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CBSE Questions for Class 12 Engineering Chemistry Biomolecules Quiz 11 - MCQExams.com
CBSE
Class 12 Engineering Chemistry
Biomolecules
Quiz 11
Which of the following is the sweetest sugar?
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0%
Sucrose
0%
Glucose
0%
Fructose
0%
Maltose
Explanation
Fructose
is the sweetest sugar.
The aqueous solution of carbohydrate gave a dark blue colour with iodine solution. The carbohydrate is:
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0%
glucose
0%
fructose
0%
sucrose
0%
starch
Explanation
$$Starch +I_2\rightarrow Blue\,colour$$
$$\text{When you put iodine on the carbohydrate samples, one of them will turn dark blue and the other will be a}$$ $$\text{reddish-brown. iodine is an indicator that turns dark blue in the presence of starch.}$$
Which of the following hormones contains iodine?
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0%
Testosterone
0%
Adrenaline
0%
Thyroxine
0%
Insulin
Explanation
Thyroxine hormone contains
iodine.
The thyroid gland produces two primary hormones - thyroxine (also referred to as
T
4
) and tri-iodothyronine (also referred to as
T
3
). The numbers 3 and 4 refer to the number of atoms of iodine in the hormones. Iodine is essential for the production of thyroid hormones. Iodine is found in most foods, especially seafood.
A mixture of amlyose and amylopectin is
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0%
lactose
0%
starch
0%
cellulose
0%
sucrose
Explanation
Starch is
a mixture
of two polymers:
amylose and amylopectin
. Natural starches consist of about 10%–30%
amylose
and 70%–90%
amylopectin
.
A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?
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0%
Three
0%
Four
0%
One
0%
Two
Explanation
A sequence of
three nucleotides
in messenger RNA makes a codon for an amino acid. A codon is a sequence of
three
adjacent nucleotides constituting the genetic code that determines the insertion of a specific amino acid in a polypeptide chain during protein synthesis or the signal to stop protein synthesis.
The commonest disaccharide has the molecular formula:
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$$C_{10}H_{18}O_{9}$$
0%
$$C_{10}H_{20}O_{10}$$
0%
$$C_{11}H_{22}O_{11}$$
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$$C_{12}H_{22}O_{11}$$
Explanation
$$\text{Disaccharides are the carbohydrates which on hydrolysis gives two same or different carbohydrates. }$$
$$Sucrose\text{ is the most common disaccharide.}$$ It can be found in many fruits and is naturally occuring.
It has molecular formula $$C_{12}H_{22}O_{11}.$$
Option D is correct.
The two functional groups present in a typical carbohydrate are:
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$$-OH$$ and $$-COOH$$
0%
$$-CHO$$ and $$-COOH$$
0%
0%
$$-OH$$ and $$-CHO$$
Explanation
$$\text{Carbohydrates are polyhydroxy aldehydes or polyhydroxy ketones OR compounds which give aldehydic as well}$$ $$\text{as ketonic groups on hydrolysis. Therefore the major functional groups are (carbonyl) Aldehyde, Ketone, and}$$ $$\text{hydroxy groups. }$$
Options C, D are correct.
Which one are polysaccharides?
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0%
Sucrose
0%
Insulin
0%
Starch
0%
Cellulose
Explanation
Sucrose is a monosaccharide whereas insulin, starch and cellulose are polysaccharides.
Monomer of nucleic acid is
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0%
nucleotides
0%
nucleosides
0%
amino acids
0%
carboxylic acid
Explanation
The term
nucleic acid
is the overall name for DNA and
RNA
. They are composed of nucleotides, which are the
monomers
made of three components: a 5-carbon sugar, a phosphate group and a nitrogenous base.
