Portal:Biology
Introduction
Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. For instance, all organisms are made up of cells that process hereditary information encoded in genes, which can be transmitted to future generations. Another major theme is evolution, which explains the unity and diversity of life. Energy processing is also important to life as it allows organisms to move, grow, and reproduce. Finally, all organisms are able to regulate their own internal environments.
Biologists are able to study life at multiple levels of organization, from the molecular biology of a cell to the anatomy and physiology of plants and animals, and evolution of populations. Hence, there are multiple subdisciplines within biology, each defined by the nature of their research questions and the tools that they use. Like other scientists, biologists use the scientific method to make observations, pose questions, generate hypotheses, perform experiments, and form conclusions about the world around them.
Life on Earth, which emerged more than 3.7 billion years ago, is immensely diverse. Biologists have sought to study and classify the various forms of life, from prokaryotic organisms such as archaea and bacteria to eukaryotic organisms such as protists, fungi, plants, and animals. These various organisms contribute to the biodiversity of an ecosystem, where they play specialized roles in the cycling of nutrients and energy through their biophysical environment. (Full article...)
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The genetic code is the set of rules used by living cells to translate information encoded within genetic material (DNA or RNA sequences of nucleotide triplets, or codons) into proteins. Translation is accomplished by the ribosome, which links proteinogenic amino acids in an order specified by messenger RNA (mRNA), using transfer RNA (tRNA) molecules to carry amino acids and to read the mRNA three nucleotides at a time. The genetic code is highly similar among all organisms and can be expressed in a simple table with 64 entries.
The codons specify which amino acid will be added next during protein biosynthesis. With some exceptions, a three-nucleotide codon in a nucleic acid sequence specifies a single amino acid. The vast majority of genes are encoded with a single scheme (see the RNA codon table). That scheme is often referred to as the canonical or standard genetic code, or simply the genetic code, though variant codes (such as in mitochondria) exist. (Full article...)Selected picture -
The griffon vulture (Gyps fulvus) is a large Old World vulture in the bird of prey family Accipitridae. It is also known as the Eurasian griffon.
Major topics
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Nina Petrovna Demme (Russian: Нина Петровна Демме, 1902 – 16 March 1977) was a Soviet polar explorer, biologist, and ornithologist. She was one of the first women to explore the Arctic and have charge of a polar expedition. Raised in an polyamorous household in Kostroma, she attended the first women's gymnasium in Russia from 1907 to 1914 and then studied to become a teacher. After taking workers courses under Lenin's wife Nadezhda Krupskaya, she taught collectivism in the Ufa Governorate before settling in Leningrad in 1921 to study at the Geographical Institute. For eight years, she studied geography and biology, participating in numerous field trips on polar research.
Graduating in 1929, Demme went to work at the Arctic and Antarctic Research Institute and participated in a two-year expedition to Franz Josef Land, during which she was the only woman in the group. Chosen to lead an expedition to Severnaya Zemlya, known then as the Kamenev Islands, she and her team of three men mapped the western part of the archipelago and conducted research on the plants and animals. Returning to Leningrad in 1934, she researched the commercial collective farming potential of animals of the north and for several seasons studied black foxes and the possibilities of breeding eiders. Earning her Candidate's Degree in biology in 1946, she became a professor but was discontent to remain in the classroom and continued to make research trips until she retired in 1959. In her retirement, she painted, and planted a large garden of flowers and trees, which she maintained until her death in 1977. (Full article...)General images -
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In Micrographia, Robert Hooke had applied the word cell to biological structures such as this piece of cork, but it was not until the 19th century that scientists considered cells the universal basis of life. (from History of biology) -
Description of rare animals (写生珍禽图), by Huang Quan (903–965) during the Song dynasty. (from History of biology) -
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Summary of 2006 IUCN Red List categories: EX (Extinct) — EW (Extinct in the Wild) — CR (Critically Endangered) — EN (Endangered) — VU (Vulnerable) — NT (Near Threatened) — LC (Least Concern) (from Conservation biology) -
Statue of Robert Koch in Berlin. Koch directly provided proof for the germ theory of diseases, therefore creating the scientific basis of public health, saving millions of lives. For his life's work Koch is seen as one of the founders of modern medicine. (from History of biology) -
Inside of a 48-well thermal cycler, a device used to perform polymerase chain reaction on many samples at once (from History of biology) -
More conservation research is needed for understanding ecology and behaviour of the dhole in central China. (from Conservation biology) -
Mendelian inheritance states characteristics are discrete and are inherited by the parents. This image depicts a monohybrid cross and shows 3 generations: P1 generation (1), F1 generation (2), and F2 generation (3). Each organism inherits two alleles, one from each parent, that make up the genotype. The observed characteristic, the phenotype, is determined by the dominant allele in the genotype. In this monohybrid cross the dominant allele encodes for the colour red and the recessive allele encodes for the colour white. (from History of genetics) -
Gregor Mendel, "father of modern genetics". (from History of biology) -
