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NEET • BIOLOGY • BIOMOLECULES

Biomolecules practice · Hard

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61 Hard

61 of 91

Remembering +4 | -1

Which bond is responsible of formation of polysaccharide?

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Correct option: C

Glycosidic

Option C (Glycosidic) is correct because glycosidic bonds link monosaccharides to form polysaccharides.

62 Hard

62 of 91

Understanding +4 | -1

Identify the true statement from the below.

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Correct option: B

Palmitic acid has 16 carbon including the carboxyl carbon

Option B (Palmitic acid has 16 carbon including the carboxyl carbon) is correct because palmitic acid is a saturated fatty acid with 16 carbon atoms, including the carboxyl carbon.

63 Hard

63 of 91

Understanding +4 | -1

Fats in the body are formed when:

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Correct option: C

extra glycogen storage in liver and muscles is stopped.

Option C (extra glycogen storage in liver and muscles is stopped) is correct because when glycogen storage is full, excess carbohydrates are converted to fats.

64 Hard

64 of 91

Remembering +4 | -1

Which of the following polysaccharide is wrongly matched with its monomer?

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Correct option: C

Inulin - Mannose

Option C (Inulin - Mannose) is correct because inulin is a polymer of fructose, not mannose.

65 Hard

65 of 91

Understanding +4 | -1

Read the following statements on lipids and find out correct set of statements:
(a) Lecithin found in the plasma membrane is a glycolipid
(b) Saturated fatty acids possess one or more c = c bonds
(c) Gingely oil has lower melting point, hence remains as oil in winter
(d) Lipids are generally insoluble in water but soluble in some organic solvents
(e) When fatty acid is esterified with glycerol, monoglycerides are formed
Choose the correct answer from the options given below:

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Correct option: D

(c), (d) and(e) only

Option D ((c), (d) and(e) only) is correct because gingely oil has a lower melting point, lipids are generally insoluble in water, and esterification of fatty acids with glycerol forms monoglycerides.

66 Hard

66 of 91

Remembering +4 | -1

Double sugar is

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Correct option: D

All of the above

Option D (All of the above) is correct because table sugar (sucrose), milk sugar (lactose), and sugar in germinating seeds (maltose) are all disaccharides, also known as double sugars.

67 Hard

67 of 91

Understanding +4 | -1

Michaelis Menten constant (

{K_m}

) is equal to:-

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Correct option: C

Substrate concentration at which the reaction attains half of its maximum velocity

Option C (Substrate concentration at which the reaction attains half of its maximum velocity) is correct because the Michaelis-Menten constant (

K_m

) is defined as the substrate concentration at which the reaction rate is half of

V_{max}

68 Hard

68 of 91

Remembering +4 | -1

A competitive inhibitor of succinic dehydrogenase is

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Correct option: A

Malonate

Option A (Malonate) is correct because malonate is a competitive inhibitor of succinate dehydrogenase due to its structural similarity to succinate.

69 Hard

69 of 91

Understanding +4 | -1

The

{3^1} - {5^1}

phosphodiester linkages inside a polynucleotide chain serve to join?

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Correct option: C

One nucleotide with another nucleotide

Option C (One nucleotide with another nucleotide) is correct because the 3'-5' phosphodiester linkage connects the 3' carbon of one nucleotide's sugar to the 5' carbon of the next nucleotide's sugar in a polynucleotide chain.

70 Hard

70 of 91

Understanding +4 | -1

Choose the correct statements
I. Bond energy (ATP) is utilised for biosynthesis, osmotic and mechanical work that we perform
II. When glucose is degraded into lactic acid in our muscles, energy of liberated
III. Assembly of a proteins from amino acids requires energy
IV. Majority of metabolic reactions can occur in isolation
V. There are many examples of uncatalysed metabolic reactions

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Correct option: A

Except IV and V

Option A (Except IV and V) is correct because statements I, II, and III are accurate descriptions of energy utilization and metabolic processes, while statements IV and V are incorrect.

71 Hard

71 of 91

Remembering +4 | -1

Which of the following is an amino acid, which is metabolised by the brain?

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Correct option: D

Glutamic acid

Option D (Glutamic acid) is correct because glutamic acid is a major excitatory neurotransmitter in the brain and is metabolized by brain cells.

72 Hard

72 of 91

Remembering +4 | -1

The sulphur is the constituents of :

a. Thymines

b. Methionine

c. Lecithin

d. Coenzyme A

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Correct option: D

Only b, d

Option D (Only b, d) is correct because Methionine and Coenzyme A both contain sulfur.

73 Hard

73 of 91

Remembering +4 | -1

Transfer of amino group from one amino acid to the keto group of keto acid is catalysed by:-

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Correct option: A

Transaminase

Option A (Transaminase) is correct because transaminases catalyze the transfer of an amino group from an amino acid to a keto acid.

74 Hard

74 of 91

Analyzing +4 | -1

Choose the odd statement w.r.t. enzymes

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Correct option: B

Succinic dehydrogenase enzyme is inhibited by a non-competitive inhibitor called malonate

Option B is correct because malonate is a competitive inhibitor of succinic dehydrogenase, not a non-competitive inhibitor.

75 Hard

75 of 91

Remembering +4 | -1

Lecithin is a?