General formula for carbohydrates is
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0%
$$C_nH_{2n}O_{2n+2}$$
0%
$$C_x(H_2O)_{2x}$$
0%
$$C_x(H_2O)_y$$
0%
None of these
Explanation
Carbohydrates are hydrates of carbon. Their general formula is $$C_x(H_2O)_y$$
Maltose on hydrolysis gives
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0%
Mannose + glucose
0%
Galactose + glucose
0%
Glucose
0%
Mannose + fructose
Explanation
$$ \begin{matrix} C_{12}H_{22}O_{11} \\ Maltose \end{matrix}+H_2O \xrightarrow [(From \ yeast)]{Maltase} \begin{matrix} 2C_6H_{12}O_6 \\ Glucose \end{matrix} $$
The formation of starch in plants results from
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0%
photosynthesis
0%
photolysis
0%
flash photolysis
0%
none of the above
Explanation
Reaction taking place during Photosynthesis:
$$6CO_2 + 6H_2O \rightarrow \underset{Glucose}{C_6H_{12}O_6} + 6O_2$$
This Glucose polymerise and form starch.
Hence, The formation of starch in plants results from
Photosynthesis.
Hence, Option"A" is correct answer
State whether the following statements are True or False:
Glucose is more sweeter than fructose
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0%
True
0%
False
Explanation
False-Fructose is more sweeter than glucose
Which of the following is carbohydrate
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0%
Leucine
0%
Albumin
0%
Inulin
0%
Maltase
Explanation
Inulin is a carbohydrate which is stored in "Roots of Dahliya".
Which one is a disaccharide
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0%
Glucose
0%
Fructose
0%
Xylose
0%
Sucrose
Explanation
$$\text{Disaccharide}$$, also called double sugar, any substance that is $$\text{composed of two molecules of simple sugars}$$ $$(monosaccharides)$$ linked to each other. Disaccharides are $$\text{crystalline water-soluble}$$ compounds.
$$\text{sucrose — common table sugar = glucose + fructose.}$$
which is polysaccharide
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0%
Starch
0%
Cellulose
0%
Glycogen
0%
All of these
Explanation
$$\text{Polysaccharides are long chains of carbohydrate molecules,}$$ specifically polymeric carbohydrates composed of monosaccharide units bound together by $$\text{glycosidic linkages.}$$ This carbohydrate can react with water using amylase enzymes at catalyst, which produces constituent sugars.
there are three common and principal types of polysaccharide include, $$\text{cellulose, starch and glycogen,}$$ all made by joining together molecules of glucose in different ways.
A carbohydrates consists of
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0%
C and O
0%
C,H and O
0%
C,H,N and O
0%
C and H
Explanation
Carbohydrates (also called saccharides) are molecular compounds made from just three elements: $$\text{Carbon, Hydrogen and Oxygen.}$$
The sugar present in fruits is
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0%
Fructose
0%
Glucose
0%
Sucreose
0%
Galactose
Explanation
All fruit contains some natural sugar. Very sweet fruits, including mangoes and watermelons, have relatively high sugar content. $$\text{Fruit contains two types of sugar: fructose and glucose.}$$ The proportions of each vary, but most fruits are about half glucose and half fructose.
Which of the following compound is an amino acid?
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0%
0%
0%
0%
Explanation
The compounds in which both amino $$(-NH_{2})$$ as well as acidic $$(-COOH)$$ group is present is called amino acid.
