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NEET • BIOLOGY • BIOMOLECULES

Biomolecules practice · Hard

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Showing 1-30 of 91 questions
1 Hard
1 of 91
Understanding +4 | -1
All the following statements are true with regard to coconut oil, except:
View answer and explanation
Correct option: D
it contains cholesterol.
Option D (it contains cholesterol) is correct because coconut oil is a plant-derived oil and plants do not produce cholesterol.
2 Hard
2 of 91
Remembering +4 | -1
Most abundant homopolymeric biomolecule in biosphere is
View answer and explanation
Correct option: B
Cellulose
Option B (Cellulose) is correct because cellulose is the most abundant homopolymeric biomolecule in the biosphere, forming the structural component of plant cell walls.
3 Hard
3 of 91
Remembering +4 | -1
Rubber, gums, cellulose are examples for?
View answer and explanation
Correct option: A
Polymeric substances
Option A (Polymeric substances) is correct because rubber, gums, and cellulose are all examples of polymers, which are large molecules made up of repeating subunits.
4 Hard
4 of 91
Remembering +4 | -1
Enzymes isolated from organisms which line in extreme high temperatures show catalytic activity in a range of?
View answer and explanation
Correct option: C
80−90∘C80 - 90^\circ C
Option C (80−90∘C80 - 90^\circ C) is correct because enzymes from thermophilic organisms, which thrive in extremely high temperatures, typically exhibit optimal catalytic activity in the range of 80-90°C.
5 Hard
5 of 91
Remembering +4 | -1
Which of the following type of biomolecules upon ionization from zwitter ions?
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Correct option: C
Amino acids
Option C (Amino acids) is correct because amino acids contain both an amino group and a carboxyl group, allowing them to form zwitterions upon ionization.
6 Hard
6 of 91
Understanding +4 | -1
Denaturation of DNA is accompanied by the following changes except:
View answer and explanation
Correct option: A
Increase in viscosity
Option A (Increase in viscosity) is correct because denaturation of DNA leads to a decrease in viscosity due to the separation of strands, not an increase.
7 Hard
7 of 91
Understanding +4 | -1
In gluconeogenesis, which of the following cannot acts as substrate
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Correct option: A
Fructose
Option B (Palmitic acid) is correct because fatty acids like palmitic acid cannot be converted to glucose through gluconeogenesis.
8 Hard
8 of 91
Remembering +4 | -1
The proteinaceous molecule that joins a non – protein prosthetic group to form a functional enzyme, is called?
View answer and explanation
Correct option: A
Apoenzyme
Option A (Apoenzyme) is correct because the apoenzyme is the protein portion of an enzyme that requires a prosthetic group (non-protein) to form a functional holoenzyme.
9 Hard
9 of 91
Understanding +4 | -1
Select the false statement I. Living process is a constant effort to prevent falling into equilibrium II. Energy can enter and leave a cell III. Matter can enter and leave a cell IV. Metabolic pathways are interlinked
View answer and explanation
Correct option: A
Only I
Option A (Only I) is correct because living processes actively prevent reaching equilibrium, making statement I false.
10 Hard
10 of 91
Understanding +4 | -1
Assertion (A): Biomolecules which are found in the acid insoluble fraction are consider as macromolecules.

Reason (R): Biomolecules found in acid insoluble fraction have molecular weight more than 1000 Dalton.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Option A is correct because macromolecules are found in the acid insoluble fraction and have a molecular weight greater than 1000 Daltons.
11 Hard
11 of 91
Remembering +4 | -1
Inhibin is composed of
View answer and explanation
Correct option: A
glycoprotein
Option A (glycoprotein) is correct because inhibin is a hormone composed of a protein bound to a carbohydrate, making it a glycoprotein.
12 Hard
12 of 91
Understanding +4 | -1
Assertion: Human diet should compulsorily contain glycine, serine and tyrosine.
Reason: Essential amino acids can be synthesized in the human body.
View answer and explanation
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.
13 Hard
13 of 91
Understanding +4 | -1
Assertion (A): All monosaccharide give Benedict's test.

Reason (R): All monosaccharide contain free aldehyde or ketonic group.
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 all monosaccharides have a free aldehyde or ketone group, allowing them to reduce Benedict's reagent.
14 Hard
14 of 91
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.
15 Hard
15 of 91
Understanding +4 | -1
Stability of a substrate molecule is dependent on?
A) Energy    \,\,\, B) Structure    \,\,\, C) Enzyme
View answer and explanation
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.

