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31 Year NEET Previous Year Questions: Biomolecules - 2


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25 Questions MCQ Test Chemistry 31 Years NEET Chapterwise Solved Papers | 31 Year NEET Previous Year Questions: Biomolecules - 2

31 Year NEET Previous Year Questions: Biomolecules - 2 for NEET 2022 is part of Chemistry 31 Years NEET Chapterwise Solved Papers preparation. The 31 Year NEET Previous Year Questions: Biomolecules - 2 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Biomolecules - 2 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Biomolecules - 2 below.
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31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 1

On hydrolysis of starch, we finally get [1991]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 1

Manufacture - By hydrolysis of starch with
hot dil. mineral acids

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 2

The couplings between base units of DNA isthrough : [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 2

Structure of DNA - It consists of two
polynucleotide chains, each chain forms a
right handed helical spiral with ten bases in
one turn of the spiral. The two chains coil to
double helix and run in opposite direction
held together by hydrogen bonding.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 3

Enzymes take part in a reaction and         [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 3

Enzymes being biocatalyst can increase the
rate of a reaction upto 10 million times. Even
very small amount can accelerate a reaction.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 4

Chemically considering digestion is basically           [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 4

Basically digestion means hydrolysis.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 5

The α-D glucose and β-D glucose differ from eachother due to difference in carbon atom withrespect to its     [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 5

α -D glucose and β–D glucose are the
isomers which differ in the orientation
(configuration) of H and OH groups around
C1 atom.

 

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 6

Which of the following protein destroy theantigen when it enters in body cell?         [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 6

When antigens enter in to the body cells
and destroy them, then antibodies being
proteins are synthesised in the body and
combine with antigens and destroy these
antigens by forming inactive complexes.
Therefore antibodies protein destroy
antigens.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 7

In reference to biological role, Ca2+ ions areimportant in [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 7

The correct answer is option  B
Calcium ions (Ca2+) contribute to the physiology and biochemistry of organisms' cells. They play an important role in signal transduction pathways, where they act as a second messenger, in neurotransmitter release from neurons, in contraction of all muscle cell types, and in fertilization.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 8

Sucrose in water is dextro-rotatory, [α]D= + 66.4º.When boiled with dilute HCl, the solutionbecomes leavo-rotatory, [α]D= –20º. In thisprocess the sucrose molecule breaks into[1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 8

The hydrolysis of sucrose by boiling with
mineral acid or by enzyme invertase or
sucrase produces a mixture of equal
molecules of D(+) glucose and
D(–) Fructose.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 9

A reagent suitable for the determination of Nterminal residue of a peptide is [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 9

2, 4- Dinitroflurobenzene, also known as
Sanger's reagent, reacts with the H2N - group
of the peptide to from 2, 4- dinitrophenyl
(DNP) derivative of the peptide. The DNP
derivative of the peptide is hydrolysed to
give DNP derivative of the single amino acid

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 10

The reactions of (a) oxygen and (b) carbon monoxide with haeme (the prosthetic group of  haemoglobin) give

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 10

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 11

Identify an element amongst the following whichis responsible for oxidation of water to O2 in biological processes [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 11

 Water oxidation is catalyzed by a manganese-containing cofactor contained in photosystem II known as the oxygen-evolving complex. Manganese is an important cofactor, and calcium and chloride are also required for the reaction to occur.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 12

Which one of the following chemical units is certainly to be found in an enzyme? [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 12

Peptide bonds are present in enzyme

 

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 13

The number of molecules of ATP produced in thelipid metabolism of a molecule of palmitic acid is   [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 13

We know that in the lipid metabolism, when
palmitic acid is oxidised, then two carbon
fragments are removed sequentially to form
acetyl coenzyme. It enters the citric acid
cycle for production of 130 ATP.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 14

In DNA the complementary bases are         [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 14

In DNA, adenine faces thymine and guanine
faces cytosine.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 15

Glucose molecule reacts with 'X' number ofmolecules of phenylhydrazine to yield osazone.The value of 'X' is [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 15

We know that glucose reacts with one
molecule of phenyl hydrazine to give phenyl
hydrazone. When warmed with excess of
phenylhydrazine, the secondary alcoholic
group adjacent to the aldehyde group is
oxidised by another molecule of
phenylhydrazine to a ketonic group. With this
ketonic group, the third molecule of
phenylhydrazine condenses to glucosazone.
Therefore the value of X is 3

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 16

Which of the following is the sweetest sugar?   [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 16

Fructose is the sweetest sugar.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 17

In cells the net production of ATP moleculesgenerated from one glucose molecule is [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 17

Net total number of ATP molecules evolved
= 36 molecules.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 18

Which of the following is a steroid hormone? [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 18

Progesterone (Gestogens) is a steroid
hormone, which controls the development
and maintainance of pregnancy. Thryoxine
and Adrenaline are Amine hormones.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 19

The dominant cation in the blood plasma(extracellular fluid) is              [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 19

Na+, Cl and HCO3 are the electrolytes
present in plasma solutes in blood. Na+ and
Cl helps in maintainence of osmotic
pressure and fluid balance.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 20

The number of essential amino acids in man is         

[2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 20

There are 20 amino acid in man out of which
10 amino acids are essential amino acids.
These essential amino acids are supplied to
our bodies by food which we take because
they cannot be synthesised in the body
.These are (i) valine (2) leucine (3) Isoleucine
(4) Phenyl alanine (5) Threonine (6)
Methionine (7) Lysine (8) Tryptho phone (9)
Arginine (10) Histidine.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 21

Mg is present in which of the following :          [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 21

Chlorophyll contain Mg.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 22

Which of the following gives positive Fehlingsolution test ?    [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 22

Glucose contain aldehyde group. Hence it
give positive fehling solution test.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 23

For   (peptide bond)

Which statement is incorrect about peptide bond?            [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 23

Due to resonance C — N bond in protein
acquires double bond character and is
smaller than usual C — N bond.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 24

Which is correct statement? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 24

Starch is also know as amylum which occurs
in all green plants. A molecule of starch
(C6H10O5 )n is built of a large number of
α-glucose ring joined through oxygen-atom.

31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 25

Which of the following is correct about Hbondingin nucleotide? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 2 - Question 25

The hydrogen bonds are formed between
the base (shown by dotted lines). Because
of size and geometrics of the bases, the only
possible pairing in DNA and between
G(Guanine) and C(Cytosine) through three
H-bonds and between A (Adenosine) and T
(Thymine) through two H-bonds.

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