Canesugar on hydrolysis gives :
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Glucose and maltose
0%
Glucose and lactose
0%
Glucose and fructose
0%
Only glucose
Explanation
$$C_{12}H_{22}O_{11}+H_2O\rightarrow C_6H_{12}O_6+C_6H_{12}O_6$$
To become a carbohydrate a compound must contain at least :
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0%
2 carbons
0%
3 carbons
0%
4 carbons
0%
6 carbons
Explanation
3 carbons e.g, Glyceraldehyde
Which of the following is disaccharide
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0%
Lactose
0%
Starch
0%
Cellulose
0%
Glucose
Explanation
disaccharide (also called a double sugar or bivose) is the sugar formed when two monosaccharides (simple sugars) are joined by $$\text{glycosidic linkage.}$$
Lactose, the disaccharide of milk, consists of galactose joined to $$\text{glucose by a β-1,4-glycosidic linkage.}$$ Lactose is hydrolyzed to these monosaccharides by lactase in human beings
Which of the following carbohydrate is a disaccharide
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0%
Glucose
0%
Fructose
0%
Raffinose
0%
Maltose
Explanation
disaccharide is the sugar formed when two monosaccharides are joined by glycosidic linkage. Like monosaccharides, disaccharides are soluble in water. Three common examples are sucrose, lactose, and $$maltose$$
Starch is a ploymer of
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Glucose
0%
Fructose
0%
Both a and b
0%
None of these
Explanation
$$\text{Starch is polymer of glucose,}$$ a sugar molecule made up of carbon (C), hydrogen (H), and oxygen (O) with a basic chemical formula $$C_6H_{12}O_6$$. Since it is only made of glucose, starch is considered a $$\text{homosaccharaide,}$$ a chain of sugars made of one type of molecule
Which among the following is the simplest
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0%
Glucose
0%
Cellulose
0%
Starch
0%
None of these
Explanation
Glucose is the simplest carbohydrate i.e. mono saccharide rest
are polysaccharide.
A sugar, that is not a disaccharide, among the following is
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0%
Lactose
0%
Galactose
0%
Sucrose
0%
Maltose
Explanation
disaccharide is the sugar formed when two monosaccharides are joined by $$glycosidic \ linkage.$$ Like monosaccharides, disaccharides are soluble in water. Three common examples are sucrose, lactose, and maltose.
$$Galactose\ is\ a \ monosaccharide$$. When combined with glucose (monosaccharide), through a condensation reaction, the result is the disaccharide lactose. The hydrolysis of lactose to glucose and galactose is catalyzed by the enzymes lactase and β-galactosidase.
When amylase catalyse the hydrolysis of starch, the final product obtained is chiefly
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0%
Cellobiose
0%
Glucose
0%
Maltose
0%
Sucrose
Explanation
$$Starch \overset{Amylase}{\rightarrow}Maltose$$
Which of the following is the sweetest sugar
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0%
Glucose
0%
Fructose
0%
Lactose
0%
Sucrose
Explanation
Sugar Relative sweetness
Sucrose 100
Glucose 74
Lactose 16
Fructose 173
In polysaccharides the linkage connecting monosaccharide units is called
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Glycoside linkage
0%
Nucleoside linkage
0%
Glycogen linkage
0%
Peptide linkage
Explanation
That is called glycosidic linkage.
Which of the following is a disaccharide
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0%
Glucose
0%
Ribulose
0%
Lactose
0%
Arabinose
Explanation
disaccharide is the sugar formed when two monosaccharides are joined by glycosidic linkage. Like monosaccharides, disaccharides are soluble in water. Three common examples are sucrose, $$lactose,$$ and maltose.
Lactose, the disaccharide of milk, consists of galactose joined to glucose by a β-1,4-glycosidic linkage. Lactose is hydrolyzed to these monosaccharides by lactase in human beings
Which of the following is correct statement
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0%
Troleins are amino acid
0%
$$\alpha$$-hydrogen is present in fructose
0%
Starch is polymer of $$\alpha$$-glucose
0%
Amylose is compound of cellulose
Explanation
Starch is polymer of alpha glucose.
Which among the following is the simplest sugar
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0%
Glucose
0%
Cellulose
0%
Starch
0%
Glycogen
Explanation
Glucose is a monosaccharide while others are polysaccharide.
So glucose is the simplest sugar.
On hydrolysis, which produces only glucose
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0%
Galactose
0%
Maltose
0%
Sucrose
0%
None
Explanation
$$C_{12}H_{22}O_{11}+H_2O\underset{Hydrolysis}{\rightarrow}C_{6}H_{12}O_6+C_6H_{12}O_6$$
Glucose Glucose
The disaccharide present in milk is
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0%
Maltose
0%
Lactose
0%
Sucrose
0%
Cellobiose
Explanation
Lactose is present in milk (Glucose + Galactose).
