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NEET Previous Year Chemistry Questions Chapter Biomolecules

1. Sucrose on hydrolysis gives                                          (NEET 2020)

(a) β-D-glucose + αD-fructose

(b) αD-glucose + β-D-glucose

(c) αD-glucose + β-D-fructose

(d) αD-fructose + β-D-fructose

2. The difference between amylose and amylopectin is               (NEET 2018)

(a) amylopectin have 1 → 4 α-linkage and 1 → 6 α-linkage

(b) amylose have 1 → 4 α-linkage and 1 → 6 β-linkage

(c)amylopectin have 1 → 4 α-linkage and 1 → 6 β-linkage

(d)amylose is made up of glucose and galactose.


              (NEET 2016)

(a) L-erythrose, L-threose, L-erythrose, D-threose

(b) D-threose, D-erythrose, L-threose, L-erythrose

(c) L-erythrose, L-threose, D-erythrose, D-threose

(d) D-erythrose, D-threose, L-erythrose, L-threose.

4. Which one given below is a non-reducing sugar?                   (NEET 2016)

(a) Glucose       (b) Sucrose

(c) Maltose       (d) Lactose

5. D (+)-glucose reacts with hydroxyl amine and yields an oxime. The
structure of the oxime would be                                                                      (NEET 2014)

(a)                     (b)

(c)                      (d)

6. Which one of the following sets of monosaccharides forms sucrose? (2012)

(a) αD-galactopyranose and αD-glucopyranose

(b) αD-glucopyranose and β-D-fructofuranose

(c) β-D-glucopyranose and αD-fructofuranose

(d) αD-glucopyranose and β-D-fructopyranose

7. Which one of the following statements is not true regarding (+)–lactose? (2011)

(a) On hydrolysis (+)–lactose gives equal amount of D (+)–glucose and D (+)–galactose.

(b) (+)–Lactose is a b-glucoside formed by the union of a molecule of D (+) –       glucose and a Molecule of D(+)–galactose.

(c) (+)–Lactose is a reducing sugar and does not exhibit mutarotation.

(d) (+)–Lactose, C12H22O11 contains 8 – OH groups.

8. Which one of the following does not exhibit the phenomenon of mutarotation? (2010)

(a) (+)–Sucrose                     (b) (+)–Lactose

(c) (+)–Maltose                     (d) (–)–Fructose

9. Fructose reduces Tollens’ reagent due to                                           (2010)

(a) Asymmetric carbons

(b) Primary alcoholic group

(c) Secondary alcoholic group

(d) Enolisation of fructose followed by conversion to aldehyde by base.

10. Number of chiral carbons in β-D-(+) glucose is                               (2004)

(a) Five       (b) six

(c) Three     (d) four.

11. Glycolysis is                                                                          (2003)

(a) Oxidation of glucose to glutamate

(b) Conversion of pyruvate to citrate

(c) Oxidation of glucose to pyruvate

(d) Conversion of glucose to haem.

21. Which of the following is a basic amino acid?                       (NEET2020)

(a) Serine              (b) Alanine

(c) Tyrosine          (d) Lysine

22. The non-essential amino acid among the following is           (NEET2019)

(a) Lysine                 (b) valine

(c) Leucine               (d) alanine.

23. Which structure(s) of proteins remain(s) intact during denaturation process? (NEET2019)

(a) Both secondary and tertiary structures

(b) Primary structure only

(c) Secondary structure only

(d) Tertiary structure only

24. Which of the following compounds can form a zwitter ion?           (NEET2018)

(a) Aniline         (b) Acetanilide

(c) Benzoic acid      (d) Glycine

24. Which of the following compounds can form a zwitter ion?           (NEET2018)

(a) Aniline               (b) Acetanilide

(c) Benzoic acid      (d) Glycine

25. In a protein molecule various amino acids are linked together by (NEET2016)

(a) Peptide bond

(b) Dative bond

(c) a-glyosidic bond

(d) b-glyosidic bond. `

26. Which of the statements about “Denaturation” given below are correct? (2011)

(1) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.

(2) Denaturation leads to the conversion of double strand of DNA into single strand.

(3) Denaturation affects primary structure which gets distorted.

(a) (2) and (3)          (b) (1) and (3)

(c) (1) and (2)          (d) (1), (2) and (3)

27. Which functional group participates in disulphide bond formation in proteins?


(a) Thioester         (b) Thioester

(c) Thiol               (d) Thiolactone

29. The correct statement in respect of protein hemoglobin is that it (2004)

(a) Functions as a catalyst for biological reactions

(b) Maintains blood sugar level

(c) Acts as an oxygen carrier in the blood

(d) Forms antibodies and offers resistance to diseases.

30. The helical structure of protein is stabilized by                      (2004)

(a) Dipeptide bonds    (b) hydrogen bonds

(c) Ether bonds          (d) peptide bonds.

31. Which is not true statement?                                        (2001)

(a) a-Carbon of a -amino acid is asymmetric.

(b) All proteins are found in L-form.

(c) Human body can synthesise all proteins they. Need.

(d) At pH = 7 both amino and carboxylic groups exist in ionized form.