mechanical
Digestion - breaking down food into simpler forms. Digestion is both and chemical . The digestion may take place outside cells ( extracellular ) or within the cells ( intracellular ). Absorption - Taking in of food in the soluble forms into the tissues. The absorption may be passive (without ..
Transport Mechanisms
Introduction - Transportation whether in plants or animals is the key to the efficient assimilation of the nutrients that the organisms synthesise, get from their environment or digest. The study of these processes helps us in many ways. The study of transport mechanisms in plants helps u..
Quantum Mechanical Model of the Atom
Quantum Mechanical Model of the Atom - Two new theories came to substantially modify Bohr's Atomic model. They a..
Mechanism of DNA Replication
It is a complex process and involves the participation of over a dozen enzymes and other protein factors. The intertwined DNA starts separating from a particular point and this is known as the origin of replication. The second step is that the two strands of DNA separate, before each serves as a te..
Probability Picture of Electrons and Concept of Atomic Orbital (Wave Mechanical Treatment)
The wave character of an electron and uncertainty in its position and momentum gave a serious blow to Bohr's model of an atom. According to Bohr, the electrons revolve around the nucleus in certain well-defined circular orbits. But the idea of uncertainty in position and velocity overruled the Bohr..
Experiment to prove Semi-Conservative Mechanism of DNA Replication
The semi conservative DNA replication was confirmed by an elegant experiment conducted by M. Meselson and F. W. Stahl in 1958. They grew the bacterium Escherichia coli in a medium containing nitrogen salts labeled with the stable heavy isotope 1 5 N. 1 5 N was incorporated into both strands of..
Mendelian Genetics
The biggest name in the entire history of genetics beyond any doubt is that of Gregor Johann Mendel (1822-1884). It was Mendel, more than any other scientist, who synthesized the basic principles of heredity into a body of knowledge that has formed the very core of modern genetics. It must be empha..
Isolation
Isolation is the segregation or separation of populations by certain barriers, which prevent interbreeding. As a result gene flow between populations is prevented. Each population on isolation, develops genetic divergence independently leading to the formation of new species. The factor w..
Isolation
Isolation - Isolation is the segregation or separation of populations by certain barriers, which prevent interbreeding. As a result gene flow between populations is prevented. Each population on isolation, develops genetic divergence independently leading to the formation of new species. ..
What is Physics?
What is Physics? - The word 'Physics' comes from the Greek word 'phusis' meaning 'nature', introduced by the ancient scientist 'Aristotle'. Man has always been fascinated by nature. So, he questioned and sought answers for every phenomena nature could offer. The branch of science which is devoted t..
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