NEET Biology Biomolecules MCQs Set 15

Download NEET MCQs for NEET Biology: Biomolecules

Access targeted multiple-choice questions for Biomolecules designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Chapter-wise Objective Questions: Biomolecules

View or download the dedicated Biomolecules MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Biology evaluations.

Multiple Choice Questions

Question 1: Biomolecules are extracted from living tissue by grinding it in
(a) distilled water
(b) ethyl alcohol only
(c) sodium chloride solution
(d) trichloroacetic acid
Show Answer & Explanation

Answer: (d) trichloroacetic acid

Explanation:
1. The tissue is ground in cold trichloroacetic acid, giving a slurry that is filtered into acid-soluble and acid-insoluble fractions.

Teacher's Note:
1. If a tissue is burnt, the ash gives inorganic elements.

Question 2: If a living tissue is completely burnt, the ash contains
(a) carbon compounds
(b) proteins
(c) lipids
(d) inorganic elements
Show Answer & Explanation

Answer: (d) inorganic elements

Explanation:
1. Carbon compounds are lost as gases, and the ash has minerals.

Teacher's Note:
1. Analysis of ash tells the inorganic composition.

Question 3: In an amino acid, the carbon that carries the amino group, carboxyl group and R group is called
(a) the beta carbon
(b) the alpha carbon
(c) the gamma carbon
(d) the delta carbon
Show Answer & Explanation

Answer: (b) the alpha carbon

Explanation:
1. Amino acids are substituted methanes with an amino group, carboxyl group, hydrogen and R group on the alpha carbon.

Teacher's Note:
1. R group defines the type of amino acid.

Question 4: Glutamic acid, valine and lysine are respectively
(a) acidic, neutral and basic amino acids
(b) basic, acidic and neutral amino acids
(c) neutral, basic and acidic amino acids
(d) acidic, basic and neutral amino acids
Show Answer & Explanation

Answer: (a) acidic, neutral and basic amino acids

Explanation:
1. Glutamic acid has an extra acidic carboxyl group, lysine an extra amino group and valine is neutral.

Teacher's Note:
1. There are 20 protein amino acids.

Question 5: A sulphur containing amino acid is
(a) serine
(b) valine
(c) lysine
(d) cysteine
Show Answer & Explanation

Answer: (d) cysteine

Explanation:
1. Cysteine and methionine contain sulphur.

Teacher's Note:
1. Both are protein amino acids.

Question 6: Palmitic acid has how many carbon atoms including the carboxyl carbon?
(a) 20
(b) 18
(c) 16
(d) 12
Show Answer & Explanation

Answer: (c) 16

Explanation:
1. Palmitic acid is CH3(CH2)14COOH.

Teacher's Note:
1. Arachidonic acid has 20 carbons.

Question 7: Glycerol is chemically
(a) dihydroxy ethane
(b) trihydroxy propane
(c) monohydroxy propane
(d) trihydroxy butane
Show Answer & Explanation

Answer: (b) trihydroxy propane

Explanation:
1. Glycerol is a simple lipid backbone with three hydroxyl groups.

Teacher's Note:
1. Fatty acids attach by ester bonds.

Question 8: Lipids are classified as fats or oils on the basis of their
(a) colour
(b) melting point
(c) molecular weight
(d) solubility
Show Answer & Explanation

Answer: (b) melting point

Explanation:
1. Oils have a lower melting point and remain liquid at room temperature.

Teacher's Note:
1. Gingelly oil has a low melting point.

Question 9: The lipid found in cell membranes is
(a) triglyceride
(b) phospholipid such as lecithin
(c) cholesterol only
(d) wax
Show Answer & Explanation

Answer: (b) phospholipid such as lecithin

Explanation:
1. Phospholipids have a polar head with phosphate and a nonpolar tail of fatty acids.

Teacher's Note:
1. Lecithin has a choline group.

Question 10: A nitrogenous base joined to a sugar is a
(a) nucleotide
(b) nucleoside
(c) polynucleotide
(d) nucleic acid
Show Answer & Explanation

Answer: (b) nucleoside

Explanation:
1. Nucleoside plus phosphate is a nucleotide.

Teacher's Note:
1. Adenosine and guanosine are nucleosides.

Question 11: A nitrogenous base plus sugar plus phosphate forms a
(a) nucleoside
(b) amino acid
(c) glycoside
(d) nucleotide
Show Answer & Explanation

Answer: (d) nucleotide

Explanation:
1. Nucleotides polymerise through phosphodiester bonds.

Teacher's Note:
1. Adenylic acid is a nucleotide.

Question 12: The bond between the nitrogenous base and the sugar in a nucleotide is
(a) an N-glycosidic bond
(b) an ester bond
(c) a peptide bond
(d) a hydrogen bond
Show Answer & Explanation

Answer: (a) an N-glycosidic bond

Explanation:
1. The ester bond joins phosphate to sugar.

Teacher's Note:
1. Phosphodiester bonds link nucleotides.

Question 13: Which pair is correctly matched?
(a) Guanylic acid: nucleoside
(b) Thymidine: nucleoside
(c) Cholesterol: nucleotide
(d) Glycine: lipid
Show Answer & Explanation

Answer: (b) Thymidine: nucleoside

Explanation:
1. Thymidine is a nucleoside, guanylic acid a nucleotide, cholesterol a lipid and glycine a simple amino acid.

Teacher's Note:
1. Ending -ylic acid denotes nucleotide.

Question 14: The molecular weight of biomicromolecules is approximately
(a) more than 10000 daltons
(b) less than 1000 daltons
(c) more than 1000 daltons
(d) more than 100000 daltons
Show Answer & Explanation

Answer: (b) less than 1000 daltons

Explanation:
1. Amino acids, sugars and nucleotides are micromolecules.

Teacher's Note:
1. Macromolecules are over 1000 daltons.

Question 15: Peptide bonds join amino acids, formed between
(a) the carboxyl group of one and the amino group of the next
(b) two amino groups
(c) two carboxyl groups
(d) two R groups
Show Answer & Explanation

Answer: (a) the carboxyl group of one and the amino group of the next

Explanation:
1. Condensation releases water.

Teacher's Note:
1. The amino acid with the free amino group is the N-terminal.

Question 16: The most abundant protein in the animal world and in the whole biosphere are respectively
(a) RuBisCO and collagen
(b) haemoglobin and collagen
(c) collagen and RuBisCO
(d) insulin and RuBisCO
Show Answer & Explanation

Answer: (c) collagen and RuBisCO

Explanation:
1. Collagen is most abundant in animals and RuBisCO in the biosphere.

Teacher's Note:
1. Collagen forms intercellular ground substance.

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Multiple Choice Questions (MCQs) for NEET Biology Biomolecules

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FAQs

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