NCERT NEET MCQs Biomolecules

MCQ Type

Lipid are found in acid insoluble fraction during the analysis of chemical composition of tissues. Given the reason
a) It has very high molecular weight
b) It is polymer
c) It has low molecular weight
d) On grinding, the bio membranes are broken into pieces and form insoluble vesicles
Choose the element which is negligible in living matter
a) Si b) Mg c) Ca d) S
Name the plant pigments present in the following
I. Carrots
II. Tomatoes
a) I-Tycopene II-Carotene b) I-Carotene II-Lycopene
c) I-Leucopene II-Carotene d) None of the above
Which one of the following structural formulae of two organic compounds is correctly identified
along with its related function? a) A- Triglyceride major-Source of energy
b) B- Uracil -A component of DNA
c) A-Lecithin -A component of cell membrane
d) B-Adenine -A nucleotide that makes up nucleic acids

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Silk consists of
a) Central core of sericin b) Central core of fibroin
c) Both (a) and (b) d) A fine mixture of fibroin and sericin
Which statement regarding coenzyme is incorrect?
a) Every coenzyme is a cofactor and every cofactor is a coenzyme
b) Every coenzyme is a cofactor but every cofactor is not a coenzyme
c) Most of the coenzymes are nucleotides and are composed of vitamins
d) Coenzymes are the active constituents of enzymes
The rate of the reaction doubles or decreases by half, for every… °C change in either direction
a) 10° b) 15° c) 20° d) 27°
Enzyme often have additional parts in their structures that are made up of molecules other than
proteins. When this additional chemical part is an organic molecule, it is called
a) Cofactor b) Coenzyme c) Substrate d) Both (a) and (b)
Which one is amino acid?
a) Pepsin b) Proline c) Cysteine d) Rennin
The sum total composition of acid soluble and acid insoluble fraction pool represents the
a) Molecular b) Dead cells c) Gene library d) Cellular pool
The ‘lock’ and ‘key’ model of enzyme action illustrates that a particular enzyme molecule
a) May be destroyed and re synthesised several times
b) Interacts with a specific type of substrate molecule
c) Reacts at identical rates under all conditions
d) Forms a permanent enzyme-substrate complex
Acidic amino acids carry two −COOH and one −NH2 groups per molecule. Keeping this in mind, select the
correct pair of acidic amino acid
a) Lysine and arginine b) Aspartic acid and glutamic acid
c) Glycine and alanine d) Both (a) and (b)
After doing the chemical analysis of organic compounds found in living organisms, two fractions were
observed namely
a) Acid soluble pool and acid insoluble pool
b) Carbon pool and hydrogen pool
c) Inorganic pool and organic pool
d) Aqueous pool and non-aqueous pool
Which one is not an example for hydrolases?
a) Dehydrogenase b) Protease c) Amylase d) Esterase
Which type of protein is present in human skin?
a) Primary proteins b) Secondary proteins
c) Tertiary proteins d) Quaternary proteins
The metabolic flow is called
a) Dynamic state of body constituents
b) Flow of traffic junctions
c) Turn over flow
d) Adiabatic flow of reactions
Read the two reaction A and B given below and select the correct option accordingly
A. ADP + Pi → ATP
B. ATP → ADP + Pi
a) A-Endergonic; B-Exergonic
b) A-Exergonic; B-Endergonic
c) A-Endergonic; B-Endergonic

