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NEET • BIOLOGY • BIOMOLECULES

Biomolecules practice · Easy

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61 Easy

61 of 98

Understanding +4 | -1

When you take cells or tissue pieces and grind them with an
acid in a mortar and pestle, all the small biomolecules dissolve
in the acid. Proteins, polysaccharides and nucleic acids are
insoluble in mineral acid and get precipitated. The acid soluble
compounds include aminoacids, nucleosides, small sugars etc.
When one adds a phosphate group to a nucleoside one gets
another acid soluble biomolecule called

View answer and explanation

Correct option: D

Nucleotide

Option D (Nucleotide) is correct because adding a phosphate group to a nucleoside results in a nucleotide, a fundamental building block of nucleic acids.

62 Easy

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Understanding +4 | -1

Amino acids are organic compounds and are called α-amino acids. Why?

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Correct option: B

Amino acids are organic compounds containing an amino group and an acidic group as substituents on the same carbon

The correct answer is B because α-amino acids have both amino and acidic groups attached to the same (alpha) carbon atom.

63 Easy

63 of 98

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Secondary metabolites can be observed in

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Correct option: D

All of these

Option D (All of these) is correct because secondary metabolites can be observed in plant, fungal, and microbial cells.

64 Easy

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Assertion: RuBisCO is most abundant protein in the whole
biosphere
Reason: RuBisCO is present in all animal cells

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Correct option: C

If the assertion is true but the reason is false

Option C is correct because while RuBisCO is the most abundant protein in the biosphere, it is not present in all animal cells.

65 Easy

65 of 98

Understanding +4 | -1

The sum total composition of acid soluble and acid insoluble fraction pool represents the

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Correct option: D

Cellular pool

Option D (Cellular pool) is correct because the sum of acid-soluble and insoluble fractions represents the entire cellular content.

66 Easy

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Remembering +4 | -1

Proteins are heteropolymers which are madeup of …… type of monomers of amino acids

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Correct option: C

Option C (20) is correct because proteins are made up of 20 different types of amino acids.

67 Easy

67 of 98

Understanding +4 | -1

Due to discovery of which of the following in 1980 the
evolution was termed as RNA world?

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Correct option: C

RNA have enzymatic property

Option C (RNA have enzymatic property) is correct because the discovery of ribozymes (RNA molecules with enzymatic activity) in 1980 supported the RNA world hypothesis.

68 Easy

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Remembering +4 | -1

Select the correct constituents of protein

View answer and explanation

Correct option: C

Carbon, hydrogen, nitrogen, oxygen and sulphur

Option A is incorrect. Option B is incorrect. Option D is incorrect. Option C (Carbon, hydrogen, nitrogen, oxygen and sulphur) is correct because proteins are composed of these elements.

69 Easy

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All the chemical reactions occurring in living organisms are called

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Correct option: A

Metabolism

Option A (Metabolism) is correct because metabolism is the sum of all chemical reactions in living organisms.

70 Easy

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Remembering +4 | -1

Amino acids the substituted methanes. Name the four substituent groups occupying the four valency positions

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Correct option: A

Hydrogen, carboxyl group, amino group and a variable group (R )

Option A (Hydrogen, carboxyl group, amino group and a variable group (R )) is correct because these are the four groups attached to the central carbon atom in an amino acid.

71 Easy

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Remembering +4 | -1

A bond formed between carboxyl group of one amino acid and amino group of adjacent amino acid, is called

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Correct option: A

Peptide bond

Option A is correct because a peptide bond is formed between the carboxyl group of one amino acid and the amino group of another.

72 Easy

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Understanding +4 | -1

Assertion (A) In the solutions of different pH, structure of
amino acids changes
Reason (R) It is because of the ionisable nature of 3/4

N{H_2}

and 3/4

COOH

groups

View answer and explanation

Correct option: A

If both A and R are true and R is the correct explanation
of A

The correct answer is A because the structure of amino acids changes with pH due to the ionizable nature of the amino and carboxyl groups.

73 Easy

73 of 98

Remembering +4 | -1

Name the heterocyclic compounds which are known as nitrogenous bases
Choose the most appropriate options

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Correct option: A

Adenine, guanine, uracil, cytosine and thymine

Option A (Adenine, guanine, uracil, cytosine and thymine) is correct because these are the five nitrogenous bases found in nucleic acids (DNA and RNA).

74 Easy

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Understanding +4 | -1

Choose the correct options

View answer and explanation

Correct option: B

E + S ⇌ ES → E - P → E + P

Option B (E + S ⇌ ES → E - P → E + P) is correct because it represents the correct sequence of events in an enzyme-catalyzed reaction, including the reversible formation of the enzyme-substrate complex.

75 Easy

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Remembering +4 | -1

An α-helix is the example of …… protein structure

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Correct option: B

Secondary

Option B (Secondary) is correct because an α-helix is a specific type of secondary protein structure formed by hydrogen bonds.

