcus to grow at 100°C. The optimum pH of most endoenzyme is pH 7.0 (neutral pH). However, digestive enzymes can function at different pH. For example, salivary amylase act best at pH 6.8, pepsin act best at pH2 etc. Any fluctuation in pH from the optimum causes ionization of R-groups of amino acids which decrease the enzyme activity. Sometimes a change in pH causes the reverse reaction, e.g. at pH 7.0 phosphorylase break down starch into glucose 1- phosphate while at pH5 the reverse reaction occurs.

So, the correct option is '20-25

^{o}

$^o$ C and 7.0 pH'

In plant glycolipids, the sugar is normally.

0%
oil
0%
wax
0%
glycolipid
0%
phospholipid

The ultimate product of hydrolysis of starch is :

0%
glucose
0%
fructose
0%
sucrose
0%
None of these

Explanation

starch is the polymer of glucose hence, on it's hydrolysis we get glucose as a product.

$\text{starch is the polymer of glucose hence, on it's hydrolysis we get glucose as a product.}$

Polynucleotides are ester of sugar with-

0%
Phosphorus acid
0%
Sulphuric acid
0%
Phosphoric acid
0%
Boric acis

Starch is:

0%
$C_{12}H_{22}O_{11}$
0%
$C_6H_{10}O_5$
0%
$(C_6H_{10}O_5)_n$
0%
$(C_6H_{12}O_6)_n$

Explanation

Starch is a polymeric carbohydrate consisting of large number of glucose units joined by glycosidic bonds.

Molecular formula of starch is

(C_{6} H_{10} O_{5}) n

$\left( { C }_{ 6 }{ H }_{ 10 }{ O }_{ 5 } \right) n$

Which among the following is the main constituent of Biogas?

0%
Methane
0%
Propane
0%
Butane
0%
Ethane

Some proteoltic enzymes are-

0%
Trypsin, Erepsin, pepsin
0%
Amylase, lipase, zymase
0%
Ampylopsin, stapsin, ptyalin
0%
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

0%
(A) $\to (Q)$ ,(B) $\to (P)$ , (C) $\to (S)$ , (D) $\to (R)$
0%
(A) $\to (Q)$ ,(B) $\to (R)$ , (C) $\to (S)$ , (D) $\to (P)$
0%
(A) $\to (Q)$ ,(B) $\to (P)$ , (C) $\to (R)$ , (D) $\to (S)$
0%
(A) $\to (R)$ ,(B) $\to (P)$ , (C) $\to (Q)$ , (D) $\to (S)$

Explanation

Lysine - Ninhydrin

Furfural - I naphthol

Benzyl alcohol - ceric ammonium

Styrene -

K M n O_{4}

$KMn{O}_{4}$

Option A is correct

A compound with molecular mass 180 is acylated with

C H_{3} C O C l

$CH_3COCl$ to get a compound with molecular mass

390

$390$ . The number of amino groups present per molecule of former compound is:

0%
$6$
0%
$2$
0%
$5$
0%
$4$

Thiol group is present on:-

0%
Methionine
0%
Cytosine
0%
Cystine
0%
Cysteine

Enzyme which catalyse the joining of C - O, C - S, C - N, P - O bonds :

0%
Lyases
0%
transferases
0%
Hydrolases
0%
ligases

Cobalt as a rare element is essential in the synthesis of this vitamin _______.

0%
$C$
0%
$D$
0%
$B_1$
0%
$B_{12}$

Explanation

(D) Vitamin

B_{12}

$B_{12}$

Because cobalt is also an essential trace element for humans and found at center of

B_{12}

$B_{12}$ and produces red blood cells.

1150439_1293002_ans_683c287852c54593b01b6347a2c3b165.jpg

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

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

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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