Biomolecule - JEE Main Previous Year Questions with Solutions

eSaral › JEE › JEE Main ›Biomolecule - JEE Main Previous Year Questions with Solutions

🚀 Checkout eSaral Courses

Simulator   Previous Years AIEEE/JEE Main Questions [esquestion] The two functional groups present in a typical carbohydrate are :- (1) >C = O and –OH (2) –OH and –CHO (3) –OH and –COOH (4) –CHO and –COOH #tag# AIEEE-2009 #sol# (2) [/esquestion] [esquestion] Biurest test is not given by :- (1) proteins (2) carbohydrates (3) polypeptides (4) urea #tag# AIEEE-2010 #sol# (2) [/esquestion] [esquestion] The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA? (1) 3rd (2) 4th (3) 1st (4) 2nd #tag# AIEEE-2011 #sol# (4) [/esquestion] [esquestion] The change in the optical rotation of freshly prepared solution of glucose is known as :- (1) tautomerism (2) racemisation (3) specific rotation (4) mutarotation #tag# AIEEE-2011 #sol# (4) [/esquestion] [esquestion] Which one of the following statements is correct ? (1) All amino acids except glutamic acid are optically active (2) All amino acids except lysine are optically active (3) All amino acids are optically active (4) All amino acids except glycine are optically active #tag# AIEEE-2012 #sol# (4) [/esquestion] [esquestion] Synthesis of each molecule of glucose in photosynthesis involves :- (1) 18 molecules of ATP (2) 10 molecules of ATP (3) 8 molecules of ATP (4) 6 molecules of ATP #tag# JEE Main -2013 #sol# (1) Six rounds of the Calvin cycle are required, because one carbon atom is reduced in each round. Twelve molecules of ATP are expended. An additional six molecular of ATP are spent in regenerating ribulose-1, 5-biphosphate $6 \mathrm{CO}_{2}+18 \mathrm{ATP}+12 \mathrm{NADPH}+12 \mathrm{H}_{2} \mathrm{O} \rightarrow$ $\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+18 \mathrm{ADP}+18 \mathrm{P}_{\mathrm{i}}+12 \mathrm{NADP}+6 \mathrm{H} \oplus$ Reference : NCERT 11th class chapter-13 (Photosynthesis Pg. 217, 218 in higher plants. Calvin cycle where sugar is synthesised is as follows : The Calvin cycle proceeds in three stages (1) carboxylation, during which $\mathrm{CO}_{2}$ combines with ribulose-1.5-bisphosphate (2) reduction, during which carbohydrate is formed at the expense of the photochemically made ATP and NADPH and (3) regeneration during which the $\mathrm{CO}_{2}$ acceptor ribulose-1,5-bisphosphate is formed again so that the cylcle continues. It might help you to understand all of this if we look at what goes in and what comes out of the Calvin cycle. [/esquestion] [esquestion] Which one of the following bases is not present in DNA ? (1) Cytosine (2) Thymine (3) Quinoline (4) Adenine #tag# JEE-Main 2014 #sol# (3) All cytosine, thymine and adenine are present in DNA. Only quinoline is not present in DNA. [/esquestion] [esquestion] Which of the vitamins given below is water soluble? (1) Vitamin E (2) Vitamin K (3) Vitamin C (4) Vitamin D #tag# JEE-Main 2015 #sol# (3) Vitamine C is soluble in water due to H-Bonding & all other vitamines given in question are fat soluble. [/esquestion] [esquestion] Complete hydrolysis of starch gives : (1) glucose and fructose in equimolar amounts (2) glucose only (3) galactose and fructose in equimolar amounts (4) glucose and galactose in equimolar amounts #tag# JEE-Main(Online) - 2015 #sol# (2) Starch is polymer of Glucose [/esquestion] [esquestion] Accumulation of which of the following molecules in the muscles occurs as a result of vigorous exercise :- (1) Pyruvic acid (2) L-lactic acid (3) Glycogen (4) Glucose #tag# JEE-Main(Online) - 2015 #sol# (2) [/esquestion] [esquestion] Consider the following sequence for aspartic acid: The pI (isoelectric point) of aspartic acid is : (1) 1.88 (2) 2.77 (3) 3.65 (4) 5.74 #tag# JEE-Main(Online) - 2016 #sol# (4) [/esquestion] [esquestion] Observation of "Rhumann's purple" is a confirmatory test for the presence of : (1) Starch (2) Reducing sugar (3) Cupric ion (4) Protein #tag# JEE-Main(Online) - 2017 #sol# (1) [/esquestion] [esquestion] Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution ? #tag# JEE-Main 2017 #sol# (1) (1) Ester in presence of Aqueous KOH solution give SNAE reaction so following reaction takes place [/esquestion]

For Biomolecules and other Chemistry chapters, the JEE Mains PYQ chapter wise page provides organised chapter-wise practice.

Every reaction described here starts from the same molecule — see the structure of glucose page for exactly what that looks like.

After Biomolecules, test yourself on a full-length paper. Our JEE Main previous year question paper covers every recent session, free to attempt.