Practice Test Sets (Total Questions: 100)

Topic Practice: Biomolecules (Test - 1)

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About Biomolecules MCQ

Ace Biomolecules for NEET UG with essential practice MCQs, enzyme kinetics, structural diagrams, and NCERT-based notes on proteins, carbohydrates, lipids, an…

This Biomolecules MCQ practice set is designed for students preparing for school exams and competitive exams. It contains 100 multiple choice questions divided into 2 test sets of up to 50 questions each. Every question has four options, and after answering you can see the correct option, a detailed explanation and how other users answered.

biomolecules NEET MCQs carbohydrates proteins lipids nucleic acids enzymes catalysis NEET questions metabolism biochemicals NEET biology notes

Sample Biomolecules Questions

When a living tissue (such as a plant leaf) is ground in trichloroacetic acid (Cl3CCOOH) using a mortar and pestle and strained through cheesecloth, two fractions are obtained. Which of the following statements correctly describes these fractions?
- A. The filtrate contains the acid-insoluble fraction consisting of micromolecules with molecular weights ranging from 18 to 800 Daltons.
- B. The retentate contains the acid-soluble pool comprising biomacromolecules with molecular weights greater than 10,000 Daltons.
- C. The acid-soluble pool represents the cytoplasmic composition containing molecules with molecular weights of 18 to 800 Daltons approx.
- D. Lipids are present in the acid-soluble pool because their molecular weight is strictly less than 800 Daltons.
Given below are two statements regarding elemental analysis of living tissue: Statement I: Ash analysis is performed by fully burning living tissue to oxidize all carbon compounds to gaseous forms (CO2, water vapour). Statement II: Inorganic elements like calcium, magnesium, sodium, potassium, and phosphate are found in the acid-insoluble fraction (retentate). In light of the above statements, choose the correct answer:
- A. Both Statement I and Statement II are correct
- B. Both Statement I and Statement II are incorrect
- C. Statement I is correct but Statement II is incorrect
- D. Statement I is incorrect but Statement II is correct
Assertion (A): Lipids, despite having molecular weights not exceeding 800 Daltons, are isolated in the acid-insoluble macromolecular fraction. Reason (R): Lipids form cell membranes and vesicles which break into water-insoluble fragments and pass into the retentate during grinding with trichloroacetic acid. In light of the above statements, choose the correct answer:
- A. Both (A) and (R) are true and (R) is the correct explanation of (A)
- B. Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
- C. (A) is true but (R) is false
- D. (A) is false but (R) is true
Which of the following qualitative chemical tests is INCORRECTLY matched with its reagent and structural basis of color change?
- A. Iodine Test - Forms helical secondary structure complex with amylose in starch giving deep blue-black color
- B. Benedict's Test - Reducing sugars reduce cupric ions (Cu2+) to cuprous oxide (Cu2O) precipitate
- C. Biuret Test - Reacts specifically with individual free amino acids to give a violet color
- D. Xanthoproteic Test - Concentrated nitric acid reacts with aromatic amino acids (tyrosine, tryptophan) to yield yellow color
Statement I: Fehling's test involves reduction of Fehling's solution A (aqueous copper sulphate) and Fehling's solution B (alkaline sodium potassium tartrate / Rochelle salt) by reducing sugars. Statement II: Sucrose gives a positive brick-red precipitate with Fehling's reagent directly without prior acid hydrolysis. Choose the correct option:
- A. Both Statement I and Statement II are correct
- B. Both Statement I and Statement II are incorrect
- C. Statement I is correct but Statement II is incorrect
- D. Statement I is incorrect but Statement II is correct

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This page has 50 questions in Test - 1 out of 100 total questions on Biomolecules.

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Yes. After you select an option, the correct answer is shown along with an explanation and the percentage of users who chose each option.

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