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"A virus is a nucleic acid encased in a protein shell and is inactive except within a host cell. Viruses penetrate host cells and inject their genetic information in the form of DNA or RNA. In the lit ...
Hipervinculo Biología
"Vesicles and vacuoles are sacs used for storage inside eukaryotic cells. Plant cells have a single vacuole which is generally the largest organelle inside the cell. In animal cells, there are several ...
Video Biología
"The citric acid cycle, also known as the Krebs cycle, is involved in cell respiration and produces NADH and FADH2 for the electron transport chain. The Krebs cycle also produces two ATP, but much mor ...
"A keystone species is a species which maintains the balance and diversity of its community. Often keystone species are predators which check the population of other species that might otherwise beco ...
Hipervinculo Biología
"Karyotypes are images which depict individual chromosomes. Karyotes are used by scientists to study chromosomal regulation and evolutionary events in living things. Scientists are able to study the n ...
Video Biología
"The integumentary system is comprised of skin, hair, scales, feathers and nails. The integumentary system protects the body from physical damage and it is the largest organ system, mostly due to the ...
Hipervinculo Biología
"Tissues and organs are the basic structural units of our bodies. Tissues are collections of cells which serve the same function while organs are collections of tissues. Organ systems are composed of ...
Hipervinculo Ciencias de la Tierra y Medioambiente
"The water cycle tracks the movement of water as it progresses through the states of matter and travels through the biosphere. Most of the water on earth is found in its oceans, but when the surfac ...
Video Biología
"The immune system protects the body from diseases. It detects and kills things like viruses and bacteria to prevent sickness and to allow the body to continue to function properly. There are three li ...
Hipervinculo Biología
"A hydrogen bond is an extremely strong bond between molecules with a Hydrogen atom bonded to a Fluorine, Oxygen or Nitrogen atom and a molecule with a Fluorine, Oxygen or Nitrogen atom. Hydrogen bond ...
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