Cancer is a collective name for many different diseases caused by a common mechanism: uncontrolled cell division. In cancer cells, mutations modify the control of the cell cycle and cells don’t stop growing as they normally would.…
Cancer and the cell cycle Read More »
No one knows exactly when viruses emerged or from where they came, since viruses do not leave historical footprints such as fossils.…
Part 9: Viruses and the diseases they cause Read More »
The nucleic acids DNA and RNA are key macromolecules in the continuity of life. They carry the genetic blueprint of a cell and carry instructions for the functioning of the cell.…
Part 5: The nucleic acids DNA and RNA Read More »
The individual sexually reproducing organism – including humans – begins life as a fertilized egg, or zygote. Trillions of cell divisions subsequently occur in a controlled manner to produce a complex, multicellular organism like, for instance, the human organism.…
Part 4: Reproduction at cellular level Read More »
The cell membrane or plasma membrane has many functions, but the most basic one is to define the cell’s borders and keep the cell functional.…
Part 3: Structure and function of plasma membrane Read More »
Living things are highly organized and structured, following a hierarchy on a scale from small to large.
Part 2: About the cellular level of organization of living things Read More »