structures and function in living systems

The functions performed by the circulatory system in all animals are 1) Transport of nutrients like glucose, amino acids, vitamins, minerals 2) Transport of oxygen from the organs of respiration to the body cells. 3) Transport of carbon dioxide from the body cells to the exterio..

It controls and coordinates all the activities of the muscles in response to the changes outsid..

The structure of the functional groups in acyl halide, acid anhydride, ester and amide are similar to that of the carboxyl group. Due to the presence of lone pairs of electrons at the halogen, oxygen and nitrogen atoms, resonance is possible in these derivatives just like that i..

1. It can take part in electron transport system in both respiration and photosynthesis. 2. In photosynthesis the copper containing enzyme is plastocyanin. 3. It is the connecting link between photo system - I and ..

i) The pelvic girdles join to form bowl like structure and the wide space enclosed between them forms the pelvis which support and protect the abdominal organs. ii) The pelvic girdles of female are more flexible, broader and shallower than those of male, this is an adaptation for pregnan..

The nervous system carries out the following functions i) It perceives the changes around us through our senses. ii) It controls and coordinates all the activities of the muscles in response to the changes outside. iii) It also maintains the internal environment of the body by ..

Amino acids are the building blocks of proteins. There are 300 amino acids that occur in nature. Among these only 20 are known as standard amino acids that commonly occur in proteins. Amino acids contain two functional groups. They are - amino and carboxyl groups. The amino group (-NH 2 )..

After taking into account account the above observed facts, Kekule (1865) suggested a ring structure for benzene. According to him, six carbon atoms occupied six corners of a regular hexagon in benzene and each carbon carried one hydrogen atom. To satisfy the tetravalency of carbon, the ..

Structural Organization of the Cell..

The aldehydes and ketones have carbonyl group as the functional group. The carbonyl carbon sp 2 hybridized and thus has three sp 2 hybrid orbitals and one unhybridized p-orbital. It uses sp 2 hybrid orbitals to form three s -bonds one with oxygen atom and remaining two with two ..