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Video Biología
"RNA Structure is a single strand composed of nucleotides. Unlike DNA it does not form a double helix shape, but it does contain a series of nitrogenous bases (adenine, uracil, guanine and cytosine). ...
"Ecological pyramids are diagrams which show the abundance of organisms at each trophic level along the food chain of an ecosystem. The shapes of ecological pyramids are somewhat triangular in ...
Video Biología
"The intake of oxygen into the lungs and producing carbon dioxide in return is the main function of the respiratory system. The respiratory system includes airways, lungs and respiratory muscles. When ...
Video Biología
"DNA structure is what is called a double helix. DNA consists of two strands of nuclotides connected by pairs of bases. These strands "point" in opposite directions and are twisted into a helix shape. ...
Video Biología
"Immediately before cell division, DNA copies itself in a process called DNA replication. First, an enzyme called helicase "unzips" the two strands in the double helix. Then DNA polymerase adds new nu ...
Video Biología
"The reproductive system is a group of organs responsible for reproduction. The organs and gametes of the reproductive system differs between genders- female gametes are called eggs and male gametes a ...
"Reproductive isolation is a mechanism that keeps species from mating with others. Prezygotic isolation prevents the fertilization of eggs while postzygotic isolation prevents the formation of fertile ...
Video Biología
"Divergent evolution occurs when related species develop unique traits due to different environments or selective pressures. A classic example of divergent evolution is the Galapagos finch which Darwi ...
Video Biología
"The digestive system controls the chemical and mechanical breaking down of food into molecules that can be used throughout the body. It includes organs such as the esophagus, stomach, and small and l ...
"The cytoskeleton provides structure within a cell. It is found in all cells and is important for cellular motion (using structures such as flagella and cilia) and intracellular transport. Cytoplasm i ...
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