Biomolecules NEET 2026: Why B, C and E Are Correct

What does the Biomolecules NEET 2026 question ask?

Check all five statements before matching options in this Biomolecules NEET 2026 question. The chosen combination must include every correct claim and no incorrect one. This is the supplied NEET 2026 Biology question on Biomolecules, tagged medium on the question bank’s own scale.

Identify which of these five claims are scientifically correct:

• A: Lipids usually dissolve in water.
• B: Proteins are chains of amino-acid residues.
• C: Polysaccharides consist of extended chains of sugar units.
• D: Adenine and guanine belong to the pyrimidine family.
• E: Proteins account for nearly all enzymes.

Choose one complete combination:

1. B, D and E only.
2. B, C and E only.
3. A, B and C only.
4. C, D and E only.

Attempt it before reading further. The question bank gives 60 seconds as the expected solving time, not a compulsory limit or a measured student average.

Why is statement A false while statements B and C are true?

A fails because lipids are generally insoluble in water; B and C correctly identify the units that form proteins and polysaccharides. Follow the supplied solution’s statement-by-statement method before checking the answer combinations.

Step 1: A is false. Many lipids are predominantly nonpolar, so they interact poorly with polar water molecules. This accounts for their generally poor water solubility.

Do not stretch this into “every lipid behaves identically”. Some lipids contain polar regions, but that does not make the claim of usual water solubility correct.

Step 2: B is true. Proteins consist of one or more polypeptide chains. Each chain contains amino-acid residues joined by peptide bonds.

Step 3: C is true. Polysaccharides contain many monosaccharide units connected by glycosidic bonds. Glycogen contains glucose units arranged in branched chains, so “chain” does not necessarily mean unbranched.

The running verdicts are A false; B true; C true. Both polymer statements correctly identify their building units, but the bonds joining those units differ.

Why is the base statement false but the enzyme statement true?

D misclassifies adenine and guanine, which are substituted purines, not substituted pyrimidines. E is correct because “almost all” allows exceptions. Catalytic RNA is the relevant enzyme exception; it does not make the supplied claim false.

Step 4: D is false. Keep the base families separate:

• Purines: Adenine and guanine.
• Pyrimidines: Cytosine, thymine and uracil.

The structural memory check is ring number. Purines have two fused rings, whereas pyrimidines have one ring. Recognising a molecule as a nitrogenous base is not enough to identify its family.

Step 5: E is true. Almost all enzymes are proteins. The relevant exceptions are ribozymes, which are RNA molecules capable of catalysing reactions.

An exception disproves “all”, but it does not disprove “almost all”. Rejecting E because ribozymes exist would therefore ignore its qualifier. Check the exact claim, not a stronger claim that the statement does not make.

The remaining verdicts are D false; E true.

Which option matches the complete truth set?

The correct statements are B, C and E: option (2), labelled answer-choice B in the question bank. The completed sequence is A false; B true; C true; D false; E true. Match the options only after reaching these biological verdicts.

Keep the two uses of B separate:

• Statement B is the protein claim.
• Answer-choice B is the entire combination B, C and E.

Now audit the alternatives:

How could a reasoning mistake lead to option (1)?

Confusing purines with pyrimidines can lead to option (1) if you stop at a partly familiar combination. B and E are true, and adenine and guanine are nitrogenous bases. But recognising them as bases does not establish their family.

Option (1) also omits the true polysaccharide statement C. It therefore includes a false statement and leaves out a true one.

Use this method:

1. Assign true or false to all five claims.
2. Collect every true statement.
3. Confirm that the selected option includes each one and no false statement.

For a marking scheme with the correct-answer award and wrong-answer penalty shown below, changing this response from wrong to right gives:

That is a score difference, not an extra bonus.

Can you apply the same checks to three related questions?

Check water solubility, base families and enzyme exceptions independently before choosing an answer. These questions test the same distinctions as the supplied question. Attempt each one before reading its worked answer.

Original practice questions: not additional NEET PYQs

Which substance is generally insoluble in water?

Worked answer: (3), a triacylglycerol. Its largely nonpolar character makes interaction with water unfavourable. Glucose and sucrose have hydroxyl groups that interact with water; glycine has groups that can carry charges in water. This corrects statement A: lipids are generally water-insoluble, not generally water-soluble.

Which pair contains only pyrimidine bases?

Worked answer: (2), cytosine and thymine. Both belong to the single-ring pyrimidine family. Check every rejected pair:

• Pair (1): Adenine and guanine are both purines.
• Pair (3): Adenine is a purine; cytosine is a pyrimidine.
• Pair (4): Guanine is a purine; uracil is a pyrimidine.

Which claim about enzymes is correct?

Worked answer: (2). Ribozymes are catalytic RNA molecules, so “every enzyme” in choice (1) fails. Enzymes are not exclusively polysaccharides, and RNA is not a polypeptide.

Before moving on, rewrite the original false statements correctly: lipids are generally insoluble in water; adenine and guanine are substituted purines.

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