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d) A-Exergonic; B-Exergonic

The pyrimidine base, which confers additional stability to DNA over RNA, is
a) Adenine b) Guanine c) Cytosine d) Thymine
If the total amount of adenine and thymine in a double-stranded DNA is 60%, then the amount of
guanine in this DNA will be
a) 15% b) 20% c) 30% d) 40%
An enzyme extract when subjected to electric field, separates into two fractions each catalyzing
the same reaction. These fractions are
a) Allosteric enzymes b) Isoenzymes c) Inducible enzymes d) Coenzymes
Amino acids the substituted methanes. Name the four substituent groups occupying the four valency
positions
a) Hydrogen, carboxyl group, amino group and a
variable group (R)
b) Two carboxyl groups amino group and OH
c) Two hydrogen, one carboxyl group, amino group
and a variable group (R)
d) Two amino groups, one hydrogen and one
carboxyl group
The ‘lock’ and ‘key’ theory of enzyme structure and function was proposed by
a) Morgan b) Robertson c) Brown d) Fischer
Histone octamer contains
a) Eight types of histones b) Eight histones of four different types
c) Five histones d) Six types of histones
What is grape sugar?
a) Glucose b) Fructose c) Sucrose d) Galactose
Pepsin is an ……enzyme
a) Intracellular b) Extracellular c) Both (a) and (b) d) None of these
Which one is a polymer?
a) Sucrose b) Glycogen c) Fructose d) Lactose
Which of the following statements are correct?
I. Acetic acid can form cholesterol
II. Flow of metabolites through metabolic pathway has a definite rate and direction. It is called dynamic
state of body constituents
III. Anabolic pathway is endergonic while catabolic pathway is exergonic
IV. All biomolecules have a term over, 𝑖.𝑒., they are constantly being changed into some other
biomolecules and also made from other biomolecules
The correct options is
a) All are correct b) I and II are correct
c) Only IV is correct d) All are wrong
An α-helix is the example of …… protein structure
a) Primary b) Secondary c) Tertiary d) Quaternary
Which is a reducing sugar?
a) Galactose b) Gluconic acid
c) β- methyl galactoside d) Sucrose
Formation of glycogen from glucose is called
a) Glycogenolysis b) Glycogenesis c) Glycolysis d) Gluconeogenesis
Which of the following statements are correct for polysaccharides?
I. The polysaccharides are found as a part of the acid insoluble pellet
II. These are long chains of sugars
III. They are threads containing different monosaccharides as building blocks
IV. Cellulose is a polymeric polysaccharide consisting of only one type of monosaccharide 𝑖.𝑒., fructose

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a) All are correct b) All are correct except IV
c) III and IV d) Only IV is correct

Select the false statement
I. Living process is a constant effort to promote falling into equilibrium
II. Energy can enter and leave a cell
III. Matter can enter and leave a cell
IV. Metabolic pathways are interlinked
a) Only I b) Only IV c) I and IV d) Only II
Arachidonic acid is
a) Non-essential fatty acid b) Essential fatty acid
c) Polyunsaturated fatty acid d) Both (b) and (c)
Inulin is a polymer of
a) Glucose b) Galactose c) Fructose d) Arabinose
Table sugar consists of
a) Lactose b) Sucrose c) Maltose d) glucose
For nucleic acids, the building block is a
a) Nucleotide b) Nucleoside c) Polynucleotide d) Sugar
An example of feedback inhibition is
a) Cyanide action on cytochrome
b) Sulpha drug on folic acid synthesizer bacteria
c) Allosteric inhibition of hexokinase by glucose 6-phosphate
d) Reaction between succinic dehydrogenase and succinate
The term metabolism means
a) The sum of all the enzymatically catalysed chemical reactions constantly taking place in the cells and
tissues of the living organisms
b) Processes that change the small molecules into larger ones
c) Processes that converts the large molecules into smaller ones
d) None of the above
Chitin is a
a) Polysaccharide b) Nitrogenous polysaccharide
c) Lipoprotein d) protein
Richest energy compound is
a) Creatine phosphate b) Protein c) Carbohydrate d) fat
Select the wrong statement.
a) The building blocks of lipids are amino acids
b) Majority of enzymes contain a non-protein part called the prosthetic group
c) The thylakoids are arranged one above the other like a stack of coins forming a granum
d) Crossing over occurs at pachytene stage of meiosis-I
Which of the following is an essential amino acids?
a) Valine b) Leucine c) Tryptophan d) All of these
The aggregation of the various kinds of biomolecules in a cell is referred to as the
a) Acid soluble pool b) Acid insoluble pool
c) Cellular pool d) None of the above
Secondary metabolites can be observed in
a) Plant cells b) Fungal cells c) Microbial cells d) All of these
Select the secondary metabolites from the list given below
I. alkaloids
II. flavonoids

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III. rubber
IV. essential oils
V. antibiotics
VI. coloured pigments
VII. scents
VIII. gums
IX. spices
Choose the correct option
a) I to IX b) All except II and IX c) I, III, IV and VI d) All except I and VII

