Biomolecules MCQs For NEET | Most Important Questions For NEET 2026

Added: 2026-05-25

[00:00:01]Conversion of glucose to lactic acid in skeletal muscles is an example of Correct answer is B, catabolic pathway.

[00:00:16]Which molecule stores iodine inside helical structure?

[00:00:24]Correct answer is B, amylose.

[00:00:29]Which pathway involves breakdown of complex molecules into simpler ones?

[00:00:38]Correct answer is B, catabolic.

[00:00:43]In a protein chain, the first amino acid end is called Correct answer is B, N-terminal.

[00:00:56]The last amino acid end of a protein chain is called Correct answer is C, C-terminal.

[00:01:10]Removal of CO2 from amino acid converts it into Correct answer is B, amine.

[00:01:23]Adult human hemoglobin consists of Correct answer is B, two alpha and two beta subunits.

[00:01:36]A catalytically active enzyme along with its bound prosthetic group is called Correct answer is C, holoenzyme.

[00:01:51]The inactive protein part of an enzyme without cofactor is called A answer is B, a pinzyme.

[00:02:05]The N-terminal of a protein contains a free Correct answer is B, amino group.

[00:02:17]The C-terminal of a protein contains a free Correct answer is C, carboxyl group.

[00:02:31]Prosthetic groups are distinguished because they are Correct answer is B, tightly bound.

[00:02:43]Which statement about prosthetic groups is incorrect?

[00:02:50]Correct answer is C, they are loosely bound.

[00:02:56]In an enzyme energy profile diagram, the highest energy point represents Correct answer is C, transition state.

[00:03:12]The energy barrier reduced by enzymes is called Correct answer is B, activation energy.

[00:03:25]Which biomolecule changes structure at different pH due to zwitterion formation?

[00:03:34]Correct answer is B, amino acid.

[00:03:40]Catalytic efficiency of two different enzymes is commonly compared by Correct answer is A, optimum pH.

[00:03:54]The functional specificity of enzymes depends mainly on their Correct answer is B, 3D structure.

[00:04:08]The blue color with iodine is shown by Correct answer is B, starch.

[00:04:20]Why does cellulose not give blue color with iodine?

[00:04:27]Correct answer is B, it does not form helical structure.

[00:04:33]Cofactor free inactive enzyme is called Correct answer is B, up enzyme.

[00:04:46]Enzyme with cofactor attached is called Correct answer is B, holoenzyme.

[00:04:58]Which polysaccharide forms helical coils?

[00:05:05]Correct answer is C, starch.

[00:05:10]If enzyme shape is altered, it mainly affects Correct answer is B, catalytic function.

[00:05:23]The quaternary structure of proteins refers to Correct answer is C, assembly of more than one polypeptide subunit.

[00:05:38]Which statement about adult human hemoglobin is incorrect?

[00:05:46]Correct answer is C, It has six polypeptide subunits.

[00:05:53]Amino acids are classified mainly on the basis of Correct answer is C. Characteristics of side chain.

[00:06:07]Nitrogenous bases are chemically classified as Correct answer is C.

[00:06:17]Heterocyclic compounds.

[00:06:22]Assertion: Zinc is a cofactor for carboxypeptidase.

[00:06:26]Reason: Carboxypeptidase is a metalloenzyme.

[00:06:33]Correct answer is A. Both true and reason correctly explains assertion.

[00:06:41]Which level of protein structure is represented by hemoglobin?

[00:06:49]Correct answer is D. Quaternary.

[00:06:54]Structural changes in amino acids in solutions of different pH occur due to Correct answer is B. Ionization of amino and carboxyl groups.

[00:07:11]Which part of amino acid determines its unique chemical nature?

[00:07:19]Correct answer is D. R group.

[00:07:25]The protein part of holoenzyme is called Correct answer is C. Apoenzyme.

[00:07:37]Enzyme catalysis differs from inorganic catalysis because enzymes.

[00:07:46]Correct answer is B, work efficiently under mild conditions.

[00:07:53]Inorganic catalysts usually work efficiently at Correct answer is B, high temperature and high pressure.

[00:08:07]Immediately after substrate binds to active site, the next event is Correct answer is C, induced conformational change in enzyme.

[00:08:23]The enzyme substrate interaction finally leads to Correct answer is B, product release and free enzyme regeneration.

[00:08:38]An inhibitor that binds at a site other than active site and does not resemble substrate is Correct answer is B, non-competitive inhibitor.

[00:08:54]Competitive inhibitors generally Correct answer is C, closely resemble substrate.

[00:09:07]Which is a non-proteinaceous enzyme?

[00:09:14]Correct answer is C, ribozyme.

[00:09:19]Ribozymes are made of Correct answer is C, RNA.

[00:09:30]Ions constitute approximately what percentage of total cell mass?

[00:09:39]Correct answer is B, 1%.

[00:09:44]In cellulose, the non-reducing end is generally represented as Correct answer is B, left end.

[00:09:58]Low temperature preserves enzyme by Correct answer is B, keeping enzyme temporarily inactive.

[00:10:11]High temperature destroys enzyme activity because Correct answer is B, it causes protein denaturation.

[00:10:25]Which statement about enzyme temperature response is correct?

[00:10:33]Correct answer is C, high temperature can denature enzymes.

[00:10:41]If inhibitor closely resembles substrate in molecular structure, it is Correct answer is B, competitive inhibitor.

[00:10:55]Competitive inhibitor of succinate dehydrogenase is Correct answer is B, malonate.

[00:11:08]Long protein chain folded upon itself like a woolen ball forms Correct answer is C, tertiary structure.

[00:11:22]Which protein structure involves overall 3D folding of a single polypeptide?

[00:11:31]Correct answer is C, tertiary.

[00:11:37]Enzyme catalysts differ from inorganic catalysts because enzymes Correct answer is B, work under physiological conditions.

[00:11:52]Which inhibitor binds to active site?

[00:11:58]Correct answer is A, competitive inhibitor.

[00:12:05]Product release in enzyme catalysis occurs after Correct answer is B, bond breaking and product formation.

[00:12:19]Which of the following is false about non-competitive inhibition?

[00:12:27]Correct answer is B, inhibitor resembles substrate.

[00:12:33]Succinate dehydrogenase is inhibited competitively because malonate Correct answer is B, resembles succinate structurally.

[00:12:49]Temporary enzyme inactivation at low temperature is usually Correct answer is B, reversible.

[00:13:02]Which of the following is an example of catalytic RNA?

[00:13:10]Correct answer is B, ribozyme.

[00:13:15]The folded globular appearance of many proteins is due to Correct answer is B, tertiary interactions.