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Digestion and Absorption of Food
The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and then transferred to the internal environment by absorption. Find out more about these processes carried out by the gastrointestinal system through this tutorial...
Plant Cell Defense
Plants protect themselves by releasing hydrogen peroxide to fight against fungal invasion. Another way is by secreting compounds, such as lignin, ethylene, galls, and tannins. Find out how these mechanisms protect the plants from pathogens...
Adaptive Radiation
The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant adaptive zone is referred to as adaptive radiation. 'Darwin's Finches' exemplified adaptive radiation. For more elaborate info on adaptive radiation, read this tutorial...
Gene Action – Operon Hypothesis
This tutorial focuses on the way genes control and determine every aspect of the body. It describes lac operon as an example. It also gives an overview of the inborn error of metabolism...
Cell Biology
The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas others have many cells that are organized into tissues, organs, and systems. The scientific study of the cell is called cell biology. This field deals with the cell structure and function in detail. It covers..