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Correct option: C

Phospholipid

Option C (Phospholipid) is correct because lecithin contains a phosphate group, making it a type of phospholipid.

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76 Hard

76 of 91

Remembering +4 | -1

Water molecules are connected by

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Correct option: C

H-bond

Option C (H-bond) is correct because water molecules are connected to each other through hydrogen bonds.

77 Hard

77 of 91

Understanding +4 | -1

The differences in D and L forms of sugars are based on:

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Correct option: B

configuration of

{H}

and

{OH}

groups around the penultimate carbon.

Option B is correct because D and L forms of sugars are based on the configuration of H and OH groups around the penultimate carbon atom.

78 Hard

78 of 91

Remembering +4 | -1

C{H_3} - {\left( {C{H_2}} \right)_{14}} - COOH

it shows?

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Correct option: C

Palmitic acid

Option C (Palmitic acid) is correct because the formula represents a 16-carbon saturated fatty acid.

79 Hard

79 of 91

Understanding +4 | -1

Assertion (A): GLUT-4 is one of the essential protein for bioenergetics of the cell.

Reason (R): GLUT-4 enables glucose transport into cell.

View answer and explanation

Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Option A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) is correct because GLUT-4 is essential for cellular bioenergetics by enabling glucose transport into cells.

80 Hard

80 of 91

Application +4 | -1

{C_6}{H_{12}}{O_6} + A\xrightarrow{\,}\,2{C_3}{H_4}{O_3} + B

A

and

B

in the above reaction are

View answer and explanation

Correct option: D

{O_2},\,\,\,2{H_2}O

Option A (Dissolving

CO_2

in water) is the wrong entry because while

CO_2

dissolves in water, it's not typically considered an enzyme-mediated reaction in the same way as the other options.

81 Hard

81 of 91

Understanding +4 | -1

Given below are two statements A and B. Choose the correct answer related to the statements.
Statement A: Amino acids are amphoteric in their function.
Statement B: All amino acids are necessary for our body.

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Correct option: A

Statement A is correct but statement B is wrong

Option A is correct because amino acids possess both acidic (carboxyl) and basic (amino) groups, making them amphoteric, while not all amino acids are essential.

82 Hard

82 of 91

Understanding +4 | -1

Assertion (A): Glucose is commonest sugar which provides energy on hydrolysis.

Reason (R): Glucose is the precursor of all the types of carbohydrates.

View answer and explanation

Correct option: D

Both (A) and (R) are false

Option D (Both (A) and (R) are false) is correct because glucose is not the commonest sugar providing energy on hydrolysis, and it's not the precursor of all types of carbohydrates.

83 Hard

83 of 91

Analyzing +4 | -1

Analyse the equations given below and select the reaction that belongs to the fourth class of enzyme as per the classification of IUB.

View answer and explanation

Correct option: D

Fructose 1,6- bisphosphate

\xrightarrow[{}]{{\mathrm{aldolase}}}

Dihydroxyacetone phosphate + Glyceraldehyde 3- Phosphate

Option D is correct because it represents a reaction catalyzed by a lyase, which is the fourth class of enzymes according to IUB classification. Lyases catalyze the breaking of bonds without hydrolysis or oxidation.

84 Hard

84 of 91

Remembering +4 | -1

Which one of the following is widely distributed in a cell?

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Correct option: B

RNA

Option B (RNA) is correct because RNA is found in various parts of the cell, including the nucleus, cytoplasm, and ribosomes, playing roles in protein synthesis and gene regulation.

85 Hard

85 of 91

Understanding +4 | -1

Which of the following statements regarding fats is true?

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Correct option: B

Glycerol is trihydroxy propane

Option B (Glycerol is trihydroxy propane) is correct because glycerol is a three-carbon alcohol with three hydroxyl groups, making it trihydroxypropane.

86 Hard

86 of 91

Remembering +4 | -1

The molecular weight of bio micromolecules found in acid soluble pool ranges between

View answer and explanation

Correct option: D

18 to 800 Daltons

Option D (18 to 800 Daltons) is correct because the molecular weight of bio micromolecules in the acid soluble pool typically ranges from 18 to 800 Daltons.

87 Hard

87 of 91

Understanding +4 | -1

When a metabolic disequilibrium is in effect, then only cells continue to function
How do cells avoid reaching metabolic equilibrium?

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Correct option: C

Cellular metabolism utilises only those reactions that are irreversible

Option B (The products of one reaction become the reactant of another reaction and are unable to accumulate) is correct because the continuous flow of metabolites prevents the system from reaching equilibrium.

88 Hard

88 of 91

Remembering +4 | -1

All the following amino acids aromatic, except

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Correct option: D

Valine

Option D (Valine) is correct because valine is a branched-chain amino acid and does not contain an aromatic ring.

89 Hard

89 of 91

Remembering +4 | -1

___ is the most abundant protein in animal world and ___ is the most abundant protein in the whole biosphere?

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Correct option: A

Collagen, RUBISCO

Option A (Collagen, RUBISCO) is correct because collagen is the most abundant protein in the animal world, and RUBISCO is the most abundant protein in the entire biosphere.

90 Hard

90 of 91

Understanding +4 | -1

Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it ?

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Correct option: A

Adenine, thymine - Purines

Option A (Adenine, thymine - Purines) is correct because adenine is a purine, but thymine is a pyrimidine.

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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