On hydrolysis of starch, we finally get 
Manufacture - By hydrolysis of starch with
hot dil. mineral acids
The couplings between base units of DNA isthrough : 
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.
Enzymes take part in a reaction and 
Enzymes being biocatalyst can increase the
rate of a reaction upto 10 million times. Even
very small amount can accelerate a reaction.
Chemically considering digestion is basically 
Basically digestion means hydrolysis.
The α-D glucose and β-D glucose differ from eachother due to difference in carbon atom withrespect to its 
α -D glucose and β–D glucose are the
isomers which differ in the orientation
(configuration) of H and OH groups around
Which of the following protein destroy theantigen when it enters in body cell? 
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
In reference to biological role, Ca2+ ions areimportant in 
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
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
A reagent suitable for the determination of Nterminal residue of a peptide is 
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
The reactions of (a) oxygen and (b) carbon monoxide with haeme (the prosthetic group of haemoglobin) give
Identify an element amongst the following whichis responsible for oxidation of water to O2 in biological processes 
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.
Which one of the following chemical units is certainly to be found in an enzyme? 
Peptide bonds are present in enzyme
The number of molecules of ATP produced in thelipid metabolism of a molecule of palmitic acid is 
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.
In DNA the complementary bases are 
In DNA, adenine faces thymine and guanine
Glucose molecule reacts with 'X' number ofmolecules of phenylhydrazine to yield osazone.The value of 'X' is 
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
Which of the following is the sweetest sugar? 
Fructose is the sweetest sugar.
In cells the net production of ATP moleculesgenerated from one glucose molecule is 
Net total number of ATP molecules evolved
= 36 molecules.
Which of the following is a steroid hormone? 
Progesterone (Gestogens) is a steroid
hormone, which controls the development
and maintainance of pregnancy. Thryoxine
and Adrenaline are Amine hormones.
The dominant cation in the blood plasma(extracellular fluid) is 
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.
The number of essential amino acids in man is
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.
Mg is present in which of the following : 
Chlorophyll contain Mg.
Which of the following gives positive Fehlingsolution test ? 
Glucose contain aldehyde group. Hence it
give positive fehling solution test.
For (peptide bond)
Which statement is incorrect about peptide bond? 
Due to resonance C — N bond in protein
acquires double bond character and is
smaller than usual C — N bond.
Which is correct statement? 
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.
Which of the following is correct about Hbondingin nucleotide? 
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.