ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..
Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..
Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..
A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..
Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...
This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..