How did Hershey and Chase differentiate between DNA and protein in their experiment while proving that DNA is the genetic material?
Depending upon the chemical nature of the template (DNA or RNA) and the nature of nucleic acids synthesised from it (DNA or RNA), list the types of nucleic acid polymerases.
Which property of DNA double helix led Watson and Crick to hypothesise semi- conservative mode of DNA replication? Explain.
If the sequence of the coding strand in a transcription unit is written as follows:
5′-ATGCATGCATGCATGCATGCATGCATGC-3′ Write down the sequence of mRNA.
If the sequence of one strand of DNA is written as follows:
5′-ATGCATGCATGCATGCATGCATGCATGC-3′
Write down the sequence of complementary strand in 5’→3′ direction
If a double stranded DNA has 20 per cent of cytosine, calculate the per cent of adenine in the DNA.
Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine.
The dimensions of radian per second are :
Taking density (p), velocity (v) and area (a) to be fundamental unit then the dimensions of force are:
Which of the following is not correct for dimensionless quantity?
If 
where v is velocity, t is time and A, B and C are constant then the dimentional formula of B :
Which of the following is dimensionally correct?
Which of the following physical quantities has neither dimensions nor unit?
Which of the following pairs have same dimensions?
A rock contains 0.257 mg of lead-206 for every mg of uranium-238. The half-life decay for uranium to turn into lead is 4.5x109 yr. How old is the rock?
If a watch contains a radioactive substance with a decay rate of 1.40*10-2 and after 50 years only 25 mg remain, calculate the amount originally present?
The half life of a specific element was calculated to be 5200 yr. What is the value of decay constant (k)?
What is radioactive or neuclear decay and how many types are there?
What is the fundamental physics involved in the formation of Alpha Particles that are emitted during Alpha Decays?
A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B constant in time and space, pointing perpendicular and into the plane at the loop exists everywhere with half the loop outside the field, as shown in figure. The induced emf is :
Formation of covalent bonds in compounds exhibits
Sodium and copper have work functions 2.3 eV and 4.5 eV respectively. Then the ratio of the wavelengths is nearest to?
At a specific instant emission of radioactive compound is deflected in a magnetic field. The compound can emit:
(i) electrons (ii) protons
(iii) He2+ (iv) neutrons
The emission at the instant can be :
Wires 1 and 2 carrying currents i1, and i2 respectively are inclined at an 
to each other. What is the force on a small element dl of wire 2 at a distance r from wire 1 (as shown in figure) due to the magnetic field of wire 1?
A particle of mass m moves along line PC with velocity v as shown.
What is the angular momentum of the particle about O?
One end of massless rope, which passes over a massless and frictionless pulley P is tied to a hook C while the other end is free. Maximum tension that the rope can bear is 360 N.
With what value of maximum safe acceleration (in ms-2) can a man of 60 kg climb on the rope?
Three identical blocks of masses m = 2 kg are drawn by a force F = 10.2 N with an acceleration of 0.6 ms-2 on a frictionless surface, then what is the tension (in N) in the string between the blocks B and C ?
Two spheres of the same material have radii 1 m and 4 m and temperatures 4000 K and 2000 K respectively. The ratio of the energy radiated per second by the first sphere to that by the second is
A light string passing over a smooth light pulley connects two blacks of masses m1 and m2 (vertically). If the acceleration of the system is g / S. then the ratio of the masses is :
Capacitance (in F) of a spherical conductor having radius 1 m, is
If a charge q is placed at the center of the line joining two equal charges Q such that the system is in equilibrium then the value of q is :
1 mole of a gas with 
is mixed with 1 mole of a gas with 
, then the value of 
for the resulting mixture is :
Speeds of two identical cars are u and 4 u at a specific instant. The ratio of the respective distances at which the two cars are stopped from that instant is :
Mention any two autosomal genetic disorders with their symptoms.
Who had proposed the chromosomal theory of inheritance?
What is point mutation? Give one example
Explain the following terms with example
(a) Co-dominance
(b) Incomplete dominance
A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.
How is sex determined in human beings?
What is pedigree analysis? Suggest how such an analysis, can be useful.
Two heterozygous parents are crossed. If the two loci are linked what would be the distribution of phenotypic features in F1 generation for a dihybrid cross?
When a cross in made between tall plants with yellow seeds (TtYy) and tall plant with
green seed (TtYy), what proportions of phenotype in the offspring could be expected to be
(a) Tall and green.
(b) Dwarf and green.
Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.
Define and design a test − cross?
Explain the Law of Dominance using a monohybrid cross.
A diploid organism is heterozygous for 4 loci, how many types of gametes can be
produced?
What is the difference between the Dominance and Recessive
Mention the advantages of selecting pea plant for experiment by Mendel.
Two forces are such that the sum of their magnitudes is 18 N and their resultant which has magnitude 12 N, is perpendicular to the smaller force. Then the magnitudes of the forces are :