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76 Easy

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Which enzyme is most specific?

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Correct option: D

Nuclease

Option C (Sucrase) is correct because sucrase is highly specific, catalyzing the hydrolysis of sucrose only.

77 Easy

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Understanding +4 | -1

Study the components given in the box below :

\mathrm{Na}^{+}, \mathrm{K}^{+}, \mathrm{H}_2 \mathrm{O}, \mathrm{CaCO}_3, \mathrm{PO}_4^{3-}, \mathrm{SO}_4^{2-}

How many of the above given components represent inorganic constituents of living tissues?

View answer and explanation

Correct option: B

Option B (6) is correct because all the listed components (

\mathrm{Na}^{+}

\mathrm{K}^{+}

\mathrm{H}_2 \mathrm{O}

\mathrm{CaCO}_3

\mathrm{PO}_4^{3-}

\mathrm{SO}_4^{2-}

) are inorganic constituents of living tissues.

78 Easy

78 of 98

Remembering +4 | -1

The term metabolism means

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Correct option: A

The sum of all the enzymatically catalysed chemical reactions constantly taking place in the cells and tissues of the living organisms

Option A (The sum of all the enzymatically catalysed chemical reactions constantly taking place in the cells and tissues of the living organisms) is correct because metabolism encompasses all chemical processes within an organism.

79 Easy

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Remembering +4 | -1

Phospholipids are

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Correct option: A

Conjugated lipids

Option A (Conjugated lipids) is correct because phospholipids contain a lipid component conjugated with a phosphate group and often other molecules like choline.

80 Easy

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The most abundant chemical in living organisms is

View answer and explanation

Correct option: B

Water

Option B (Water) is correct because water is the most abundant chemical compound found in living organisms.

81 Easy

81 of 98

Application +4 | -1

A dehydration reaction links two glucose molecules to produce maltose. If the formula for glucose is

{C_6}{H_{12}}{O_6}

then what is the formula for the maltose?

View answer and explanation

Correct option: D

{C_{12}}{H_{22}}{O_{11}}

Option D (

{C_{12}}{H_{22}}{O_{11}}

) is correct because a dehydration reaction removes one water molecule (

{H_2O}

) when two glucose molecules (

{C_6}{H_{12}}{O_6}

) combine.

82 Easy

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Remembering +4 | -1

Which of the following is the simplest amino acid?

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Correct option: C

Glycine

Option C (Glycine) is the simplest amino acid because its R-group is just a hydrogen atom.

83 Easy

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Inulin is a polymer of

View answer and explanation

Correct option: C

Fructose

Option C (Fructose) is correct because inulin is a polysaccharide composed of fructose units.

84 Easy

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Hydrolysis of lipid yields?

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Correct option: B

Fatty acids and glycerol

Option B (Fatty acids and glycerol) is correct because lipids are broken down into these components during hydrolysis.

85 Easy

85 of 98

Application +4 | -1

One strand of DNA has sequence of nucleotide 3’ ATTCGCTAT 5’ then other strand of DNA has

View answer and explanation

Correct option: D

5’ TAAGCGATA 3’

Option D (5’ TAAGCGATA 3’) is correct because DNA strands are antiparallel and complementary, so A pairs with T and C pairs with G, and the sequence is reversed.

86 Easy

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Remembering +4 | -1

One turn of DNA has nucleotide pairs

View answer and explanation

Correct option: D

Option D (10) is correct because one complete turn of the DNA double helix contains approximately 10 base pairs.

87 Easy

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Understanding +4 | -1

Assertion: Linolenic acid is the precursor of arachidonic
acid.
Reason: Ascorbic acid is a sugar acid having

N{H_2}

group.

View answer and explanation

Correct option: C

If the assertion is true but the reason is false

Option C (If the assertion is true but the reason is false) is correct because Linolenic acid is a precursor of arachidonic acid, but ascorbic acid is not a sugar acid having an

N{H_2}

group.

88 Easy

88 of 98

Understanding +4 | -1

Pick the odd statement out

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Correct option: D

Metabolic pathways always follows a linear route

Option D (Metabolic pathways always follows a linear route) is correct because metabolic pathways can be linear, branched, or cyclic, not always linear.

89 Easy

89 of 98

Understanding +4 | -1

The ‘lock’ and ‘key’ model of enzyme action illustrates that a particular enzyme molecule

View answer and explanation

Correct option: B

Interacts with a specific type of substrate molecule

Option B (Interacts with a specific type of substrate molecule) is correct because the lock and key model describes the high specificity of enzymes for their substrates, where the enzyme's active site has a shape complementary to the substrate.

90 Easy

90 of 98

Remembering +4 | -1

Organic acids having a hydrocarbon chain and end in a carboxylic group are called?

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Correct option: B

Fatty acids

Option B (Fatty acids) is correct because they fit the description of organic acids with a hydrocarbon chain and a carboxylic group.

Revision notes and key takeaways

Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.

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