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16 Hard
16 of 91
Understanding +4 | -1
The number of 'ends' in a glycogen molecule would be
View answer and explanation
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.
17 Hard
17 of 91
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
View answer and explanation
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.
18 Hard
18 of 91
Remembering +4 | -1
Which bond is found in lipid?
View answer and explanation
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.
19 Hard
19 of 91
Application +4 | -1
In a DNA molecule, if the number of phosphodiester bonds is 198, it has ____ bases.
View answer and explanation
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.
20 Hard
20 of 91
Remembering +4 | -1
Which of the following is the constituent of glycerol?
View answer and explanation
Correct option: A
3C3C, 3−OH3-OH group
Option A (3C3C, 3−OH3-OH group) is correct because glycerol is a three-carbon molecule with three hydroxyl (-OH) groups, one attached to each carbon.
21 Hard
21 of 91
Remembering +4 | -1
Each protein has – amino acids?
View answer and explanation
Correct option: A
20
Option A (20) is correct because there are 20 standard amino acids that are commonly found in proteins.
22 Hard
22 of 91
Remembering +4 | -1
Aromatic amino acids are
View answer and explanation
Correct option: A
Phenylalanine, tryptophan, tyrosine
Option A (Phenylalanine, tryptophan, tyrosine) is correct because these are the three standard amino acids with aromatic side chains.
23 Hard
23 of 91
Understanding +4 | -1
Read the following statements carefully and choose the option that is incorrectly explained.
View answer and explanation
Correct option: D
The sugar found in polynucleotides is always ribose.
Option D (The sugar found in polynucleotides is always ribose) is incorrectly explained because DNA contains deoxyribose, while RNA contains ribose.
24 Hard
24 of 91
Analyzing +4 | -1
Mark the odd pair in the followings
View answer and explanation
Correct option: C
Glycerol – Fatty acids
Option C (Glycerol – Fatty acids) is correct because glycerol and fatty acids are components *of* lipids, not building blocks linked together to form a larger molecule.
25 Hard
25 of 91
Application +4 | -1
What is the formula of a polypeptide consisting of 10-glycine molecule?

The formula of glycine is C2H5NO2{C_2}{H_5}N{O_2}
View answer and explanation
Correct option: D
C20H32O11N10{C_{20}}{H_{32}}{O_{11}}{N_{10}}
The correct answer is C20H32O11N10{C_{20}}{H_{32}}{O_{11}}{N_{10}} because each peptide bond formation removes one water molecule, so 9 water molecules are removed from 10 glycine molecules.
26 Hard
26 of 91
Remembering +4 | -1
All the following radionuclei are used in the study of DNA except:
View answer and explanation
Correct option: D
51Cr{ }^{51} {Cr}
Option D (51Cr{ }^{51} {Cr}) is correct because 14C{ }^{14} {C}, 32P{ }^{32} {P}, and 15 N{ }^{15} {~N} are commonly used to label DNA components (bases, phosphate, and nitrogenous bases respectively), while 51Cr{ }^{51} {Cr} is not typically used in DNA studies.
27 Hard
27 of 91
Remembering +4 | -1
Every enzyme in IUB system of classification has been given a code number which consists of
View answer and explanation
Correct option: C
4 Digits
Option C (4 Digits) is correct because the IUB system assigns a 4-digit code to each enzyme for classification.
28 Hard
28 of 91
Understanding +4 | -1
Assertion (A): Amino acids are interliked by hydrogen bonds to form secondary structure in a polypeptide chain.

Reason (R): Beta pleated sheet and alpha helices are secondary structures shown by polypeptide chain.
View answer and explanation
Correct option: B
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
Option B (Both (A) & (R) are true but the (R) is not the correct explanation of the (A)) is correct because amino acids are interlinked by peptide bonds, not hydrogen bonds, to form the secondary structure, but beta pleated sheets and alpha helices are indeed secondary structures.
29 Hard
29 of 91
Remembering +4 | -1
Identify set of polysaccharides from the following
View answer and explanation
Correct option: D
Glycogen, Cellulose, Starch
Option D (Glycogen, Cellulose, Starch) is correct because glycogen, cellulose, and starch are all polysaccharides.
30 Hard
30 of 91
Understanding +4 | -1
Select false statements for an enzyme promoting a chemical reaction by
(i) Lowering the energy of activation.
(ii) Causing the release of heat, which acts as a primer.
(iii) Increasing molecular motion.
(iv) Changing the free energy difference between substrate and product.
View answer and explanation
Correct option: C
(ii), (iii) and (iv)
Option B ((ii) and (iii)) is correct because enzymes lower the activation energy, but do not cause the release of heat, increase molecular motion, or change the free energy difference.
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  • ✓ This set contains 91 single-correct-answer MCQs on BIOMOLECULES.
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