2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th January Evening Slot
The correct statement (s) among I to III with respect to potassium ions that are abundant within the cell fluid
is /are
I. They activate many enzymes
II. They participate in the oxidation of glucose to produce ATP
III. Along with sodium ions they are responsible for the transmission of nerve signals
I. They activate many enzymes
II. They participate in the oxidation of glucose to produce ATP
III. Along with sodium ions they are responsible for the transmission of nerve signals
A.
III only
B.
I and II only
C.
I and III only
D.
I, II and III only
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th January Morning Slot
Among the following compounds most basic amino acid is -
A.
Lysine
B.
Asparagine
C.
Histidine
D.
Serine
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 11th January Evening Slot
The correct match between Item I and Item II is :
| Item I | Item II | ||
|---|---|---|---|
| (A) | Ester test | (P) | Tyr |
| (B) | Carbylamine test | (Q) | Asp |
| (C) | Phthalein dye test |
(R) | Ser |
| (S) | Lys | ||
A.
(A)$ \to $(Q); (B)$ \to $(S); (C)$ \to $(P)
B.
(A)$ \to $(R); (B)$ \to $(S); (C)$ \to $(Q)
C.
(A)$ \to $(R); (B)$ \to $(Q); (C)$ \to $(P)
D.
(A)$ \to $(Q); (B)$ \to $(S); (C)$ \to $(R)
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 11th January Morning Slot
Among the following compounds, which one is found in RNA ?
A.
B.
C.
D.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 10th January Evening Slot
Which of the following tests cannot be used for identifying amino acids?
A.
Ninhydrin test
B.
Barfoed test
C.
Xanthoproteic test
D.
Biuret test
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 10th January Morning Slot
The correct structure of product 'P' in the following reactions is :
A.
B.
C.
D.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 9th January Evening Slot
The correct sequence of amino acids present in the tripeptide given below is :
A.
Val - Ser - Thr
B.
Thr - Ser - Val
C.
Leu - Ser - Thr
D.
Thr - Ser - Leu
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 9th January Morning Slot
The increasing order of pka of the following amino acids in aqueous solution is :
Gly, Asp, Lys, Arg
Gly, Asp, Lys, Arg
A.
Asp < Gly < Arg < Lys
B.
Gly < Asp < Arg < Lys
C.
Asp < Gly < Lys < Arg
D.
Arg < Lys < Gly < Asp
2018
JEE Mains
MCQ
JEE Main 2018 (Online) 16th April Morning Slot
Among the following, the incorrect statement is :
A.
Maltose and lactose has 1, 4 - glycosidic linkage.
B.
Sucrose and amylose has 1, 2 - glycosidic linkage
C.
Cellulose and amylose has 1, 4 - glycosidic linkage.
D.
Lactose contains $\beta $-D-galactose and $\beta $-D-glucose.
2018
JEE Mains
MCQ
JEE Main 2018 (Offline)
Glucose on prolonged heating with HI gives
A.
6-iodohexanal
B.
n-Hexane
C.
1-Hexene
D.
Hexanoic acid
2018
JEE Mains
MCQ
JEE Main 2018 (Offline)
The predominant form of histamine present in human blood is (pKa, Histidine = 6.0)
A.
B.
C.
D.
2018
JEE Mains
MCQ
JEE Main 2018 (Online) 15th April Evening Slot
The dipeptide, Gln-Gly, on treatment with CH3COCl followed y aqueous work up gives :
A.
B.
C.
D.
2018
JEE Mains
MCQ
JEE Main 2018 (Online) 15th April Morning Slot
Which of the following is the correct structure of Adenosine?
A.
B.
C.
D.
2017
JEE Mains
MCQ
JEE Main 2017 (Online) 9th April Morning Slot
The incorrect statement among the following is :
A.
$\alpha $-D-glucose and $\beta $-D-glucose are anomers.
B.
$\alpha $-D-glucose and $\beta $-D-glucose are enantiomers.
C.
Cellulose is a straight chain polysaccharide made up of only $\beta $-D-glucose units.
D.
The penta acetate of glucose does not react with hydroxyl amine
2017
JEE Mains
MCQ
JEE Main 2017 (Online) 8th April Morning Slot
Among the following, the essential amino acid is :
A.
Alanine
B.
Valine
C.
Aspartic acid
D.
Serine
2017
JEE Mains
MCQ
JEE Main 2017 (Offline)
Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution?
A.
B.
C.
D.
2016
JEE Mains
MCQ
JEE Main 2016 (Online) 10th April Morning Slot
Observation of “Rhumann’s purple” is a confirmatory test for the presence of :
A.
Reducing sugar
B.
Cupric ion
C.
Protein
D.
Starch
2016
JEE Mains
MCQ
JEE Main 2016 (Online) 9th April Morning Slot
Consider the following sequence for aspartic acid :
The pI (isoelectric point) of aspartic acid is :
The pI (isoelectric point) of aspartic acid is :
A.
1.88
B.
3.65
C.
5.74
D.
2.77
2016
JEE Mains
MCQ
JEE Main 2016 (Offline)
Thiol group is present in :
A.