Innovative laboratory glassware and experimental methods developed by Louis Pasteur and other biologists contributed to the young field of bacteriology in the late 19th century. (from History of biology) -
Clay models of animal livers dating between the nineteenth and eighteenth centuries BCE, found in the royal palace at Mari (from History of biology) -
2016 conservation indicator which includes the following indicators: marine protected areas, terrestrial biome protection (global and national), and species protection (global and national) (from Conservation biology) -
The frontispiece to Erasmus Darwin's evolution-themed poem The Temple of Nature shows a goddess pulling back the veil from nature (in the person of Artemis). Allegory and metaphor have often played an important role in the history of biology. (from History of biology) -
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Aristotle's model of transmission of movements from parents to child, and of form from the father. The model is not fully symmetric. (from History of genetics) -
In the course of his travels, Alexander von Humboldt mapped the distribution of plants across landscapes and recorded a variety of physical conditions such as pressure and temperature. (from History of biology) -
Synthetic insulin crystals synthesized using recombinant DNA technology (from History of biotechnology) -
Wendell Stanley's crystallization of tobacco mosaic virus as a pure nucleoprotein in 1935 convinced many scientists that heredity might be explained purely through physics and chemistry. (from History of biology) -
A Genentech-sponsored sign declaring South San Francisco to be "The Birthplace of Biotechnology." (from History of biotechnology) -
Efforts are made to preserve the natural characteristics of Hopetoun Falls, Australia, without affecting visitors' access. (from Conservation biology) -
Frontispiece to a 1644 version of the expanded and illustrated edition of Historia Plantarum, originally written by Theophrastus around 300 BC (from History of biology) -
An art scape image showing the relative importance of animals in a rain forest through a summary of (a) child's perception compared with (b) a scientific estimate of the importance. The size of the animal represents its importance. The child's mental image places importance on big cats, birds, butterflies, and then reptiles versus the actual dominance of social insects (such as ants). (from Conservation biology) -
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Thomas Hunt Morgan discovered sex linked inheritance of the white eyed mutation in the fruit fly Drosophila in 1910, implying the gene was on the sex chromosome. (from History of genetics) -
De arte venandi, by Frederick II, Holy Roman Emperor, was an influential medieval natural history text that explored bird morphology. (from History of biology) -
Carefully engineered strains of the bacterium Escherichia coli are crucial tools in biotechnology as well as many other biological fields. (from History of biology) -
Penicillin was viewed as a miracle drug that brought enormous profits and public expectations. (from History of biotechnology) -
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August Weismann's germ plasm theory. The hereditary material, the germ plasm, is confined to the gonads. Somatic cells (of the body) develop afresh in each generation from the germ plasm. (from History of genetics) -
Thomas Hunt Morgan's illustration of crossing over, part of the Mendelian-chromosome theory of heredity (from History of biology) -
The "central dogma of molecular biology" (originally a "dogma" only in jest) was proposed by Francis Crick in 1958. This is Crick's reconstruction of how he conceived of the central dogma at the time. The solid lines represent (as it seemed in 1958) known modes of information transfer, and the dashed lines represent postulated ones. (from History of biology) -
Brewing was an early example of biotechnology (from History of biotechnology) -
Charles Darwin's first sketch of an evolutionary tree from his First Notebook on Transmutation of Species (1837) (from History of biology) -
Blending Inheritance (from History of genetics) -
A pie chart image showing the relative biomass representation in a rain forest through a summary of children's perceptions from drawings and artwork (left), through a scientific estimate of actual biomass (middle), and by a measure of biodiversity (right). The biomass of social insects (middle) far outweighs the number of species (right). (from Conservation biology) -
Diagram of Charles Darwin's pangenesis theory. Every part of the body emits tiny particles, gemmules, which migrate to the gonads and contribute to the fertilised egg and so to the next generation. The theory implied that changes to the body during an organism's life would be inherited, as proposed in Lamarckism. (from History of genetics) -
Some biodiversity loss is more insidious than others due to systemic neglect. For example, sport killing and wanton waste of tons of native fishes from unregulated 21st century bowfishing in the United States. New conservation movements are needed to deter irreparable biodiversity loss to fragile freshwater ecosystems. (from Conservation biology) -
Cabinets of curiosities, such as that of Ole Worm, were centers of biological knowledge in the early modern period, bringing organisms from across the world together in one place. Before the Age of Exploration, naturalists had little idea of the sheer scale of biological diversity. (from History of biology) -
A biomedical work by Ibn al-Nafis, an early adherent of experimental dissection who discovered the pulmonary and coronary circulation (from History of biology)
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Did you know -
- ... that one of the smallest fish, the Philippine goby, can only grow between 1 and 1.5 cm?
- ...that the largest flower, Rafflesia has a very foul odor?
- ... that mesoporous silica nanoparticles are prepared by the Stöber process and are used in preparing biosensors and delivering medications to within cellular structures?
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