Biomolecule – JEE Main Previous Year Questions with Solutions
JEE Main Previous Year Papers Questions of Chemistry with Solutions are available at eSaral. Practicing JEE Mains chapter wise questions of Chemistry will help the JEE aspirants in realizing the question pattern as well as help in analyzing weak & strong areas. Simulator   Previous Years AIEEE/JEE Main Questions
Q. 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 AIEEE-2009

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Sol. (2)

Q. Biurest test is not given by :- (1) proteins (2) carbohydrates (3) polypeptides (4) urea AIEEE-2010

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Sol. (2)

Q. 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 AIEEE-2011

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Sol. (4)

Q. The change in the optical rotation of freshly prepared solution of glucose is known as :- (1) tautomerism (2) racemisation (3) specific rotation (4) mutarotation AIEEE-2011

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Sol. (4)

Q. 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 AIEEE-2012

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Sol. (4)

Q. 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 JEE Main -2013

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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.

Q. Which one of the following bases is not present in DNA ? (1) Cytosine (2) Thymine (3) Quinoline (4) Adenine JEE-Main 2014

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Sol. (3) All cytosine, thymine and adenine are present in DNA. Only quinoline is not present in DNA.

Q. Which of the vitamins given below is water soluble? (1) Vitamin E (2) Vitamin K (3) Vitamin C (4) Vitamin D JEE-Main 2015

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Sol. (3) Vitamine C is soluble in water due to H-Bonding & all other vitamines given in question are fat soluble.

Q. 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 JEE-Main(Online) – 2015

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Sol. (2) Starch is polymer of Glucose

Q. 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 JEE-Main(Online) – 2015

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Sol. (2)

Q. 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 JEE-Main(Online) – 2016

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Sol. (4)

Q. Observation of “Rhumann’s purple” is a confirmatory test for the presence of : (1) Starch (2) Reducing sugar (3) Cupric ion (4) Protein JEE-Main(Online) – 2017

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Sol. (1)

Q. Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution ? JEE-Main 2017

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Sol. (1) (1) Ester in presence of Aqueous KOH solution give SNAE reaction so following reaction takes place

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Comments
  • H
    February 28, 2021 at 5:08 pm

    there are 2 mistakes in the key please check properly while uploading.

    ‘Rhumann’s purple’ is a confirmatory test for the presence of: proteins not starch.

    consider the following sequence for asparic acid: 2.77 not 5.74

    22
  • January 22, 2021 at 2:50 am

    Really helpful

    5
  • December 29, 2020 at 11:16 am

    useful!

    2
  • October 17, 2020 at 7:06 am

    Last third question[JEE-Main(Online)-2016] answer is 2nd option not 4th

    3
  • September 2, 2020 at 5:22 pm

    clear explanation for the anrs

    5
  • September 2, 2020 at 5:20 pm

    need some more bits on this chapter

    2
  • August 26, 2020 at 12:54 pm

    Its better to give explanation to every answer

    7
  • August 18, 2020 at 3:15 pm

    Pls check and note answers

    0
  • August 12, 2020 at 8:10 am

    Nice notes

    0
  • August 9, 2020 at 7:42 pm

    6
  • August 4, 2020 at 9:25 am

    It is better to give explanation of answer.

    11
  • August 2, 2020 at 2:22 pm

    Good

    1
  • June 22, 2020 at 10:25 am

    Rhumanns purple used to detect proteins,not starch.
    Please don’t play with students life idiots.

    7
    • March 10, 2021 at 1:57 am

      arre itna gussa mat karo bhaiya

      2
    • March 10, 2021 at 1:58 am

      Perfectly balanced, like all things should be

      1
    • March 10, 2021 at 1:59 am

      beta aise shabdo ka prayog mat karo

      1