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NEET • BIOLOGY • BIOMOLECULES
Biomolecules practice · Mixed difficulty
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1
Medium
1 of 331
Understanding
+4 | -1
Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?
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Correct option: A
Ester bonds
Option A is correct because ester bonds are primarily involved in the formation of lipids and are less likely to be directly involved in stabilizing protein folding compared to hydrogen bonds, electrostatic interactions, and hydrophobic interactions.
2
Hard
2 of 331
Understanding
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All the following statements are true with regard to coconut oil, except:
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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.
3
Medium
3 of 331
Remembering
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Which of the following is the example of structural protein?
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Correct option: D
All of these
Option D (All of these) is correct because myosin, collagen, and keratin are all examples of structural proteins.
4
Easy
4 of 331
Understanding
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Choose the correct statement w.r.t. proteins
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Correct option: C
GLUT – 4 is a transporter which enables glucose transport into cells
Option C is correct because GLUT-4 is a glucose transporter protein that facilitates glucose uptake into cells.
5
Medium
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Understanding
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Why living state cannot afford to reach equilibrium?
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Correct option: B
To remain active all the time
Option B (To remain active all the time) is correct because living organisms need to constantly perform work and maintain their complex organization, which requires being in a non-equilibrium state.
6
Easy
6 of 331
Understanding
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Grinding of a living tissue in trichloroacetic acid shows the presence of the inorganic compounds like sulphate, phosphate etc, which are categorised in
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Correct option: B
Acid soluble fraction
Option B (Acid soluble fraction) is correct because inorganic compounds are generally smaller and dissolve in the acid solution.
7
Medium
7 of 331
Remembering
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Pathways in which complex compounds are converted to simple compounds by the release of energy are
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Correct option: B
Catabolic pathways
Option B (Catabolic pathways) is correct because catabolic pathways involve the breakdown of complex molecules into simpler ones, releasing energy in the process.
8
Hard
8 of 331
Remembering
+4 | -1
Most abundant homopolymeric biomolecule in biosphere is
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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.
9
Medium
9 of 331
Understanding
+4 | -1
No. of peptides bonds present in a polypeptide with ten amino acids is
View answer and explanation
Correct option: D
9
Option D (9) is correct because the number of peptide bonds in a polypeptide is always one less than the number of amino acids.
10
Easy
10 of 331
Remembering
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Which of the following is an essential amino acids?
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Correct option: D
All of these
Option D is correct because Valine, Leucine, and Tryptophan are all essential amino acids.
11
Medium
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Understanding
+4 | -1
Following are the statements with reference to ‘lipids’.
a) Lipids having only single bonds are called unsaturated fatty acids
b) Lecithin is a phospholipid.
c) Trihydroxy propane is glycerol.
d) Palmitic acid has 20 carbon atoms including carboxyl carbon.
e) Arachidonic acid has 16 carbon atoms.
Choose the correct answer from the options given below.
a) Lipids having only single bonds are called unsaturated fatty acids
b) Lecithin is a phospholipid.
c) Trihydroxy propane is glycerol.
d) Palmitic acid has 20 carbon atoms including carboxyl carbon.
e) Arachidonic acid has 16 carbon atoms.
Choose the correct answer from the options given below.
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Correct option: A
(b) and (c) only
The correct answer is A because lecithin is a phospholipid and trihydroxy propane is glycerol. The other statements are incorrect regarding the number of bonds and carbon atoms.
12
Easy
12 of 331
Understanding
+4 | -1
A fatty acid has a carboxyl group attached to R group. The R group could be a
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because the R group in a fatty acid can be a methyl, ethyl, or a higher number of groups.
13
Medium
13 of 331
Understanding
+4 | -1
Select the wrong statement.
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Correct option: A
The building blocks of lipids are amino acids
Option A (The building blocks of lipids are amino acids) is correct because the building blocks of lipids are fatty acids and glycerol, not amino acids.
14
Easy
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Analyzing
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On comparing the proportion of elements found in human tissue and Earth’s crust, which one of the following is found to be negligible?
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Correct option: A
Silicon
Option A (Silicon) is correct because the proportion of silicon is much higher in the Earth's crust compared to human tissue.