Vitamin $$B_1$$ is
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0%
Riboflavin
0%
Cobalamin
0%
Thiamine
0%
Pyridoxine
Explanation
Vitamin $$B_1$$ is thiamine. Its main source is cereals.
Which one of the following is an amino acid
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0%
$$CH_3CONH_2$$
0%
$$CH_3CONHCH_3$$
0%
$$CH_3NHCHO$$
0%
$$NH_2CH_2.COOH$$
Explanation
Glycine $$\rightarrow NH_2-CH_2-COOH$$
Nucleic acid is a polymer of
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0%
Nucleosides
0%
$$\alpha$$ amino acids
0%
Nucleotides
0%
Glucose
Explanation
Nucleic acid is a polymer of nucleotides.
Which synthesis was done by Stainley Millar
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0%
Amino acid
0%
Protein
0%
Virus
0%
Vitamin
Explanation
Amino acid synthesis was done by stainley millar.
Which one of the following is a polysaccharide
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0%
Nylon
0%
Amylose
0%
Ribose
0%
Polyethylene
Explanation
Amylose is a polysaccharide.
Which of the following is not an acidic amino acid
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0%
Lysine
0%
Arginine
0%
Aspartic acid
0%
Histidine
Explanation
Aspartic acid is an amino acid with acidic side chain.
Ribose is an example of
Report Question
0%
Ketohexose
0%
Aldopentose
0%
Disaccharide
0%
Aldohexose
Explanation
Ribose is an example of aldopentose.
Starch consists of two fractions, one is $$\alpha-$$amylose and the other is:
Report Question
0%
Amylopectin
0%
Glycogen
0%
Pecticamide
0%
Alginic acid
Explanation
Starch is a polymeric carbohydrate consisting of numerous glucose units joined by glycosidic bonds.
It consists of two types of molecules, the linear and helical $$\alpha-$$ amylose and the branched amylopectin.
Depending on the plant, starch generally contains 20 to 25% amylose and 75 to 80% amylopectin by weight.
Hence, option $$A$$ is correct.
Plants generally take up nitrates and nitrites and convert them into amino acids which are used to make carbohydrates.
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0%
True
0%
False
Explanation
This process is known as assimilation.
Chemical messengers are
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0%
Hormones
0%
Enzymes
0%
Vitamins
0%
Nucleic acids
The molecular formula of most common disaccharide is :
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$$ (C_6H_{12}O_6)_6 $$
0%
$$ (C_{12}H_{22}O_{11}) $$
0%
$$ (C_{10}H_{22}O_{11}) $$
0%
$$ (C_{18}H_{22}O_{11}) $$
The sequence in nucleic acid is
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0%
Base-sugar-phosphate
0%
Sugar-base-phosphate
0%
Phosphate-base-sugar
0%
Base-phosphate-sugar
Players and manual labour are advised to take more of-
Report Question
0%
Protein
0%
Fats
0%
Carbohydrates
0%
Mineral
Explanation
Players and manual labours expend a lot of energy. Carbohydrates are a quick and very efficient sources of energy in the form of ATP. A single glucose molecule releases about 36 molecules of ATP.
Hence, they are advised to eat carbohydrate rich food like Rice, Wheat, plain Sugar, banana etc in greater quantities.
So, the correct answer is '
Carbohydrates'
In nucleic acid, nucleotides are attached to one another by
Report Question
0%
Hydrogen bond
0%
Peptide bond
0%
Phosphorous group
0%
Glycosidic bond
Alanine is an example of
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0%
Alpha-amino acid
0%
B-fructose
0%
Gamma-lactose
0%
Delta-cellulose
Enzymes are
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0%
Carbohydrates
0%
Proteins
0%
Fats
0%
Salts
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