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
Q. Biurest test is not given by :-
(1) proteins (2) carbohydrates (3) polypeptides (4) urea
AIEEE-2010
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
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
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
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
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
The pI (isoelectric point) of aspartic acid is :
(1) 1.88 (2) 2.77 (3) 3.65 (4) 5.74
JEE-Main(Online) – 2016
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
Q. Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution ?
JEE-Main 2017
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
Aspartic Acid Question is wrong. Please Correct.
Tubailhai
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
Really helpful
useful!
Last third question[JEE-Main(Online)-2016] answer is 2nd option not 4th
clear explanation for the anrs
need some more bits on this chapter
Its better to give explanation to every answer
Pls check and note answers
Nice notes
❤
It is better to give explanation of answer.
Good
Rhumanns purple used to detect proteins,not starch.
Please don’t play with students life idiots.
arre itna gussa mat karo bhaiya
Perfectly balanced, like all things should be