15
Medium
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Remembering
+4 | -1
After doing the chemical analysis of organic compounds found in living organisms, two fractions were observed namely
View answer and explanation
Correct option: A
Acid soluble pool and acid insoluble pool
Option A (Acid soluble pool and acid insoluble pool) is correct because chemical analysis of organic compounds yields two fractions based on solubility in acid.
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16
Easy
16 of 331
Remembering
+4 | -1
Name the four elements called ‘Big-four’ which make up 95% of all elements found in a living system
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Correct option: B
C, H, O, N
Option B (C, H, O, N) is correct because carbon, hydrogen, oxygen, and nitrogen are the most abundant elements in living systems, making up about 95% of their mass.
17
Medium
17 of 331
Remembering
+4 | -1
Which type of protein is present in human skin?
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Correct option: B
Secondary proteins
Option B (Secondary proteins) is correct because proteins in human skin, like collagen, exhibit secondary structures such as alpha-helices.
18
Medium
18 of 331
Remembering
+4 | -1
Which of the following play known roles in normal physiological processes?
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Correct option: D
Tryptophan
Option D (Tryptophan) is correct because tryptophan is an essential amino acid that plays a role in various physiological processes.
19
Medium
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Understanding
+4 | -1
Primary metabolites play known roles in
View answer and explanation
Correct option: D
Physiological process
Option D is correct because primary metabolites are directly involved in essential life processes.
20
Easy
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Understanding
+4 | -1
ATP differs from adenylic acid in
View answer and explanation
Correct option: A
Having 2 additional phosphate molecule
Option A (Having 2 additional phosphate molecule) is correct because ATP (Adenosine Triphosphate) has three phosphate groups, while adenylic acid (AMP - Adenosine Monophosphate) has only one.
21
Hard
21 of 331
Remembering
+4 | -1
Rubber, gums, cellulose are examples for?
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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.
22
Easy
22 of 331
Remembering
+4 | -1
Proteins with catalytic power are known as
View answer and explanation
Correct option: C
Enzymes
Option C (Enzymes) is correct because enzymes are proteins that catalyze biochemical reactions.
23
Medium
23 of 331
Understanding
+4 | -1
Identify the term ‘ash’ in term of living tissue sample analysis from the statements given below
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Correct option: B
The material left after burning the tissue which contains inorganic elements (e.g., calcium, magnesium etc.)
Option B (The material left after burning the tissue which contains inorganic elements (e.g., calcium, magnesium etc.)) is correct because ash is the residue remaining after burning organic matter, consisting of inorganic compounds.
24
Medium
24 of 331
Remembering
+4 | -1
Which of the following is a saturated fatty acid?
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Correct option: D
Palmitic acid
Option D (Palmitic acid) is correct because it is a saturated fatty acid, meaning it contains no carbon-carbon double bonds.
25
Easy
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Remembering
+4 | -1
Choose correct set of primary metabolites.
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Correct option: D
Tyrosine and chlorophyll
Option B (Glucose and cellulose) is correct because both are directly involved in essential metabolic processes and structural components in organisms.
26
Medium
26 of 331
Remembering
+4 | -1
Formation of lactic acid from glucose occurs in… metabolic steps
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Correct option: D
10
Option D (10) is correct because the conversion of glucose to lactic acid involves 10 enzymatic steps in glycolysis.
27
Hard
27 of 331
Remembering
+4 | -1
Enzymes isolated from organisms which line in extreme high temperatures show catalytic activity in a range of?
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Correct option: C
Option 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.
28
Easy
28 of 331
Understanding
+4 | -1
Acidic amino acids carry two -COOH and one groups per molecule. Keeping this in mind, select the correct pair of acidic amino acid
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Correct option: B
Aspartic acid and glutamic acid
Option B (Aspartic acid and glutamic acid) is correct because they are the two common amino acids with acidic side chains (containing an extra -COOH group).
29
Medium
29 of 331
Remembering
+4 | -1
Most abundant substance in living organisms
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Correct option: D
water
Option D (water) is correct because water is the most abundant substance in living organisms, essential for various biological processes.
30
Easy
30 of 331
Remembering
+4 | -1
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
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Correct option: C
Homeostasis
Option C (Homeostasis) is correct because homeostasis is the maintenance of a stable internal environment.
Revision notes and key takeaways
Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.
Key Takeaways
- ✓ This set contains 331 single-correct-answer MCQs on BIOMOLECULES.
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Showing 1-30 of 331 questions