Biology
Consider the following statements and choose the correct one
BiologyGeneral
Plant cells have centrioles which are absent in almost all animal cells
Ribosomes are the site of protein synthesis
The middle lamella is layer mainly of calcium carbonate which holds the different neighbouring cells together
In animal cells, steroidal hormones are synthesised by smooth endoplasmic reticulum
Plant cells have centrioles which are absent in almost all animal cells
Ribosomes are the site of protein synthesis
The middle lamella is layer mainly of calcium carbonate which holds the different neighbouring cells together
In animal cells, steroidal hormones are synthesised by smooth endoplasmic reticulum
Answer:The correct answer is: Ribosomes are the site of protein synthesis
In protoplasm, fat store in the form oftriglycerides. Polypeptides, polysaccharides and nucleoside are proteins, carbohydrates ad nucleic acid, respectively
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biology
The backbone of RNA consists of which of the following sugar?
Each spindle is a bipolar fibrous structure composed mainly of microtubules. The spindle fibres are mainly composed of tubulin protein.
The backbone of RNA consists of which of the following sugar?
biologyGeneral
Each spindle is a bipolar fibrous structure composed mainly of microtubules. The spindle fibres are mainly composed of tubulin protein.
biology
Identify A to F in the sectional view of a chloroplast showing the different parts
70 S ribosomes are found in prokaryotes, 
bacteria and blue green algae. The 70 S ribosomes have 2 subunits, 
., 50 S and 30 S. The ribosomes of mitochondria are small
., 55-60 S type, which are comparable to 70 S than 80 S type.
bacteria and blue green algae. The 70 S ribosomes have 2 subunits, ., 50 S and 30 S. The ribosomes of mitochondria are small., 55-60 S type, which are comparable to 70 S than 80 S type.Identify A to F in the sectional view of a chloroplast showing the different parts
biologyGeneral
70 S ribosomes are found in prokaryotes, bacteria and blue green algae. The 70 S ribosomes have 2 subunits, ., 50 S and 30 S. The ribosomes of mitochondria are small., 55-60 S type, which are comparable to 70 S than 80 S type.
bacteria and blue green algae. The 70 S ribosomes have 2 subunits, ., 50 S and 30 S. The ribosomes of mitochondria are small., 55-60 S type, which are comparable to 70 S than 80 S type.biology
Organelle important in spindle formation during nuclear division is
DNA multiplication or duplication of DNA takes place by replication. It takes place during S-phase of interphase in cell-cycle
Organelle important in spindle formation during nuclear division is
biologyGeneral
DNA multiplication or duplication of DNA takes place by replication. It takes place during S-phase of interphase in cell-cycle
biology
A widely accepted, improved model of cell membrane is
The ability to distinguish different neighbouring cells is important for organism’s function
Glycolipids are lipids with attached carbohydrate, which acts as recognition sites during cell-cell interaction, as well as sites of attachment in a tissue
Glycoproteins are often integral membrane proteins and are also important for cell recognition
Glycolipids are lipids with attached carbohydrate, which acts as recognition sites during cell-cell interaction, as well as sites of attachment in a tissue
Glycoproteins are often integral membrane proteins and are also important for cell recognition
A widely accepted, improved model of cell membrane is
biologyGeneral
The ability to distinguish different neighbouring cells is important for organism’s function
Glycolipids are lipids with attached carbohydrate, which acts as recognition sites during cell-cell interaction, as well as sites of attachment in a tissue
Glycoproteins are often integral membrane proteins and are also important for cell recognition
Glycolipids are lipids with attached carbohydrate, which acts as recognition sites during cell-cell interaction, as well as sites of attachment in a tissue
Glycoproteins are often integral membrane proteins and are also important for cell recognition
biology
Rough endoplasmic reticulum differs from smooth walled endoplasmic reticulum due to the presence of
In eukaryotes, DNA is tightly bound to histones which form a DNA protein particle called nucleosome
Rough endoplasmic reticulum differs from smooth walled endoplasmic reticulum due to the presence of
biologyGeneral
In eukaryotes, DNA is tightly bound to histones which form a DNA protein particle called nucleosome
biology
Middle lamella is present
Steps of Gram’s staining technique
(i) Staining with weak alkaline solution of crystal violet
(ii) Treatment with 0.5% iodine solution
(iii) Washing with water
(iv) Treatment with absolute alcohol/acetone
(i) Staining with weak alkaline solution of crystal violet
(ii) Treatment with 0.5% iodine solution
(iii) Washing with water
(iv) Treatment with absolute alcohol/acetone
Middle lamella is present
biologyGeneral
Steps of Gram’s staining technique
(i) Staining with weak alkaline solution of crystal violet
(ii) Treatment with 0.5% iodine solution
(iii) Washing with water
(iv) Treatment with absolute alcohol/acetone
(i) Staining with weak alkaline solution of crystal violet
(ii) Treatment with 0.5% iodine solution
(iii) Washing with water
(iv) Treatment with absolute alcohol/acetone
biology
A are granular structures first observed under electron microscope as dense particles by …B… (1953). Here, A and B refer to
J D Watson and F H C Crick (1953) showed that DNA has a double helical structure with two polynucleotide chains connected by hydrogen bonds and running in opposite directions (antiparallel). The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole).
