Dictionary,Defintion,Meaning,What is Enzyme, Eukaryote, Eocene, Episome, Epistasis, Equilibrium Position, Erwin, Douglas, Escherichia Coli

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Home >> Genetics Dictionary >> Enzyme, Eukaryote

Your Ad Here	Enzyme A protein that acts as a catalyst, speeding the rate at which a biochemical reaction proceeds but not altering the direction or nature of the reaction. 2. A protein that facilitates a specific chemical reaction. Eocene The second oldest of the five major epochs of the Tertiary period, from 54 to 38 mya. It is often known for the rise of mammals
Environment Factors outside the human body. To a geneticist, the environment is everything that is not genetic. Some aspects of the environment that influence health and disease are listed below: Diet - food, preservatives, coloring, method of preparation (smoked foods, for example), composition of diet (fats, carbohydrates, protein), and amount. Air -- clean air, smog, pollution, tobacco, workplace chemical fumes, dust (coal, cotton, etc.), humidity, temperature. Water -- everything we drink, cook, or bathe in. Also, fluoride, pesticides, minerals. Radiation - sunlight, tanning lights, radiation (X rays, microwaves, radio waves). Infection - bacteria, viruses, fungi, parasites. Also includes infection-related factors, such as sanitation and proximity to people, animals, or insects
Enzyme A protein that acts as a catalyst, speeding the rate at which a biochemical reaction proceeds but not altering the direction or nature of the reaction. 2. A protein that facilitates a specific chemical reaction. Eocene The second oldest of the five major epochs of the Tertiary period, from 54 to 38 mya. It is often known for the rise of mammals. Episome A circular piece of DNA that can replicate independently of the bacterial chromosome or integrate and replicate as part of the chromosome. 2. A class of genetic elements; F factor is an example; compare with plasmid	Your Ad Here
Epistasis One gene interfers with or prevents the expression of another gene located at a different locus. 2. Interaction between non-allelic genes, such that one gene masks or interferes with expression of the other gene. 3. An interaction between the genes at two or more loci, such that the phenotype differs from at would be expected if the loci were expressed independently. 4. The nonreciprocal interaction of nonallelic genes; the situation .in which one gene masks the expression of another Equilibrium population A population in which the allelic frequencies of its gene pool do not change through successive generations.
Your Ad Here	Erwin, Douglas Dr. Erwin is a paleobiologist with the National Museum of Natural History in the Smithsonian Institution. His research is concerned with aspects of major evolutionary novelties, particularly the Metazoan radiation and post-mass extinction recoveries. Recent work has involved the developmental events associated with the Cambrian along with their environmental context. He also works on the rate, causes and consequences of the end-Permian mass extinction

Escherichia coli
Common bacterium that has been studied intensively by geneticists because of its small genome size, normal lack of pathogenicity, and ease of growth in the laboratory.
Euchromatin
Regions of chromatin that are relatively uncoiled during interphase. Euchromatin is thought to contain actively transcribed genes.
2. Regions of eukaryotic chromosomes that are diffuse during interphase; presumably the actively transcribing DNA of the chromosomes.

Eugenics
The study of improving a species by artificial selection; usually refers to the selective breeding of humans.
2. The science or practice of altering a population, especially of humans, by controlled breeding for desirable inherited characteristics. The term was coined in 1883 by Francis Galton, who was an advocate of "improving" the human race by modifying the fertility of different categories of people. Eugenics fell into disfavour after the perversion of its doctrines by the Nazis.

Eukaryote.
Cell or organism with membrane-bound, structurally discrete nucleus and other well-developed subcellular compartments. Eukaryotes include all organisms except viruses, bacteria, and blue green algae. See also: prokaryote, chromosome.
2. An organism whose cells have true nuclei and membranous organelles, and whose cells undergo mitosis and meiosis.
3. Any organism made up of eukaryotic cells. Eukaryotes are generally larger and have more DNA than prokaryotes (whose cells do not have a nucleus to contain their DNA). Almost all multicellular organisms are eukaryotes.
4. An organism with cells that contain true nuclei with nuclear membranes

Eukaryotic cell
A cell with a distinct nucleus

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