VD - 4/05/2014

Many of the intermediate products of respiration of plants are substrates, or synthesis pathways energy source for many other products. a) The hexoses provide carbon skeleton for synthesis of products which are used in the formation of the cell...

VD - 27/04/2014

It is documented that some animal species have disappeared or are threatened with extinction when, as a result of geological change, it has reduced or eliminated it source of plant food. If we look at trophic pyramid we can see that there are very few...

VD - 20/04/2014

The endosymbiosis hypothesis suggests that early free prokaryotes were mitochondria for several reasons: (a) Not all eukaryotes have chloroplasts (b) Mitochondria have their own DNA (c) Mitochondria only come from other mitochondria (d) The...

VD - 6/04/2014

The chloroplasts that at one point of evolution, 3800 million years ago, were primitive free cells, are individually evolution was transmitted to the rest of the cells derived from them. Reproduction of chloroplasts is bipartition and doubling its...

VD - 30/03/2014

Taking into account the information from previous chapters, we found that 3,800 million years ago there were few unicellular organisms that for 700 million years enriched the seas and the atmosphere with oxygen. Simultaneously they produced organic...

VD - 16/03/2014

Four geological facts help us to mark the Earth life development calendar.