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NEET • BIOLOGY • BIOMOLECULES

Biomolecules practice · Mixed difficulty

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Showing 61-90 of 331 questions

61 Easy

61 of 331

Understanding +4 | -1

Select the biomolecule in which phosphate group is esterified to the sugar.

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Correct option: D

\mathrm{ADP}

Option D (ADP) is correct because in ADP (Adenosine Diphosphate), the phosphate groups are esterified to the sugar ribose.

62 Medium

62 of 331

Remembering +4 | -1

Protein uptake in nucleus occurs by

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Correct option: D

GTP hydrolysis in nucleus

Option D (GTP hydrolysis in nucleus) is correct because the import of proteins into the nucleus is an energy-dependent process that requires GTP hydrolysis within the nucleus.

63 Medium

63 of 331

Understanding +4 | -1

Identify the incorrect pair.

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Correct option: B

Drugs - Ricin

The correct answer is B because Ricin is a toxin, not a drug. Drugs are substances used for medicinal purposes.

64 Medium

64 of 331

Analyzing +4 | -1

Select the odd one w.r.t. the nucleosides.

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Correct option: A

Cytosine

Option A (Cytosine) is the odd one out because Cytosine is a nitrogenous base, while Guanosine, Adenosine, and Uridine are nucleosides (nitrogenous base + sugar).

65 Easy

65 of 331

Remembering +4 | -1

The rate of the reaction doubles or decreases by half, for every… °C change in either direction

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Correct option: A

{10^0}

Option A (

{10^0}

) is correct because the rate of reaction typically doubles or halves for every 10°C change, which is described by the temperature coefficient.

66 Medium

66 of 331

Understanding +4 | -1

Monomeric units are NOT the same in

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Correct option: C

Insulin

Option C (Insulin) is correct because it is a protein, not a polysaccharide, and therefore its monomeric units are amino acids, not the same as the other options.

67 Hard

67 of 331

Understanding +4 | -1

Assertion: Human diet should compulsorily contain glycine, serine and tyrosine.
Reason: Essential amino acids can be synthesized in the human body.

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Correct option: D

If both Assertion and Reason are false

Option D is correct because humans can synthesize glycine, serine, and tyrosine, so they are not essential amino acids.

68 Easy

68 of 331

Remembering +4 | -1

The pyrimidine base, which confers additional stability to DNA over RNA, is

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Correct option: D

Thymine

Option D (Thymine) is correct because thymine has a methyl group that provides additional stability to DNA compared to RNA's uracil.

69 Easy

69 of 331

Remembering +4 | -1

Select the secondary metabolites from the list given below
I. alkaloids
II. flavonoids
III. rubber
IV. essential oils
V. antibiotics
VI. coloured pigments
VII. scents
VIII. gums
IX. spices
Choose the correct option

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Correct option: A

I to IX

Option A (I to IX) is correct because all listed items (alkaloids, flavonoids, rubber, essential oils, antibiotics, coloured pigments, scents, gums, and spices) are secondary metabolites.

70 Hard

70 of 331

Understanding +4 | -1

Assertion (A): All monosaccharide give Benedict's test.

Reason (R): All monosaccharide contain free aldehyde or ketonic group.

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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 all monosaccharides have a free aldehyde or ketone group, allowing them to reduce Benedict's reagent.

71 Easy

71 of 331

Remembering +4 | -1

The most abundant molecule in cell, is

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Correct option: A

Water

Option A (Water) is correct because water is the most abundant molecule in a cell, essential for cellular processes.

72 Medium

72 of 331

Remembering +4 | -1

Which one of the following is polysaccharide?

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Correct option: A

Glycogen

Option A (Glycogen) is correct because glycogen is a polysaccharide, a complex carbohydrate made of many glucose units.

73 Easy

73 of 331

Remembering +4 | -1

In a polypeptide chain, a β-pleated sheet is an example of

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Correct option: A

2° structure

Option A (2° structure) is correct because a β-pleated sheet is a type of secondary structure in a polypeptide chain.

74 Medium

74 of 331

Remembering +4 | -1

Which of the following are alkaloids?

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Correct option: D

2 and 3

Option D (2 and 3) is correct because both codeine and morphine are alkaloids, which are nitrogen-containing organic compounds.

75 Easy

75 of 331

Understanding +4 | -1

Which of the following statements is false regarding SDS-polyacrylamide gel electrophoresis?