What is the starting point in the production of food?
a) Catabolism b) Metabolism c) Anabolism d) Photosynthesis
Name the amino acids 𝐴−𝐶 correctly a) A-Glycine, B-Serine, C-Alanine b) A-Alanine, B-Glycine, C-Serine
c) A-Serine, B-Glycine, C-Alanine d) A-Serine, B-Alanine, C-Glycine
Name the heterocyclic compounds which are known as nitrogenous bases
Choose the most appropriate options
a) Adenine, guanine, uracil, cytosine and thymine
b) Adenine, guanine, uracil and thymine
c) Adenine, guanine, cytosine, uracil
d) None of these
In which one of the following enzymes copper is necessarily associated as an activator?
a) Carbonic anhydrase b) Tryptophanase
c) Lactic dehydrogenase d) Tyrosinase
Identify the structural formulae and select the correct option a) A-Adenine, B-Adenosine, C-Adenylic acid b) A-Guanine, B-Adenosine, C-Adenylic acid
c) A-Adenosine, B-Adenylic acid, C-Adenine d) A-Uracil, B-Adenosine, C-Adenylic acid
The regulation of the chemical composition of blood and body fluids and other aspects of its internal
environment by an organism to maintain the physiological process is called
a) Entropy b) Enthalpy c) Homeostasis d) Metabolism
Name the term given to the left and right ends of a polysaccharide

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a) Left end−N−terminal end, Right
end−C−terminal end b) Left end−reducing end, Right end−non-reducing
end
c) Left end− non-reducing end, Right end−reducing
end d) Left end−C−terminal end, Right
end−N−terminal end

‘G’ in DNA strand base pairs with ‘C’ by 3… bonds
a) Hydrogen b) Von der Waal c) Covalent d) Ionic
The inhibitor which inhibits the enzyme activity by binding to the active site of the enzyme, due to the
close resemblance to the substrate in its molecular structure is called
a) Non-competitive inhibitor b) Competitive inhibitor
c) Allosteric modulator d) Feedback inhibitor
Select the correct pair of substituted purines
a) Cytosine and thymine b) Adenine and guanine
c) Uracil and cytosine d) Guanine and uracil
Which one of the following is wrongly matched?
a) Fungi – Chitin b) Phospholipid – Plasma membrane
c) Enzyme – Lipopolysaccharide d) ATP – Nucleotide derivative
Amino acids are organic compounds and are called α-amino acids. Why?
a) Amino acids are organic compounds containing an amino group and acidic group as substituents n two
different carbons
b) Amino acids are organic compounds containing an amino group and an acidic group as substituents on
the same carbon
c) Amino acids are inorganic compounds containing an amino group and acidic group as substituents on
two different carbons
d) Amino acids are inorganic compounds containing an amino group and acidic group as substituents on
the same carbon
Enzymes that catalyze inter-conversion of optical, geometrical or positional isomers, are
a) Ligases b) Lyases c) Hydrolases d) Isomerases
All the carbon compounds obtained from living tissues are named as
a) Biomolecules b) Inorganic compounds
c) Organic compounds d) Only DNA
A fatty acid has a carboxyl group attached to 𝑅 group. The R group could be a
a) Methyl b) Ethyl
c) Higher number of −CH2 groups (1 to 19 carbons) d) All of the above
With reference to enzymes, which one of following statements is true?
a) Apoenzyme=Holoenzyme+Coenzyme b) Holoenzyme=Apoenzyme+Coenzyme
c) Coenzyme=Apoenzyme+Holoenzyme d) Holoenzyme=Coenzyme+Apoenzyme
Benedict’s reagent test is conducted to confirm the presence of
a) Polysaccharides like starch b) Lipids
c) Reducing sugars d) proteins
When a metabolic disequilibrium is in effect, then only cells continue to function
How do cells avoid reaching metabolic equilibrium?
a) Use feedback inhibition to turn off pathways
b) The products of one reaction become the reactant of another reaction and are unable to accumulate
c) Cellular metabolism utilises only those reactions that are irreversible
d) Providing constant supply of enzymes
Which of the following radioisotope is not suitable for DNA labeling based studies?
a) H3 b) P32 c) N15 d) S35
Jacob and Monod named some enzymes as allosteric, whose activity is regulated by

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a) End product b) Substrate c) A by-product d) Coenzyme

Identify the term ‘ash’ in term of living tissue sample analysis from the statements given below

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