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A colour blind girl is rare because she will be born only when 
(1) Her mother and maternal grand father were colour blind
(2) Her father and maternal grand father were colour blind
(3) Her mother is colour blind and father has normal vision
(4) Parents have normal vision but grand parents were colour blind. 

In eukaryotes which of the following is removed from initially transcribed RNA before it is transported to the cytoplasm for translation ?
(1) Intron
(2) 3' Poly A tail
(3) Ribosome binding site
(4) 5' cap

The process of splicing in eukaryotes :
(1) is reminiscent of antiquity 
(2) represents dominance of RNA world
(3) is an indicator of the complexity of human genome
(4) is a legacy of organic evolution

In prokaryotes, the predominant site for control of gene expression is the  :
(1) transcription initiation 
(2) processing level
(3) transport of mRNA 
(4) translation level

In Hershey and Chase experiment, what finding led to the conclusion that DNA is the genetic material ?
(1) The presence of radioactivity in the bacteria when 35S was used.
(2) The presence of radioactivity in the supernatant when 35S was used.
(3) The presence of radioactivity in the bacteria when 32P was used.
(4) The presence of radioactivity in the supernatant when 32P was used.

Which of the following important biochemical reactions in living systems is catalyzed by a ribozyme?
1. Repair of DNA
2. Electron transport chain
3. Formation of peptide bond
4. Organization of MTOC during cell division

VNTR are useful in DNA profiling because they:
I. Are hypervariable
II. Are inherited
III. Synthesize constitutive enzymes
(1) I, II, III are correct
(2) I and II are correct
(3) I and III are correct
(4) II and III are correct   

The ultimate source of allelic variations is:
1. Genetic recombinations 
2. Mutation 
3. Genetic drift 
4. Natural selection 

The best plant explant to raise virus free plant is:
1. embryo
2. vessels
3. meristem
4. Leaf

What step actually brings about the improvement in the crop?
1. selection
2. germplasm collection
3. mutation breeding
4. Hybridization

Amongst the following species that have an atom in (+6) oxidation state is-
1. Mn${\mathrm{O}}_4^{-}$
2. Cr$(\mathrm{CN}{)}_6^{3-}$
3. Ni${\mathrm{F}}_6^{2-}$
4. CrO₂Cl₂

Which of the following is the strongest nucleophile?
1. Br^-         
2. OH^-
3. CN^-        
4. CH₃O^-

Aniline is a weaker base than ethylamine. This is due to
1. -I effect of ${\mathrm{NH}}_2$ in aniline
2. -R effect of ${\mathrm{NH}}_2$ in aniline
3. +I effect of ${\mathrm{NH}}_2$ in aniline
4. +R effect of ${\mathrm{NH}}_2$ in aniline

A projectile is fired at angle $\mathrm{\theta }$ with horizontal with initial speed u. If it breaks into two halves such that one half retraces its path, then the distance of hitting point of the other half from starting point is
1. $\frac{{\mathrm{u}}^2\sin 2\mathrm{\theta }}{\mathrm{g}}$
2. $\frac{2{\mathrm{u}}^2\sin 2\mathrm{\theta }}{\mathrm{g}}$
3. $\frac{{\mathrm{u}}^2\sin 2\mathrm{\theta }}{2\mathrm{g}}$
4. $\frac{{\mathrm{u}}^2\mathrm{sin\theta }}{2\mathrm{g}}$

The value of M, as shown, for which the rod will be in equilibrium is (rod is massless)

1.  1 kg
2.  2 kg
3.  4 kg
4.  6 kg

The minimum coefficient of friction for a solid sphere to roll without slipping on an inclined plane of inclination 45$°$ is
1.  2/7
2.  1/3
3.  1/2
4.  2/5

A wheel is rolling along a horizontal ground with a speed o 10 m/s. The magnitude of the velocity of the points at the extremities of the horizontal diameter of the wheel is equal to
1. $2\sqrt{10} m/s$
2. 10 m/s
3. $\sqrt{10} m/s$
4. $10\sqrt{2} m/s$

The change in gravitational potential energy when a body of mass m is raised to a height nR from the earth's surface is (R = radius of the earth)
1. $\mathrm{mgR}\frac{\mathrm{n}}{\mathrm{n}+1}$
2. $\mathrm{mgR}\frac{\mathrm{n}}{\mathrm{n}-1}$
3. nmgR
4. $\mathrm{mgR}\frac{{\mathrm{n}}^2}{{\mathrm{n}}^2+1}$
 

The element among the following that does not show inert pair effect is-

The number of sigma bonds in P₄O₁₀ is 
1. 6
2. 16
3. 20
4. 7