A are granular structures first observed under electron microscope as dense particles by …B… (1953). Here, A and B refer to
biologyGeneral
J D Watson and F H C Crick (1953) showed that DNA has a double helical structure with two polynucleotide chains connected by hydrogen bonds and running in opposite directions (antiparallel). The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole).
biology
Number of protofilament in microtubule is
In a DNA molecule, a complete line measures 
with a distance of 
between two successive base pairs.
with a distance of between two successive base pairs.Number of protofilament in microtubule is
biologyGeneral
In a DNA molecule, a complete line measures with a distance of between two successive base pairs.
with a distance of between two successive base pairs.biology
Ribosomes that occur exclusively in mitochondria is
In prokaryotes, a nucleus is absent but nucleoid is found which is equivalent to a single chromosome or prochromosome
Ribosomes that occur exclusively in mitochondria is
biologyGeneral
In prokaryotes, a nucleus is absent but nucleoid is found which is equivalent to a single chromosome or prochromosome
physics-
The instantaneous velocity of a point 
of the given rod of length 0.5 m is 3 
in the represented direction. The angular velocity of the rod for minimum velocity of end A is
If rod is rotated about end 
, then vertical component of velocity 
of end will be zero.
, then vertical component of velocity of end will be zero.The instantaneous velocity of a point of the given rod of length 0.5 m is 3 in the represented direction. The angular velocity of the rod for minimum velocity of end A is
physics-General
If rod is rotated about end , then vertical component of velocity of end will be zero.
, then vertical component of velocity of end will be zero.physics-
A 
shaped object with dimension shown in the figure, is lying on a smooth floor. A force 
is applied at the point 
parallel to 
, such that the object has only the translational motion without rotation. Find the location of with respect to 
.
For translator motion the force should be applied on the centre of mass of the body so we have to calculate the location of centre of mass of shaped object.
Let mass of rod is 
so the mass of rod 
will be 2.
Let
is the centre of mass of rod and 
is the centre of mass of rod . We can consider that whole mass of the rod is placed at their respective centre of mass 
, mass is placed at and mass 
is placed at .
Taking point
at the origin position vector of points 
can be written as
and
Position vector of centre of mass of the system
shaped object.Let mass of rod
is so the mass of rod will be 2.Let
is the centre of mass of rod and is the centre of mass of rod . We can consider that whole mass of the rod is placed at their respective centre of mass , mass is placed at and mass is placed at .Taking point
at the origin position vector of points can be written asand
Position vector of centre of mass of the system
A shaped object with dimension shown in the figure, is lying on a smooth floor. A force is applied at the point parallel to , such that the object has only the translational motion without rotation. Find the location of with respect to .
physics-General
For translator motion the force should be applied on the centre of mass of the body so we have to calculate the location of centre of mass of shaped object.
Let mass of rod is so the mass of rod will be 2.
Let is the centre of mass of rod and is the centre of mass of rod . We can consider that whole mass of the rod is placed at their respective centre of mass , mass is placed at and mass is placed at .
Taking point at the origin position vector of points can be written as
and
Position vector of centre of mass of the system
shaped object.Let mass of rod
is so the mass of rod will be 2.Let
is the centre of mass of rod and is the centre of mass of rod . We can consider that whole mass of the rod is placed at their respective centre of mass , mass is placed at and mass is placed at .Taking point
at the origin position vector of points can be written asand
Position vector of centre of mass of the system
physics-
Two balls each of mass are placed on the vertices and of an equilateral triangle 
of side 1m. A ball of mass 2 is placed at vertex . The centre of mass of this system from vertex (located at origin) is
The centre of mass is given by
m
Centre of mass is 
.
m Centre of mass is .Two balls each of mass are placed on the vertices and of an equilateral triangle of side 1m. A ball of mass 2 is placed at vertex . The centre of mass of this system from vertex (located at origin) is
physics-General
The centre of mass is given by
m
Centre of mass is .
m Centre of mass is .physics-
Three identical spheres, each of mass 1 kg are kept as shown in figure below, touching each other, with their centers on a straight line. If their centres are marked ,
, 
respectively, the distance of centre of mass of the system from is
) 
Distance of centre of mass from is
Distance of centre of mass from
isThree identical spheres, each of mass 1 kg are kept as shown in figure below, touching each other, with their centers on a straight line. If their centres are marked ,, respectively, the distance of centre of mass of the system from is
physics-General
)
Distance of centre of mass from is
Distance of centre of mass from
isphysics-
From a circular disc of radius 
and mass 9 
, a small disc of radius /3 is removed from the disc. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through 
is
or
(i)Here,
Substituting in Eq. (i), we have
From a circular disc of radius and mass 9 , a small disc of radius /3 is removed from the disc. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through is
physics-General
or
(i)Here,
Substituting in Eq. (i), we have
chemistry-
WhatweightofHNO3isneededtoconvert 62gmofP4 inH3PO4 in the reaction? P4 +HNO3 →H3PO4 +NO2 +H2O
WhatweightofHNO3isneededtoconvert 62gmofP4 inH3PO4 in the reaction? P4 +HNO3 →H3PO4 +NO2 +H2O
chemistry-General