
For a gas P-V curve is given as shown in the diagram. Curve path follows equations \((V - 2)^2 = 4aP\). Find work done by gas in given cyclic process. 
How many tripeptides are possible when following three amino acids make tripeptide? (No amino acid should repeat twice)
(A) Glycine
(B) Alanine
(C) Valine
Such a group of atoms is called a molecule. Obviously, there must be some force that holds these constituent atoms together in the molecules. The attractive force which holds various constituents (atoms, ions, etc.) together in different chemical species is called a chemical bond.
There are 4 types of chemical bonds which are formed by atoms or molecules to yield compounds.