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Correct option: D

SDS is used to maintain the 3-dimensional structure of protein

Option D is false because SDS denatures proteins and coats them with a negative charge, it does not maintain the 3D structure.

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76 Medium

76 of 331

Application +4 | -1

In an experiment it was found that adenine constitutes 31% and guanine 19%. The quantity of cytosine in this DNA is likely to be

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Correct option: A

0.19

Option A (0.19) is correct. In this DNA, A=T and G=C. Since A=31% and G=19%, then T=31% and C=19%.

77 Hard

77 of 331

Remembering +4 | -1

Which of the following is not a conjugated protein?

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Correct option: A

Peptone

Option A (Peptone) is correct because peptone is a mixture of peptides and amino acids, not a conjugated protein.

78 Medium

78 of 331

Remembering +4 | -1

One of the secondary structures exhibited by DNA is…..

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Correct option: B

Watson-Crick model

Option B (Watson-Crick model) is correct because the Watson-Crick model describes the double helix structure of DNA, which is a secondary structure.

79 Easy

79 of 331

Remembering +4 | -1

What is grape sugar?

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Correct option: A

Glucose

Option A (Glucose) is correct because glucose is commonly referred to as grape sugar due to its abundance in grapes.

80 Medium

80 of 331

Understanding +4 | -1

Which of the following are not secondary metabolites in plants?

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Correct option: D

Amino acids, glucose

The correct answer is D because amino acids and glucose are primary metabolites, essential for basic growth and development, while the others are secondary metabolites.

81 Hard

81 of 331

Understanding +4 | -1

Stability of a substrate molecule is dependent on?
A) Energy

\,\,\,

B) Structure

\,\,\,

C) Enzyme

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Correct option: C

A, B only

Option C (A, B only) is correct because the stability of a substrate molecule depends on its energy and structure, but not directly on the enzyme.

82 Easy

82 of 331

Understanding +4 | -1

Choose a primary metabolite with phosphorylated organic compound in its structure.

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Correct option: D

Lecithin

Option D (Lecithin) is correct because it is a phospholipid, containing a phosphate group in its structure.

83 Easy

83 of 331

Understanding +4 | -1

Which of the following statements are correct?

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Correct option: A

Living steady state has a self regulatory mechanism called homeostasis

Option D (All of the above) is the correct answer because living steady state involves homeostasis, energy flow follows thermodynamics, and metabolism involves energy exchange.

84 Hard

84 of 331

Understanding +4 | -1

The number of 'ends' in a glycogen molecule would be

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Correct option: A

equal to the number of branches plus one

Option A (equal to the number of branches plus one) is correct because each branch creates a new non-reducing end, and there's one additional non-reducing end at the end of the main chain.

85 Hard

85 of 331

Understanding +4 | -1

Read the following statements. Which of the following statements about RNA molecule is incorrect?
I) It has a double helical structure
II) It contains ribose which is a cyclic aldopentose monosaccharide
III) It is the genetic material in all animal viruses.
IV) It contains the ribothymidylic acid

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Correct option: A

I, III and IV only

Option A (I, III and IV only) is correct because RNA is single-stranded, is not the genetic material in all animal viruses, and does not contain ribothymidylic acid.

86 Medium

86 of 331

Remembering +4 | -1

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

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Correct option: B

Competitive inhibitor

Option B (Competitive inhibitor) is correct because a competitive inhibitor binds to the active site, resembling the substrate.

87 Medium

87 of 331

Remembering +4 | -1

These are projected inside from the polynucleotide backbone

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Correct option: A

Nitrogen bases

Option A (Nitrogen bases) is correct because in the DNA double helix, the nitrogenous bases project inward from the sugar-phosphate backbone, forming complementary base pairs.

88 Hard

88 of 331

Remembering +4 | -1

Which bond is found in lipid?

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Correct option: B

Ester bond

Option B (Ester bond) is correct because lipids are formed by the esterification of fatty acids with glycerol or other alcohols.

89 Hard

89 of 331

Application +4 | -1

In a DNA molecule, if the number of phosphodiester bonds is 198, it has ____ bases.

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Correct option: B

200

Option B (200) is correct because in a linear DNA molecule, the number of phosphodiester bonds is equal to the number of bases minus 1 for each strand, so with 198 bonds, there are 198+2 = 200 bases.

90 Medium

90 of 331

Remembering +4 | -1

Types of amino acids found in proteins are

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Correct option: C

Option C (20) is correct because there are 20 standard amino acids commonly found in proteins.

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