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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 ...
"Ribosomes are responsible for synthesizing proteins and forming amino acids. This process is also known as translation and occurs after DNA replication and transcription. Ribosomes read as they move ...
Hipervinculo Biología
"Because DNA is unique to an individual, we can use DNA fingerprinting to match genetic information with the person it came from. The restriction fragment length polymorphism technique (RFLP) "cuts" o ...
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 ...
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