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Stem
Stems

Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

Ploidy
Mutation Frequency and Polyploidy

Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howev..

kinesin motor proteins transporting molecules across microtubules
Movement of Molecules Across Cell Membranes

Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..

Bryophytes
Bryophytes

Bryophytes are a plant group characterized by being nonvascular. They include the mosses, the liverworts, and the hornwo..

Human Reproduction
Human Reproduction

Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..

Darwin's Finches - Natural Selection
Darwin’s Finches & Natural Selection

Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..