Back to BIOMOLECULES
Your Progress
0 / 141 Answered
0
Correct
0
Incorrect
0%
Accuracy
JEE • CHEMISTRY • BIOMOLECULES
Biomolecules practice · Easy
Choose an answer to check it, or open “View answer” to study the explanation. Sign in to save progress to your account.
Practice format and chapter quiz
These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.
Take a chapter quiz →
Showing 91-120 of 141 questions
Preparing practice and saved progress…
91
Easy
91 of 141
Remembering
+4 | -1
Proteins are composed of:
View answer and explanation
Correct option: D
Amino acids
Option D (Amino acids) is correct because proteins are polymers made up of amino acid monomers linked by peptide bonds.
92
Easy
92 of 141
Remembering
+4 | -1
Which of the following compounds are not used as disinfectants?
(A) Chloroxylenol
(B) Bithional
(C) Veronal
(D) Prontosil
(E) Terpineol
Choose the correct answer from the options given below:
(A) Chloroxylenol
(B) Bithional
(C) Veronal
(D) Prontosil
(E) Terpineol
Choose the correct answer from the options given below:
View answer and explanation
Correct option: B
C, D
Option B (C, D) is the correct answer because Veronal and Prontosil are not used as disinfectants; they serve other purposes (Veronal is a barbiturate, and Prontosil is a prodrug antibacterial).
93
Easy
93 of 141
Remembering
+4 | -1
Vitamin A is also known as:
View answer and explanation
Correct option: A
Xerophythol
Option A (Xerophythol) is correct because Vitamin A is also known as retinol or xerophythol, playing a key role in vision, immune function, and cell growth.
94
Easy
94 of 141
Remembering
+4 | -1
When glucose reacts with bromine water the main product is
View answer and explanation
Correct option: D
Gluconic acid
Option D (Gluconic acid) is correct because the reaction of glucose with bromine water oxidizes the aldehyde group to a carboxylic acid group, forming gluconic acid.
95
Easy
95 of 141
Remembering
+4 | -1
An alkali salt of palmitic acid is known as:
View answer and explanation
Correct option: C
A soap
Option C (A soap) is correct because alkali salts of fatty acids, like palmitic acid, are soaps.
96
Easy
96 of 141
Understanding
+4 | -1
Glucose and cane sugar can be distinguished by:
View answer and explanation
Correct option: A
Fehling’s solution
Option A (Fehling’s solution) is correct because glucose is a reducing sugar that can reduce Fehling's solution, while cane sugar (sucrose) is a non-reducing sugar and cannot.
97
Easy
97 of 141
Understanding
+4 | -1
Glucose gives silver mirror with ammoniacal silver nitrate because it has
View answer and explanation
Correct option: A
Aldehyde group
Option A (Aldehyde group) is correct because glucose gives a silver mirror test due to the presence of the aldehyde (-CHO) group.
98
Easy
98 of 141
Remembering
+4 | -1
Which of the following amino acid is optically inactive?
View answer and explanation
Correct option: A
Glycine
Option A (Glycine) is correct because glycine is the only amino acid without a chiral carbon atom, making it optically inactive.
99
Easy
99 of 141
Understanding
+4 | -1
Hydrolysis of oils and fats gives glycerol and long chain fatty acids containing:
View answer and explanation
Correct option: C
Both (a) and (b)
Option C (Both (a) and (b)) is correct because fatty acids obtained from hydrolysis of oils and fats can contain both even and odd numbers of carbon atoms, though even numbers are more common.
100
Easy
100 of 141
Analyzing
+4 | -1
Pick out the one which does not belong to the family
View answer and explanation
Correct option: B
Cellulose
The correct answer is Cellulose because Pepsin, Ptyalin, and Lipase are all enzymes, while Cellulose is a polysaccharide and not an enzyme.
101
Easy
101 of 141
Remembering
+4 | -1
The anti-sterility or anti-reproductory vitamin is:
View answer and explanation
Correct option: D
E
Option D (E) is correct because Vitamin E is known as the anti-sterility or anti-reproductory vitamin.
102
Easy
102 of 141
Analyzing
+4 | -1
Which differs from the rest?
View answer and explanation
Correct option: A
Glucose
Option A is correct because glucose is a monosaccharide, while maltose, sucrose, and lactose are disaccharides.
103
Easy
103 of 141
Remembering
+4 | -1
The tripeptide hormone present in most living cells is
View answer and explanation
Correct option: A
Glutathione
Option A (Glutathione) is correct because glutathione is a tripeptide found in most living cells, composed of glycine, glutamic acid, and cysteine.
104
Easy
104 of 141
Remembering
+4 | -1
The vitamin that is most readily manufactured in our bodies is:
View answer and explanation
Correct option: D
Vitamin D
Option D (Vitamin D) is correct because our bodies can synthesize Vitamin D when exposed to sunlight.
