Questions

In cancer cells, there is breakdown of these regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancer cells appears to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant.

Polarity :: 

The polarity of a molecule defines its other physical properties such as melting point, boiling point, surface tension, vapor pressure etc... Simply, polarity occurs when the electron distribution in a molecule is asymmetric. This results in a net dipole moment in the molecule. One end of the molecule is charged negative while the other gets a positive charge.

The polarization of a molecule greatly depends on the shape of the molecule. A diatomic molecule like HF mentioned above has no issue of shape. The net dipole moment is only due to the uneven distribution of electrons between the two atoms. However, when there are more than two atoms involved in making a bond, there are many complexities.

The water molecule is of bent shape. Therefore, when the two pair of electrons shared by oxygen with two hydrogen atoms is pulled towards oxygen, the net dipole moment results in the direction of the oxygen atom. There is no other force to cancel out the resultant dipole moment. Hence, the water molecule is highly polar.

Ammonia molecule is of a pyramid shape and the electronegative N atom pulls the electrons towards itself. The three N-H bonds are not in the same plane; hence the dipole moments created do not get canceled out. This makes ammonia a polar molecule.

However, the dipole moments sometimes get canceled due to the shape of the molecules, making the molecule non-polar. Carbon dioxide is such a molecule.

Enid Mary Blyton was the English children's writer published 59 new books in 1955.

Strait of Messina seperates Italy and Sicily , while Strait of Bonifacio is located between Corsica  and Sardinia and Strait of Otranto  is found between Italy and Albania.

Indian Army Day is celebrated every year all over the country on 15th January.

I. Inputs

• Enterprise environmental factors


• Organizational process assets


• Project scope statement


• Work breakdown structure


• WBS dictionary


• Project management plan

                 - Risk register

                 - Risk - related contractual agreements

                 - Resource requirements

                 - Project schedule

                 - Activity cost estimates

                 - Cost baseline

II. Tools and Techniques

• Make-or-buy analysis


• Expert judgement


• Contract types

III. Outputs

• Procurement management plan


• contract statement of work


• make-or-buy decisions


• Requested changes