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NEET • BIOLOGY • BIOMOLECULES
Biomolecules practice · Medium
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Understanding
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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.
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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.
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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.
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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.
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No. of peptides bonds present in a polypeptide with ten amino acids is
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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.
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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.
View answer and explanation
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.
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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.
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After doing the chemical analysis of organic compounds found in living organisms, two fractions were observed namely
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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.
9
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Remembering
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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.
10
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Remembering
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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.
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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.
12
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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.
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Remembering
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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.
14
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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.
15
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Remembering
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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.
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Every chemical (metabolic) reaction is a … reaction
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Correct option: C
Catalysed
Option C (Catalysed) is correct because almost all metabolic reactions are facilitated by enzymes, which act as biological catalysts.
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Analyzing
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How many of the given statements are correct?
A. Water is the most abundant chemical in the living organisms.
B. A protein is a heteropolymer and not a homopolymer.
C. In polysaccharide,left end is called reducing end & right end is called non-reducing end.
D. A nucleoside is the building block of nucleic acids, which consist of a heterocyclic compound, a
monosaccharide and a phosphate.
A. Water is the most abundant chemical in the living organisms.
B. A protein is a heteropolymer and not a homopolymer.
C. In polysaccharide,left end is called reducing end & right end is called non-reducing end.
D. A nucleoside is the building block of nucleic acids, which consist of a heterocyclic compound, a
monosaccharide and a phosphate.
View answer and explanation
Correct option: B
Two
Option B (Two) is correct. Statements A and B are correct. C is incorrect because it's the opposite, and D is wrong because a nucleoside doesn't have a phosphate.
18
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The acid soluble pool, roughly represents
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Correct option: B
Cytoplasmic composition of cell
Option B is correct because the acid-soluble pool contains the smaller molecules found in the cytoplasm.
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Amino acids are mostly synthesized from?
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Correct option: D
ketoglutaric acid
The correct answer is D because - ketoglutaric acid is a key intermediate in the Krebs cycle and is used in the synthesis of amino acids.
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In a protein molecule, the amino acid units are linked together by ……... bonds formed between the amino group and the carboxyl group of successive amino acids
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Correct option: A
Peptide
Option A (Peptide) is correct because peptide bonds are formed between the amino group of one amino acid and the carboxyl group of another.
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Pentoses and hexoses are common
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Correct option: A
Monosaccharides
Option A (Monosaccharides) is correct because pentoses (5-carbon sugars) and hexoses (6-carbon sugars) are both types of monosaccharides.
22
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The tertiary structure of the proteins containing amino acid cysteine is achieved through
View answer and explanation
Correct option: B
Disulphide bonds
Option B (Disulphide bonds) is correct because the tertiary structure of proteins containing cysteine is stabilized by disulphide bonds between cysteine residues.
23
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Select the incorrect match w.r.t secondary metabolites
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Correct option: C
Drugs- Curcumin, Concanavalin-A
Option C is correct because Concanavalin-A is a lectin, not a drug.
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Which of the following statements are correct for polysaccharides?
I. The polysaccharides are found as a part of the acid insoluble pellet
II. These are long chains of sugars
III. They are threads containing different monosaccharides as building blocks
IV. Cellulose is a polymeric polysaccharide consisting of only one type of monosaccharide i.e., fructose
I. The polysaccharides are found as a part of the acid insoluble pellet
II. These are long chains of sugars
III. They are threads containing different monosaccharides as building blocks
IV. Cellulose is a polymeric polysaccharide consisting of only one type of monosaccharide i.e., fructose
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Correct option: B
All are correct except IV
Option B is correct because cellulose is a polymer of glucose, not fructose.
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Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these
View answer and explanation
Correct option: D
Help in regulating metabolism
Option D (Help in regulating metabolism) is correct because enzymes, vitamins, and hormones all play crucial roles in regulating metabolic processes within the body.
26
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Remembering
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Protein uptake in nucleus occurs by
View answer and explanation
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.
27
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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.
28
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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).
29
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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.
30
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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.
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 142 single-correct-answer MCQs on BIOMOLECULES.
- ✓ Try each question before opening its answer. Read the explanation where one is available.
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Showing 1-30 of 142 questions