NEET (UG)

Practice Test 1 — Biomolecules

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct & Statement-based)

Question 1

Which of the following is a non-reducing sugar?

Solution: Sucrose has no free anomeric group.

Question 2

Cellulose differs from starch in having:

Solution: $\beta$-links make cellulose indigestible to humans.

Question 3

The bond between two amino acids is a/an:

Solution: Peptide (amide) bond.

Question 4

Statements: (I) Denaturation destroys the primary structure of a protein. (II) Boiling an egg denatures its protein. Which is/are correct?

Solution: II correct; I wrong — denaturation spares the primary structure.

Question 5

In DNA, guanine pairs with cytosine through:

Solution: G–C = 3 hydrogen bonds.

Question 6

A nucleotide contains base, sugar and:

Solution: Base + sugar + phosphate.

Question 7

The deficiency disease caused by lack of vitamin A is:

Solution: Vitamin A deficiency → night blindness.

Question 8

Which hormone regulates blood glucose?

Solution: Insulin lowers blood glucose.

Section B — Assertion & Reason

Question 9

A: Sucrose does not reduce Fehling's solution.
R: In sucrose the anomeric carbons of both monosaccharide units are involved in the glycosidic linkage.

Solution: With both anomeric carbons tied up there is no free reducing group — R explains A.

Question 10

A: Humans cannot digest cellulose.
R: Humans lack the enzyme needed to hydrolyse beta-glycosidic linkages.

Solution: The missing beta-link enzyme is exactly why cellulose is indigestible — R explains A.

Question 11

A: The alpha-helix is an example of the primary structure of a protein.
R: The primary structure is the sequence of amino acids in a polypeptide chain.

Solution: A is false — the alpha-helix is secondary structure; R correctly defines primary structure.

Question 12

A: In DNA, the G–C base pair is held more strongly than the A–T pair.
R: G–C pairs form three hydrogen bonds while A–T pairs form two.

Solution: More hydrogen bonds mean a stronger pair — R explains A.