Cytosine
B.
Cystine
C.
Cysteine
D.
Methionine
2015
JEE Mains
MCQ
JEE Main 2015 (Offline)
Which of the vitamins given below is water soluble?
A.
Vitamin D
B.
Vitamin E
C.
Vitamin K
D.
Vitamin C
2014
JEE Mains
MCQ
JEE Main 2014 (Offline)
Which one of the following bases is not present in DNA?
A.
Cytosine
B.
Thymine
C.
Quinoline
D.
Adenine
2013
JEE Mains
MCQ
JEE Main 2013 (Offline)
Synthesis of each molecule of glucose in photosynthesis involves:
A.
10 molecules of ATP
B.
8 molecules of ATP
C.
6 molecules of ATP
D.
18 molecules of ATP
2012
JEE Mains
MCQ
AIEEE 2012
Which of the following compounds can be detected by Molisch’s test ?
A.
Nitro compounds
B.
Sugars
C.
Amines
D.
Primary alcohols
2012
JEE Mains
MCQ
AIEEE 2012
Which one of the following statements is correct ?
A.
All amino acids except lysine are optically active
B.
All amino acids are optically active
C.
All amino acids except glycine are optically active
D.
All amino acids except glutamic acid are optically active
2011
JEE Mains
MCQ
AIEEE 2011
The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA ?
A.
2nd
B.
3rd
C.
4th
D.
1st
2010
JEE Mains
MCQ
AIEEE 2010
Biuret test is not given by
A.
carbohydrates
B.
polypeptides
C.
urea
D.
proteins
2009
JEE Mains
MCQ
AIEEE 2009
The two functional groups present in a typical carbohydrate are
A.
-OH and -COOH
B.
-CHO and -COOH
C.
> C = O and - OH
D.
- OH and -CHO
2008
JEE Mains
MCQ
AIEEE 2008
$\alpha$-D-(+)-glucose and $\beta$-D-(+)-glucose are
A.
conformers
B.
epimers
C.
anomers
D.
enantiomers
2007
JEE Mains
MCQ
AIEEE 2007
The secondary structure of a protein refers to
A.
$\alpha$-helical backbone
B.
hydrophobic interactions
C.
sequence of $\alpha$-amino acids
D.
fixed configuration of the polypeptide backbone
2006
JEE Mains
MCQ
AIEEE 2006
The term anomers of glucose refers to
A.
isomers of glucose that differ in configurations at carbons one and four (C-1 and C-4)
B.
a mixture of (D)-glucose and (L)-glucose
C.
enantiomers of glucose
D.
isomers of glucose that differ in configuration at carbon one (C-1)
2006
JEE Mains
MCQ
AIEEE 2006
The pyrimidine bases present in DNA are
A.
cytosine and adenine
B.
cytosine and guanine
C.
cytosine and thymine
D.
cytosine and uracil
2005
JEE Mains
MCQ
AIEEE 2005
In both DNA and RNA, heterocyclic base and phosphate ester linkages are at-
A.
$C_5^{'}$ and $C_2^{'}$ respectively of the sugar molecule
B.
$C_2^{'}$ and $C_5^{'}$ respectively of the sugar molecule
C.
$C_1^{'}$ and $C_5^{'}$ respectively of the sugar molecule
D.
$C_5^{'}$ and $C_1^{'}$ respectively of the sugar molecule
2004
JEE Mains
MCQ
AIEEE 2004
Identify the correct statements regarding enzymes
A.
Enzymes are specific biological catalysts that can normally function at very high
temperature (T ~ 1000 K)
B.
Enzymes are specific biological catalysts that the posses well – defined active sites
C.
Enzymes are specific biological catalysts that can not be poisoned
D.
Enzymes are normally heterogeneous catalysts that are very specific in their action
2004
JEE Mains
MCQ
AIEEE 2004
Which base is present in RNA but not in DNA?
A.
Uracil
B.
Thymine
C.
Guanine
D.
Cytosine
2004
JEE Mains
MCQ
AIEEE 2004
Insulin production and its action in human body are responsible for the level of diabetes. This
compound belongs to which of the following categories?
A.
A co- enzyme
B.
An antibiotic
C.
An enzyme
D.
A hormone
2003
JEE Mains
MCQ
AIEEE 2003
The reason for double helical structure of $DNA$ is operation of
A.
dipole-dipole interaction
B.
hydrogen bonding
C.
electrostatic attractions
D.
van der Waals' forces
2003
JEE Mains
MCQ
AIEEE 2003
Complete hydrolysis of cellulose gives
A.
D-ribose
B.
D-glucose
C.
L-glucose
D.
D-fructose
2002
JEE Mains
MCQ
AIEEE 2002
The functional group, which is found in amino acid is
A.
-COOH group
B.
-NH2 group
C.
-CH3 group
D.
both (a) and (b)
2002
JEE Mains
MCQ
AIEEE 2002
RNA is different from DNA because RNA contains
A.
ribose sugar and thymine
B.
ribose sugar and uracil
C.
deoxyribose sugar and thymine
D.
deoxyribose sugar and uracil