An open container has net 10 gm mass of a radioactive material. The net mass in the container after two mean lives is approximately:

1) 1.35 gm
2) 2.5 gm
3) 10 gm
4) 5 gm

 Repititive DNA is not met with in

(1)     Yeast                    (2)     Prokaryotes

(3)     Both (1) and (2)      (4)     Eukaryotes

In a eukaryotic cell which of the following RNA undergoes translation ?
1. r-RNA
2. t-RNA
3. m-RNA
4. all these three types

It acts as a shock absorber when long bones come together.

1) Ligament
2) Tendon
3) Cartilage
4) Basement membrane

Which of the following tissues exercises most control of root pressure?

 1) Cortex
 2) Endodermis
 3)  Phloem
 4) Xylem

Medulla oblongata contains
 1) I Ventricle
 2) II Ventricle
 3) III Ventricle
 4) IV Ventricle

The synthesis of m RNA by DNA is called

 (1) Chain termination
 (2) Transcription
 (3) Translocation
 (4) Translation

 Typical vertebrae of frog are from :

 1. 1-7
 2. 3-7
 3. 2-8
 4. 2-9

Number of genera of Ehphorbiaceae found in South India
 1) 59
 2) 65
 3) 57
 4) 20

A vertical closed cylinder is separated into two parts by a frictionless piston of mass m and of negligible thickness. The piston is free to move along the length of the cylinder. The length of the  cylinder above the piston is ?1, and that below the piston is ?2 , such that ?1 > ?2 . Each part of the cylinder contains n moles of an ideal gas at equal temperature T. If the piston is stationary, its mass, mm, will be given by :

(R is universal gas constant and g is the acceleration due to gravity)

1) $$\dfrac{nRT}{g} \left[\dfrac{1}{\ell_2} + \dfrac{1}{\ell_1}\right]$$
2) $$\dfrac{nRT}{g} \left[\dfrac{\ell_1 - \ell_2}{\ell_1\ell_2} \right]$$
3) $$\dfrac{RT}{g} \left[\dfrac{2\ell_1 + \ell_2}{\ell_1\ell_2} \right]$$
4) $$\dfrac{RT}{g} \left[\dfrac{\ell_1 - 3\ell_2}{\ell_1\ell_2} \right]$$