105
Easy
105 of 141
Remembering
+4 | -1
Raffinose is
View answer and explanation
Correct option: A
Trisaccharide
Option A (Trisaccharide) is correct because raffinose is composed of three monosaccharide units: glucose, fructose, and galactose.
Explore Other Chapters in CHEMISTRY
View All →
106
Easy
106 of 141
Remembering
+4 | -1
Which of the following compounds is responsible for the transmission of heredity characters?
View answer and explanation
Correct option: B
DNA
Option B (DNA) is correct because DNA (Deoxyribonucleic acid) is responsible for the transmission of hereditary characters.
107
Easy
107 of 141
Remembering
+4 | -1
The hormone thyroxine
View answer and explanation
Correct option: B
Is secreted by thyroid
Option B (Is secreted by thyroid) is correct because thyroxine, also known as T4, is a hormone produced and secreted by the thyroid gland.
108
Easy
108 of 141
Remembering
+4 | -1
The energy change produced by the combustion of foods is called the ‘calorific value’. The best calorific value is given by:
View answer and explanation
Correct option: B
Fats
Option B (Fats) is correct because fats provide the highest calorific value compared to proteins, carbohydrates, and vitamins.
109
Easy
109 of 141
Remembering
+4 | -1
Which of the following is absent in DNA?
View answer and explanation
Correct option: A
Option A (U) is correct because Uracil (U) is a nitrogenous base found in RNA, not DNA, where Thymine (T) is present instead.
110
Easy
110 of 141
Remembering
+4 | -1
Night blindness is caused by deficiency of vitamin :
View answer and explanation
Correct option: B
Option B (Vit-A) is correct because Vitamin A (retinol) is essential for the formation of rhodopsin, a light-sensitive pigment in the retina, and its deficiency leads to night blindness.
111
Easy
111 of 141
Understanding
+4 | -1
A nanopeptide contains ……. peptide linkages.
View answer and explanation
Correct option: B
8
Option B (8) is correct because a nanopeptide, consisting of 9 amino acids, will have 8 peptide linkages.
112
Easy
112 of 141
Application
+4 | -1
There are 20 naturally occurring amino acids. The maximum number of tripeptides that can be obtained is
View answer and explanation
Correct option: A
8000
Option A (8000) is correct because with 20 amino acids, the number of tripeptides is 20*20*20 = 8000.
113
Easy
113 of 141
Remembering
+4 | -1
The polymer formed with more than two monosaccharides units is known as:
View answer and explanation
Correct option: B
Polysaccharide
Option B (Polysaccharide) is correct because polysaccharides are polymers composed of more than two monosaccharide units.
114
Easy
114 of 141
Remembering
+4 | -1
Which of the following carbohydrates is synthesized by nature on the largest scale?
View answer and explanation
Correct option: D
Cellulose
Option D (Cellulose) is correct because cellulose is the most abundant organic polymer on Earth, synthesized by plants on a massive scale.
115
Easy
115 of 141
Remembering
+4 | -1
A source of oleic acid is:
View answer and explanation
Correct option: B
Corn oil
Option B (Corn oil) is correct because corn oil is a significant source of oleic acid, a monounsaturated fatty acid.
116
Easy
116 of 141
Remembering
+4 | -1
Hardening of fat (lipid) is due to
View answer and explanation
Correct option: A
Hydrogenation
Option A (Hydrogenation) is correct because hardening of fat involves the addition of hydrogen to unsaturated fatty acids, converting them into saturated fatty acids.
117
Easy
117 of 141
Remembering
+4 | -1
One gram of fat gives:
View answer and explanation
Correct option: C
More than twice the energy as one gram of carbohydrate or protein
Option C (More than twice the energy as one gram of carbohydrate or protein) is correct because fats provide approximately 9 kcal/gram, while carbohydrates and proteins provide approximately 4 kcal/gram.
118
Easy
118 of 141
Remembering
+4 | -1
Paraffin wax is not used:
View answer and explanation
Correct option: C
In greases
Option C (In greases) is correct because paraffin wax is not typically used as a primary component in greases; greases usually consist of a lubricating oil thickened with a soap or other thickener.
119
Easy
119 of 141
Analyzing
+4 | -1
Which of the following does not contain bond?
View answer and explanation
Correct option: A
Adenine
Option A is correct because Adenine does not contain a bond, while Guanine, Thymine, and Uracil do.
120
Easy
120 of 141
Remembering
+4 | -1
Aqueous solution of carbohydrate with 2 drops of alcoholic solution of -naphthol and gives a ring at the junction. The colour of the ring is:
View answer and explanation
Correct option: C
Violet
Option C (Violet) is correct because the Molisch test, which uses -naphthol and sulfuric acid, produces a violet ring at the junction when carbohydrates are present.
Revision notes and key takeaways
Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.
Showing 91-120 of 141 questions